{"id":189,"date":"2026-06-11T09:04:18","date_gmt":"2026-06-11T09:04:18","guid":{"rendered":"https:\/\/planetary-gearboxes.cn\/?p=189"},"modified":"2026-06-11T09:04:18","modified_gmt":"2026-06-11T09:04:18","slug":"nyogel-792d-vs-castrol-lmx-planetary-gearbox-lubricant","status":"publish","type":"post","link":"https:\/\/planetary-gearboxes.cn\/ko\/nyogel-792d-vs-castrol-lmx-planetary-gearbox-lubricant\/","title":{"rendered":"NYOGEL 792D vs CASTROL LMX \u2014 Which Planetary Gearbox Lubricant for Your Application"},"content":{"rendered":"
\n
\n
\n
\u221240\u00b0C<\/div>\n
NYOGEL 792D Min Temp<\/div>\n<\/div>\n
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0\u00b0C<\/div>\n
CASTROL LMX Min Temp<\/div>\n<\/div>\n
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+125\u00b0C<\/div>\n
NYOGEL Max Continuous<\/div>\n<\/div>\n
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+90\u00b0C<\/div>\n
CASTROL LMX Max Continuous<\/div>\n<\/div>\n
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ISO 5<\/div>\n
NYOGEL Cleanroom Class<\/div>\n<\/div>\n
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\ubc00\ubd09\ub428<\/div>\n
Lifetime Fill \u2014 Both Greases<\/div>\n<\/div>\n<\/div>\n<\/div>\n

<\/p>\n

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\n

Engineering Context<\/span><\/p>\n

Lubricant Is a Hidden Specification \u2014 Why the Grease Inside Your Gearbox Matters More Than Most Engineers Realise<\/h2>\n
\n
\"EP-FAD<\/p>\n

The sealed lubrication chamber of an EP-FAD gearbox contains NYOGEL 792D synthetic grease as a lifetime fill. The grease cannot be changed in the field \u2014 the sealed housing is the engineering guarantee that the specified grease remains in the gear mesh and bearings for the full 30,000-hour design life without contamination or replenishment.<\/p>\n<\/div>\n

When a machine designer selects an EP-FAD gearbox, they are implicitly also selecting NYOGEL 792D as the lubricant for the life of that gearbox. When they select EP-FPG, they are selecting CASTROL LMX. These two greases have meaningfully different properties \u2014 a 40\u00b0C gap in minimum operating temperature, a 35\u00b0C gap in maximum continuous operating temperature, different chemical resistance profiles, and different cleanroom particle emission characteristics. In the right application, either grease is excellent. In the wrong application, the mismatch between the gearbox’s installed lubricant and the deployment environment is a failure that cannot be corrected without replacing the sealed gearbox unit.<\/p>\n

This guide explains what both greases are, why they were assigned to their respective EP-series, and \u2014 most practically \u2014 how to identify whether your specific application requires one over the other. It also explains the one scenario where Korea Ever-Power will substitute NYOGEL 792D into an EP-FPG\/FPGA unit normally supplied with CASTROL LMX: cold-climate deployments where the operating environment falls below 0\u00b0C.<\/p>\n

Both greases are sealed lifetime fills \u2014 neither requires scheduled relubrication within the gearbox design life. Neither has external access ports or grease nipples. The distinction between them is not about maintenance intervals (both are zero-maintenance) but about the physical chemistry of the grease under the deployment conditions your application actually experiences.<\/p>\n

<\/p>\n

\n
\ud83e\uddf4<\/div>\n
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Default Assignments \u2014 Which Series Gets Which Grease<\/div>\n
NYOGEL 792D<\/strong> is the standard fill for: EP-FAB, EP-FABR, EP-FAD, EP-FADR, EP-FADS, EP-FAL, EP-FALR. These are the precision series (P0\/P1\/P2 grades, DIN Class 5 gears). CASTROL LMX<\/strong> is the standard fill for: EP-FPG, EP-FPGA. These are the economy series (standard\/P2 grades, DIN Class 6\u20137 gears). The assignment is not arbitrary \u2014 NYOGEL 792D’s lower minimum temperature (\u221240\u00b0C vs 0\u00b0C) and cleanroom validation justify its use in precision series that are more likely to be deployed in cold-climate, cleanroom, or solvent-exposed environments. CASTROL LMX’s lower cost and adequate performance in normal industrial temperature ranges suits the economy series’ pricing model. Custom specification<\/strong>: NYOGEL 792D can be substituted into EP-FPG\/FPGA on request for cold-climate applications. CASTROL LMX is not substituted into precision series units.<\/div>\n<\/div>\n<\/div>\n<\/div>\n

<\/p>\n

<\/div>\n

Lubricant Suitability Matrix \u2014 Which Grease for Which Deployment Scenario<\/h3>\n

The matrix below maps eight deployment scenarios against both lubricant options. \u2713 indicates suitable under normal conditions. \u2717 indicates not suitable \u2014 risk of lubricant failure, contamination event, or application incompatibility. \u26a0 indicates conditional suitability \u2014 suitable with caveats that must be confirmed before specifying.<\/p>\n

\n\n\n\n<\/p>\n\n\n\n\n\n\n\n\n
Deployment Scenario<\/th>\nNYOGEL 792D
\n(precision series std)<\/span><\/th>\n		CASTROL LMX
\n(economy series std)<\/span><\/th>\n		H1 Food-Grade
\n(custom option)<\/span><\/th>\n		Critical Constraint<\/th>\nEngineering Rationale<\/th>\n<\/tr>\n<\/thead>\n
Standard industrial
\nIndoor, 5\u00b0C\u201360\u00b0C ambient<\/span><\/td>\n		\u2713<\/td>\n\u2713<\/td>\nNot required<\/td>\nNone \u2014 both within temperature range<\/td>\nUse whichever comes with the ordered series. No lubricant upgrade required for standard factory automation environments.<\/td>\n<\/tr>\n

<\/p>\n

Cold climate \/ outdoor
\nBelow 0\u00b0C operating temp<\/span><\/td>\n		\u2713<\/td>\n\u2717<\/td>\nNot required<\/td>\nCASTROL LMX viscosity becomes excessive below 0\u00b0C \u2192 motor overload at cold start<\/td>\nEP-FPG\/FPGA for cold climate: specify NYOGEL 792D substitution option at order. NYOGEL rated to \u221240\u00b0C continuous, \u221250\u00b0C start. Precision series (FAD\/FAB): standard NYOGEL \u2014 no change needed.<\/td>\n<\/tr>\n

<\/p>\n

High temperature zone
\nGearbox housing >90\u00b0C<\/span><\/td>\n		\u2713<\/td>\n\u26a0<\/td>\nNot required<\/td>\nCASTROL LMX continuous limit 90\u00b0C \u2014 housing above this risks ester oil oxidation and thickener breakdown<\/td>\nNYOGEL 792D rated to +125\u00b0C continuous, +150\u00b0C peak. For high-temperature drives (stenter frames, drying oven conveyors), EP-FPG with NYOGEL substitution or upgrade to EP-FAD recommended. Confirm housing temperature before specifying CASTROL LMX.<\/td>\n<\/tr>\n

<\/p>\n

ISO Class 5\u20136 cleanroom
\nPharmaceutical \/ semiconductor<\/span><\/td>\n		\u2713<\/td>\n\u2717<\/td>\nNot required
\n(sealed unit)<\/span><\/td>\n		CASTROL LMX not validated for ISO Class 5 particle emission. NYOGEL 792D validated for zero-particle emission in sealed EP-series housings at ISO Class 5.<\/td>\nPrecision series (FAD P0\/P1, FADS P0) with standard NYOGEL 792D satisfy cleanroom particle requirements in sealed operation. Economy series (FPG with CASTROL LMX) should not be used in ISO Class 5 cleanrooms without lubricant qualification testing.<\/td>\n<\/tr>\n

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Food processing zone
\nIncidental contact possible<\/span><\/td>\n		\u26a0<\/td>\n\u26a0<\/td>\n\u2713<\/td>\nNeither NYOGEL 792D nor CASTROL LMX is NSF H1 registered. H1 registration required if incidental food contact is possible.<\/td>\nBoth greases are sealed \u2014 no external grease points, no relubrication. If the IP seal remains intact (100% tested on EP-series), lubricant-food contact is by design prevented. H1 specification required only if the gearbox is in a zone where regulatory compliance mandates H1 regardless of seal integrity. Contact Korea Ever-Power for H1 option availability.<\/td>\n<\/tr>\n

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Solvent \/ chemical exposure
\nPrinting, gravure, pharma wash<\/span><\/td>\n		\u2713<\/td>\n\u26a0<\/td>\nNot required<\/td>\nCASTROL LMX ester base oil can hydrolyse under prolonged contact with strong acids or alkalis. Toluene, acetone, MEK exposure can dilute ester base oil through a compromised IP seal.<\/td>\nNYOGEL 792D PAO (polyalphaolefin) base is chemically inert to most industrial solvents. For gravure press (toluene\/ethyl acetate), printing blanket wash (IPA, naphtha), pharmaceutical CIP (NaOH, H\u2082O\u2082): NYOGEL 792D via precision series is the correct specification. If CASTROL LMX must be used, confirm chemical compatibility for the specific wash formulation.<\/td>\n<\/tr>\n

<\/p>\n

Saltwater \/ marine spray
\nAquaculture, coastal outdoor<\/span><\/td>\n		\u2713<\/td>\n\u2713<\/td>\nNot required<\/td>\nBoth greases have adequate water resistance in sealed housing. Below 0\u00b0C ocean temperature: specify NYOGEL 792D.<\/td>\nIP65 sealed housing prevents saltwater ingress \u2014 both greases are protected. CASTROL LMX lithium complex thickener is water-resistant (resists emulsification). NYOGEL PAO base is hydrophobic. Cold-ocean aquaculture (below 0\u00b0C): NYOGEL required.<\/td>\n<\/tr>\n

<\/p>\n

Surgical \/ sterile field
\nOR, ISO Class 5, robot wrist<\/span><\/td>\n		\u2713<\/td>\n\u2717<\/td>\n\u26a0<\/td>\nCASTROL LMX not validated for ISO Class 5 \/ operating theatre environments. H1 only required if sterility regulations mandate NSF H1 labelling regardless of containment.<\/td>\nEP-FADS and EP-FAD with NYOGEL 792D in sealed housing: validated for ISO Class 5 particle emission. Used in surgical robots and ISO 5 pharmaceutical cleanrooms. CASTROL LMX should not be used in surgical field applications without independent particle validation.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n
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Legend:<\/div>\n
\u2713<\/span>Suitable under normal operating conditions within specified temperature range<\/span><\/div>\n
\u26a0<\/span>Conditional \u2014 review stated constraint before specifying<\/span><\/div>\n
\u2717<\/span>Not suitable \u2014 risk of lubricant failure, particle emission, or regulatory non-compliance<\/span><\/div>\n<\/div>\n

Lubricant suitability assessments are based on the sealed EP-series housing design (IP65 on every unit) and the stated lubricant properties for NYOGEL 792D and CASTROL LMX under normal operating conditions. Actual suitability depends on housing temperature, chemical concentration, and seal integrity \u2014 all of which should be confirmed for specific applications. Contact Korea Ever-Power application engineering for application-specific lubricant guidance.<\/p>\n<\/div>\n<\/div>\n

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Technical Profiles<\/span><\/p>\n

NYOGEL 792D and CASTROL LMX \u2014 Full Technical Profiles and Why They Differ<\/h2>\n

Understanding why the two greases have different properties \u2014 and why those properties matter for gearbox performance \u2014 requires understanding their base oil and thickener chemistry. The following profiles explain both greases at the level needed to make informed application decisions.<\/p>\n

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\ud83d\udd2c<\/div>\n
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The Significance of NLGI Grade Difference \u2014 Grade 1 vs Grade 2<\/div>\n
NYOGEL 792D is NLGI Grade 1 (semi-fluid to soft); CASTROL LMX is NLGI Grade 2 (medium stiffness). This difference matters for two reasons. First, at low temperatures: Grade 1 greases flow more readily than Grade 2 greases at the same base oil viscosity \u2014 meaning NYOGEL 792D is more easily displaced from gear tooth surfaces at cold start than CASTROL LMX, even setting aside the base oil viscosity difference. Second, in high-speed applications: the churning losses from a stiffer Grade 2 grease at high pitch-line velocities are slightly higher than from a softer Grade 1 grease. For EP-FAD units running at 5,000\u20136,000 rpm input (the highest speed class in EP-series), NYOGEL 792D’s Grade 1 consistency contributes to the series’ low heat generation at rated speed. For EP-FPG units typically running at 1,000\u20133,000 rpm, CASTROL LMX Grade 2 is fully appropriate \u2014 the stiffer consistency provides better film retention in the slower, higher-contact-force gear mesh of economy-tier applications.<\/div>\n<\/div>\n<\/div>\n

<\/p>\n

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NYOGEL 792D<\/div>\n
Nye Lubricants | PAO synthetic hydrocarbon | Precision EP-series standard<\/div>\n<\/div>\n
\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Base oil type<\/td>\nPolyalphaolefin (PAO) synthetic hydrocarbon<\/td>\n<\/tr>\n
Thickener<\/td>\nFumed silica (inorganic)<\/td>\n<\/tr>\n
NLGI consistency<\/td>\nGrade 1 (semi-fluid to soft)<\/td>\n<\/tr>\n
Temp range (continuous)<\/td>\n\u221240\u00b0C to +125\u00b0C<\/td>\n<\/tr>\n
Temp range (peak)<\/td>\n+150\u00b0C (brief excursions)<\/td>\n<\/tr>\n
Base oil viscosity (40\u00b0C)<\/td>\n~95 cSt<\/td>\n<\/tr>\n
Colour<\/td>\nWhite \/ off-white translucent<\/td>\n<\/tr>\n
Water resistance<\/td>\nExcellent (PAO is hydrophobic)<\/td>\n<\/tr>\n
Chemical resistance<\/td>\nExcellent vs most solvents, dilute acids\/alkalis, fertilisers<\/td>\n<\/tr>\n
Cleanroom particle<\/td>\nISO Class 5 validated (sealed)<\/td>\n<\/tr>\n
NSF H1 food-grade<\/td>\nNo (standard NYOGEL 792D)<\/td>\n<\/tr>\n
EP-series standard fill<\/td>\nFAB, FABR, FAD, FADR, FADS, FAL, FALR<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
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PAO advantage:<\/strong> Polyalphaolefin base oil is chemically similar to a purified version of mineral oil but is synthesised rather than refined \u2014 it contains no wax, no aromatic compounds, and no sulphur. This gives PAO its wide temperature range (does not wax at low temperatures, does not oxidise at high temperatures), its inertness to most chemicals, and its hydrophobic nature. The fumed silica thickener is an inorganic material that is thermally stable, does not dissolve in solvents, and contributes to NYOGEL’s high tackiness \u2014 useful in vertical-shaft gearboxes where grease must stay on the gear teeth.<\/div>\n<\/div>\n<\/div>\n<\/div>\n

<\/p>\n

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CASTROL LMX<\/div>\n
Castrol Industrial | Synthetic ester | Economy EP-series standard<\/div>\n<\/div>\n
\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Base oil type<\/td>\nSynthetic ester base oil<\/td>\n<\/tr>\n
Thickener<\/td>\nLithium complex soap<\/td>\n<\/tr>\n
NLGI consistency<\/td>\nGrade 2 (medium stiffness)<\/td>\n<\/tr>\n
Temp range (continuous)<\/td>\n0\u00b0C to +90\u00b0C<\/td>\n<\/tr>\n
Temp range (brief)<\/td>\n\u221210\u00b0C start (with higher torque); +120\u00b0C brief<\/td>\n<\/tr>\n
Base oil viscosity (40\u00b0C)<\/td>\n~68 cSt<\/td>\n<\/tr>\n
Colour<\/td>\nLight beige \/ cream<\/td>\n<\/tr>\n
Water resistance<\/td>\nGood (lithium complex resists emulsification)<\/td>\n<\/tr>\n
Chemical resistance<\/td>\nGood \u2014 ester base may hydrolyse in strong acids\/bases or prolonged solvent exposure<\/td>\n<\/tr>\n
Cleanroom particle<\/td>\nNot specifically validated for ISO Class 5<\/td>\n<\/tr>\n
NSF H1 food-grade<\/td>\nNo (standard CASTROL LMX)<\/td>\n<\/tr>\n
EP-series standard fill<\/td>\nFPG, FPGA (economy series)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
\n
Lithium complex advantage:<\/strong> Lithium complex soaps produce a thermally stable, shear-stable thickener network that holds the base oil effectively at elevated temperatures (better than simple lithium soaps). The synthetic ester base oil has a good viscosity-temperature profile (better cold-flow than mineral oil, better high-temperature stability than standard mineral oil) without PAO’s wider extreme-temperature performance. For normal industrial temperature ranges (5\u00b0C to 85\u00b0C), CASTROL LMX is an excellent gear grease at lower cost than NYOGEL 792D.<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

<\/p>\n

Side-by-Side Technical Comparison<\/h3>\n

One additional dimension worth understanding is material compatibility with the gear and housing alloys in EP-series gearboxes. Both NYOGEL 792D and CASTROL LMX are formulated to be compatible with the steel gear alloys (carburised and case-hardened for EP-FAB\/FAD; through-hardened for EP-FPG\/FPGA), the aluminium alloy housings, and the NBR and FKM elastomers used in the dynamic shaft seals. The ester base oil in CASTROL LMX has marginally better lubricity (film strength at tooth contact) than PAO at equivalent viscosity \u2014 which is one reason CASTROL LMX is well-suited to the lower-speed, higher-contact-stress conditions of economy series gearboxes where the gear geometry produces a higher tooth contact stress per unit area than the finer-pitched, DIN Class 5 gears of the precision series. NYOGEL 792D’s PAO base provides better elastomer compatibility across a wider temperature range \u2014 PAO does not cause the elastomer swell or shrink that some ester oils produce in NBR seals at elevated temperatures, which contributes to NYOGEL 792D’s better IP seal performance at the temperature extremes of its rated range. This material compatibility consideration reinforces the series assignments: NYOGEL in precision series with DIN Class 5 fine-pitched gears and wider temperature range deployment; CASTROL LMX in economy series with coarser gears operating in normal industrial temperature bands.<\/p>\n

\n\n\n\n\n\n\n\n\n\n\n\n\n
Property<\/th>\nNYOGEL 792D<\/th>\nCASTROL LMX<\/th>\nSelection Implication<\/th>\n<\/tr>\n<\/thead>\n
Minimum operating temp<\/td>\n\u221240\u00b0C<\/td>\n0\u00b0C<\/td>\nAny application below 0\u00b0C requires NYOGEL \u2014 or NYOGEL substitution option for FPG\/FPGA<\/td>\n<\/tr>\n
Maximum continuous temp<\/td>\n+125\u00b0C<\/td>\n+90\u00b0C<\/td>\nHigh-temp applications (stenter, drying): confirm housing temp \u226490\u00b0C for LMX; if not, upgrade to precision series with NYOGEL<\/td>\n<\/tr>\n
Viscosity at \u221220\u00b0C<\/td>\n~600 cSt (remains pumpable)<\/td>\n~8,000\u201315,000 cSt (nearly solid)<\/td>\nAt cold start \u221220\u00b0C, CASTROL LMX resistance can exceed motor starting torque \u2014 inverter overload trip<\/td>\n<\/tr>\n
ISO Class 5 cleanroom<\/td>\n\u2713 Validated (sealed)<\/td>\n\u2717 Not validated<\/td>\nPharmaceutical, semiconductor, surgical robot: NYOGEL required; precision series only<\/td>\n<\/tr>\n
Chemical resistance<\/td>\nExcellent (PAO inert)<\/td>\nGood (ester hydrolysis risk)<\/td>\nSolvent-heavy environments (gravure, pharma wash): prefer NYOGEL; CASTROL LMX acceptable for most industrial chemicals<\/td>\n<\/tr>\n
Water resistance<\/td>\nExcellent (hydrophobic PAO)<\/td>\nGood (Li complex)<\/td>\nBoth adequate with intact IP65 seal; NYOGEL superior if trace ingress occurs<\/td>\n<\/tr>\n
NSF H1 food-grade<\/td>\nNo (standard formulation)<\/td>\nNo (standard formulation)<\/td>\nH1 custom option available on request for both series where regulatory compliance requires it<\/td>\n<\/tr>\n
Series assignment<\/td>\nFAB\/FAD\/FADS\/FAL\/FALR<\/td>\nFPG\/FPGA<\/td>\nCan specify NYOGEL substitution for FPG\/FPGA at order \u2014 see cold-climate option<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

<\/p>\n

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Engineering Deep Dive<\/span><\/p>\n

Why CASTROL LMX Fails Below 0\u00b0C \u2014 The Cold-Start Physics Explained<\/h2>\n
\n
\"Korea
\n<\/p>\n
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Operating Temperature Range<\/div>\n

<\/p>\n

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NYOGEL 792D<\/div>\n
\u221240\u00b0C<\/span><\/p>\n
<\/div>\n

+125\u00b0C<\/span><\/p>\n<\/div>\n<\/div>\n

<\/p>\n

\n
CASTROL LMX<\/div>\n
\u221240\u00b0C<\/span><\/p>\n
\n
<\/div>\n
<\/div>\n
<\/div>\n<\/div>\n

+90\u00b0C<\/span><\/p>\n<\/div>\n

Hatched zone = not rated (0\u00b0C limit)<\/div>\n<\/div>\n<\/div>\n<\/div>\n

The viscosity of a grease’s base oil increases dramatically as temperature decreases. All lubricants behave this way \u2014 the molecular motion that gives a fluid its ability to flow slows down in the cold, and the viscosity rises. What distinguishes NYOGEL 792D (PAO base) from CASTROL LMX (ester base) is the rate at which viscosity increases as temperature drops below 0\u00b0C.<\/p>\n

PAO (polyalphaolefin) base oils have exceptionally low pour points \u2014 the base oil in NYOGEL 792D remains fluid down to \u221250\u00b0C and continues to flow (with increasing resistance) to \u221240\u00b0C continuous operation. At \u221220\u00b0C, NYOGEL 792D’s base oil viscosity is approximately 600 centistokes \u2014 roughly 6\u00d7 its room-temperature value, but still a pumpable, flowable fluid that can be displaced from gear tooth surfaces under the contact pressure of the gear mesh.<\/p>\n

Synthetic ester base oils, used in CASTROL LMX, have excellent viscosity-temperature characteristics relative to mineral oil \u2014 but not as wide as PAO. At \u221220\u00b0C, the ester base oil in CASTROL LMX can reach 8,000\u201315,000 centistokes \u2014 effectively a solid at the scale of a gear tooth film thickness. When a motor attempts to start against this nearly solid grease resistance at cold ambient, the start-up torque required to move the gear mesh through the viscous grease can be 5\u201310\u00d7 the normal start torque. For a small servo motor driving an EP-FPG seeder unit on a prairie grain seeder at \u221215\u00b0C ambient, this excess start torque triggers the drive inverter’s overcurrent protection \u2014 the motor trips without completing its first rotation, which is exactly the field failure mode reported by Canadian seeder OEM customers before switching to NYOGEL 792D.<\/p>\n

\n
\u26a0<\/div>\n
\n
The Cold-Start Failure Mode \u2014 What It Looks Like in the Field<\/div>\n
In a cold-climate failure event: the servo motor attempts to start against a gearbox filled with near-solid CASTROL LMX. The motor current rises immediately to the inverter’s current limit without producing rotation. The inverter trips on overcurrent protection \u2014 typically within 200\u2013500 ms. The machine controller registers a servo fault and stops the sequence. The operator resets the fault and retries \u2014 the same trip occurs immediately. Only after the gearbox has warmed up (either from environmental heating or from multiple brief motor energisations that generate resistive heat in the stator) will the grease thin sufficiently to allow motor starting. In an agricultural machine at the start of a cold spring day, this can mean 30\u201360 minutes of failed starts before the machine will operate. The solution \u2014 NYOGEL 792D substitution \u2014 eliminates this failure mode entirely at the source.<\/div>\n<\/div>\n<\/div>\n

The temperature performance gap is the primary reason NYOGEL 792D is the standard fill for precision EP-series gearboxes: precision series are more frequently used in cold-climate environments (pharmaceutical refrigeration, cold-chain packaging, cryogenic handling, arctic field robotics) where CASTROL LMX’s 0\u00b0C lower limit would be a deployment blocker. Economy series gearboxes on standard industrial equipment seldom operate below 5\u00b0C \u2014 CASTROL LMX is fully appropriate for those applications.<\/p>\n

There is a related phenomenon at the upper temperature end that is less frequently discussed but equally important for high-duty applications: thermal runaway. In a gearbox running at high speed under continuous load, the gear mesh and bearing friction generate heat faster than the housing can dissipate it to the environment. The internal temperature rises until an equilibrium is reached where heat generation equals heat dissipation. For CASTROL LMX, this equilibrium temperature must remain below +90\u00b0C \u2014 if the gearbox is undersized for the duty cycle, or if it operates in a hot ambient (stenter frame at 80\u00b0C ambient, for example), the internal temperature can reach +90\u00b0C even at modest speeds. At that point, CASTROL LMX’s ester base oil begins to oxidise, and the lithium complex thickener starts to soften and lose its oil-retention characteristics. The grease does not fail immediately \u2014 degradation is gradual over hundreds of hours \u2014 but each hour above the rated temperature accelerates the lubricant’s depletion and increases the long-term wear rate. NYOGEL 792D’s +125\u00b0C continuous rating provides a significantly larger thermal margin for high-duty or hot-ambient applications, which is one reason Korea Ever-Power’s application engineering team recommends specifying the precision series (standard NYOGEL fill) for continuous-duty applications where housing temperatures regularly approach +80\u00b0C.<\/p>\n

A practical consequence of the viscosity-temperature difference between the two greases is visible in warm-up drift \u2014 a phenomenon well known to printing press and precision machine operators. When a cold gearbox starts from ambient temperature (say, +15\u00b0C on a factory floor in winter), the internal grease is more viscous than at steady-state operating temperature (+50\u201365\u00b0C typical for a loaded gearbox). As the gearbox warms during the first 15\u201330 minutes of operation, the grease viscosity decreases and the gear mesh friction torque changes. This produces a very slight apparent change in backlash and gear mesh compliance that the servo controller may interpret as a position drift \u2014 the “warmup drift” that press engineers observe as a small register shift during the first hundred impressions after a cold start. NYOGEL 792D’s lower viscosity change per degree Celsius (PAO has a better viscosity-temperature index than ester base) produces less warmup drift than CASTROL LMX under equivalent conditions. For high-precision applications where warmup drift must be minimised, NYOGEL 792D \u2014 and therefore the precision series \u2014 is the correct specification for this reason as well.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

<\/p>\n

\n
\n

Ordering Guide<\/span><\/p>\n

When and How to Specify NYOGEL 792D in EP-FPG\/FPGA \u2014 The Cold-Climate Substitution Option<\/h2>\n
\n
\"Korea<\/p>\n

Korea Ever-Power customer service confirms NYOGEL 792D substitution availability for EP-FPG and EP-FPGA within one business day of request. The substitution is a production-level change \u2014 the gearbox is assembled with NYOGEL 792D instead of CASTROL LMX before sealing.<\/p>\n<\/div>\n

When to Specify the NYOGEL Cold-Climate Option<\/h3>\n

Specify NYOGEL 792D substitution for EP-FPG\/FPGA whenever the gearbox may experience operating temperatures below 0\u00b0C \u2014 including ambient temperatures at the gearbox housing, not just process temperatures. The relevant temperature is the housing temperature at the moment the motor attempts to start, not the steady-state operating temperature. In well-insulated agricultural machines, the housing temperature at 7:00 AM in early spring can be \u22125\u00b0C to \u221215\u00b0C even when the daytime operating temperature is +10\u00b0C.<\/p>\n

Specific applications where the NYOGEL substitution is typically required: precision seeders and spreaders in Northern Europe, Canada, and North America that operate in early spring (April\u2013May in northern latitudes, where overnight frost is common); autonomous agricultural robots deployed year-round in cold climates; outdoor conveyor drives in warehouses or distribution centres that are not climate-controlled; fish farming and aquaculture equipment in cold-ocean environments; outdoor robotic systems with overnight shut-down and early-morning cold start.<\/p>\n

Specific applications where CASTROL LMX is adequate without substitution: all indoor industrial automation above 5\u00b0C; stenter frame transport drives in heated factory halls; barn automation in livestock facilities; standard packaging and manufacturing automation; indoor logistics and warehousing above 5\u00b0C ambient.<\/p>\n

A second category where lubricant review is warranted even for indoor applications is thermal accumulation in sealed enclosures. Textile stenter frames, industrial drying ovens, and curing tunnel conveyors operate with elevated ambient temperatures around the gearbox housing \u2014 not from the gear mesh friction, but from the surrounding process environment. A stenter frame transport drive mounted inside a 120\u00b0C drying chamber will reach a housing temperature of 80\u201395\u00b0C in steady state, depending on the gearbox thermal mass and the process air temperature. This is above the CASTROL LMX continuous limit of +90\u00b0C and within NYOGEL 792D’s comfortable operating range. For these applications, the correct specification is EP-FPG\/FPGA with NYOGEL 792D substitution \u2014 the economy series remains appropriate for the precision and cost requirements of transport drives, but the lubricant must be NYOGEL for the thermal environment. Korea Ever-Power application engineering confirms the correct specification for process-temperature applications when the gearbox housing temperature profile is provided.<\/p>\n

How to Order the Substitution<\/h3>\n

The NYOGEL 792D cold-climate option is a production specification \u2014 it must be specified at order, not requested as a post-delivery modification. The sealed gearbox housing cannot be opened and re-filled in the field without voiding the IP65 certification and the backlash grade stamp.<\/p>\n

\n
Order Specification \u2014 Cold-Climate NYOGEL Option<\/div>\n
Add “-NY”<\/span> suffix or note “NYOGEL 792D lube”<\/span> in the order remarks when ordering EP-FPG or EP-FPGA. Example:<\/div>\n
EP-FPG \u2013 060 \u2013 10 \u2013 P2 \u2013 C3 \u2013 NYOGEL 792D<\/div>\n
Economy series FPG, 60 mm frame, 10:1 ratio, P2 grade, C3 motor adapter, cold-climate NYOGEL 792D fill<\/div>\n
Note: Standard stock units contain CASTROL LMX. NYOGEL substitution requires 3\u20135 business days additional lead time to ensure correct production scheduling. Available for all FPG\/FPGA frame sizes and ratios.<\/div>\n<\/div>\n
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\ud83d\udccb<\/div>\n
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Confirming the Right Specification for Your Deployment<\/div>\n
If you are uncertain whether your deployment environment requires the NYOGEL substitution, send Korea Ever-Power the following: deployment location (country\/region), minimum expected ambient temperature at the gearbox housing at time of motor start (not daytime operating temperature), and the application type. Korea Ever-Power will confirm whether NYOGEL 792D substitution is required for your specific configuration. Contact: sales@planetary-gearboxes.cn \u2014 lubricant specification confirmation within one business day.<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

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\n
\n

Selection Checklist<\/span><\/p>\n

Lubricant Selection Checklist \u2014 Five Questions to the Right Grease Specification<\/h2>\n

For most applications, lubricant selection requires no action \u2014 the EP-series default assignment is correct. The five questions below identify the minority of applications where the default needs to be reviewed or changed. Work through them for every EP-series gearbox in environments that might approach the boundary conditions of either lubricant.<\/p>\n

\n
\n
Five-Question Lubricant Specification Review<\/div>\n<\/div>\n
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Q1<\/div>\n
\n
Will the gearbox housing be below 0\u00b0C at any time during operation or motor start?<\/div>\n
Yes \u2192<\/strong> Require NYOGEL 792D. If the ordered series is FPG\/FPGA (normally CASTROL LMX), add NYOGEL substitution to the order. Precision series (FAB\/FAD\/FAL\/etc.) already contain NYOGEL \u2014 no change needed. No \u2192<\/strong> Continue to Q2. Unsure \u2192<\/strong> Contact Korea Ever-Power with location and minimum ambient \u2014 they confirm which lubricant applies.<\/div>\n<\/div>\n<\/div>\n
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2\ubd84\uae30<\/div>\n
\n
Will the gearbox housing reach above 90\u00b0C continuously?<\/div>\n
Yes \u2192<\/strong> CASTROL LMX is not suitable above 90\u00b0C continuous. If the gearbox is FPG\/FPGA: upgrade to precision series (FAD\/FAB) with NYOGEL 792D (rated to +125\u00b0C). Alternatively, specify NYOGEL substitution for FPG\/FPGA if precision series is not required for other reasons. No \u2192<\/strong> Continue to Q3.<\/div>\n<\/div>\n<\/div>\n
\n
3\ubd84\uae30<\/div>\n
\n
Is the gearbox deployed in an ISO Class 5 cleanroom or sterile field?<\/div>\n
Yes \u2192<\/strong> Require NYOGEL 792D in a precision series gearbox with individual IP test certification. Economy series with CASTROL LMX should not be used in ISO Class 5 environments without independent particle validation. No \u2192<\/strong> Continue to Q4.<\/div>\n<\/div>\n<\/div>\n
\n
4\ubd84\uae30<\/div>\n
\n
Is the gearbox in a zone requiring NSF H1 food-grade lubricant?<\/div>\n
Yes \u2192<\/strong> Neither NYOGEL 792D nor CASTROL LMX in standard formulation is NSF H1 registered. Contact Korea Ever-Power for H1 lubricant option availability for the specific frame size and series. Both greases are sealed \u2014 incidental contact is prevented by design when IP seal integrity is maintained. H1 specification is required when regulatory compliance mandates it regardless of containment. No \u2192<\/strong> Continue to Q5.<\/div>\n<\/div>\n<\/div>\n
\n
Q5<\/div>\n
\n
Is the gearbox exposed to aggressive solvents or chemical wash cycles?<\/div>\n
Yes (strong solvents: toluene, MEK, chlorinated) \u2192<\/strong> Prefer NYOGEL 792D via precision series. PAO base is significantly more chemically resistant than ester base. IP65 sealed housing prevents ingress in normal operation \u2014 but if the IP seal has any micro-defect, NYOGEL 792D provides a second line of defence that CASTROL LMX does not. Yes (moderate: IPA, water-based cleaners) \u2192<\/strong> Both lubricants adequate with intact IP65 seal. No \u2192<\/strong> Default lubricant (series assignment) is correct \u2014 no action required.<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

<\/p>\n

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\n

Related EP-Series and Technical Guides<\/h3>\n
\n
\"Korea<\/div>\n

NYOGEL 792D is the standard fill for all precision EP-series: EP-FAB<\/a>, EP-FAD<\/a>, EP-FADS<\/a>, EP-FAL<\/a>, and EP-FALR<\/a>. CASTROL LMX is the standard fill for EP-FPG\/FPGA<\/a> (with NYOGEL 792D substitution available for cold-climate applications on request). Browse the full EP series product catalogue<\/a>.<\/p>\n

For the agricultural environment severity matrix that uses the 0\u00b0C CASTROL LMX constraint as a key decision factor: see the Precision Agriculture application guide on this site. For related mechanical drive components: cvjointdriveshaft.com<\/a>. For worm gearbox lubricant comparison context: worm-reducers.xyz<\/a>.<\/p>\n<\/div>\n

<\/p>\n

Frequently Asked Questions \u2014 EP-Series Lubricant Selection<\/h3>\n
\nCan I change the lubricant in a sealed EP-series gearbox after delivery?\uff0b<\/span><\/summary>\n
No \u2014 the EP-series gearbox housing is sealed at the factory as part of the IP65 certification process. The IP65 pressure decay test is performed on the sealed unit before shipment. Opening the housing to change the lubricant would void the IP65 certification (the seal would need to be re-tested), invalidate the backlash grade stamp (assembly conditions affect backlash), and potentially introduce contamination into the gear chamber. The lubricant specification must be determined before ordering and specified at order. If you have received EP-FPG\/FPGA units with CASTROL LMX and need NYOGEL 792D for a cold-climate application, the correct solution is to return the units and re-order with the NYOGEL substitution specification \u2014 or, if the units have not yet been deployed, contact Korea Ever-Power to determine whether a factory re-specification is possible before deployment.<\/div>\n<\/details>\n
\nIs NYOGEL 792D the same as other “white greases” used in food and medical equipment?\uff0b<\/span><\/summary>\n
NYOGEL 792D is a specific Nye Lubricants formulation \u2014 a PAO synthetic hydrocarbon base oil with fumed silica thickener and a characteristic white\/translucent appearance. It is not interchangeable with other white greases, which may use silicone, PTFE, or mineral oil base formulations with different chemical properties and temperature ranges. NYOGEL 792D is specifically selected for EP-series gearboxes because of its wide temperature range (\u221240\u00b0C to +125\u00b0C), its chemical inertness (PAO base), and its validated low-particle emission in sealed housings. It is not an NSF H1 food-grade registered product in its standard formulation \u2014 if NSF H1 is required, a different lubricant from Korea Ever-Power’s H1 option list is needed. If you see a reference to “white grease” in a specification and are uncertain whether NYOGEL 792D satisfies it, check whether the specification requires NSF H1 registration, ISO 21469 compliance, or specific chemical composition requirements, and confirm with Korea Ever-Power.<\/div>\n<\/details>\n
\nWhat happens if CASTROL LMX is used at \u22125\u00b0C \u2014 will it fail immediately or gradually?\uff0b<\/span><\/summary>\n
The failure mode is immediate on cold start, not gradual. At \u22125\u00b0C, the CASTROL LMX base oil viscosity is high enough that the grease behaves as a stiff paste rather than a fluid. When the motor attempts to accelerate the gear train from standstill, the gear teeth must displace this stiff grease from the contact zones to establish the elastohydrodynamic lubrication film. The resistance to this displacement is significant at \u22125\u00b0C \u2014 not quite as severe as at \u221215\u00b0C or \u221220\u00b0C, but potentially above the rated starting torque of small servo motors used in economy applications. The failure presents as: motor current reaches the inverter current limit immediately on start command, the motor does not rotate or rotates very slowly, and the drive trips on overcurrent or “blocked rotor” fault. After the motor has been energised for a few seconds (generating stator heat that conducts to the gearbox housing through the motor mounting), the grease warms slightly and the next start attempt may succeed. This intermittent behaviour is the characteristic pattern that indicates a cold-start lubricant issue rather than a mechanical failure.<\/div>\n<\/details>\n
\nDoes the NYOGEL 792D substitution in EP-FPG\/FPGA affect the gearbox warranty or design life?\uff0b<\/span><\/summary>\n
No \u2014 the NYOGEL 792D substitution in EP-FPG\/FPGA is a supported production specification, not a non-standard modification. When ordered with the NYOGEL specification, the unit is assembled with NYOGEL 792D instead of CASTROL LMX before the housing is sealed and the IP65 test is performed. The IP65 pressure test is the same regardless of lubricant. The backlash grade measurement and stamp are performed after assembly with NYOGEL 792D, so the nameplate stamp reflects the actual unit with the specified lubricant. The design life specification (20,000 hr S5 for FPG\/FPGA) applies to NYOGEL 792D fill within the NYOGEL rated temperature range (\u221240\u00b0C to +125\u00b0C). NYOGEL 792D’s higher load-carrying capacity compared to CASTROL LMX may, if anything, slightly extend the gear wear life \u2014 though Korea Ever-Power specifies the same 20,000 hr design life for both lubricant options on FPG\/FPGA to maintain conservative specification consistency.<\/div>\n<\/details>\n
\nAt what point should I upgrade from EP-FPG with NYOGEL to EP-FAD for extreme cold?\uff0b<\/span><\/summary>\n
The lubricant substitution (NYOGEL 792D in EP-FPG) handles the cold-temperature problem. The decision to upgrade from EP-FPG to EP-FAD (or EP-FAB) is separate and driven by precision and service-life requirements, not lubricant. If your application requires \u22648 arc-min standard grade, NYOGEL-filled EP-FPG is the correct solution for cold climates. If your application requires \u22643 arc-min P1 or \u22641 arc-min P0, or if 30,000 hr design life is needed vs FPG’s 20,000 hr, then EP-FAD or EP-FAB is the correct choice \u2014 and those series already contain NYOGEL 792D as standard. The only scenario where upgrading from FPG to FAD specifically for lubricant reasons applies is if the operating temperature exceeds +90\u00b0C (CASTROL LMX limit), requiring NYOGEL for its +125\u00b0C capability, and if NYOGEL substitution in FPG is not available for a specific stock requirement. In that case, EP-FAD with standard NYOGEL is the direct replacement.<\/div>\n<\/details>\n

<\/p>\n

\n
Confirm the Right Lubricant Specification for Your Application<\/div>\n
Send your deployment location, minimum expected housing temperature, application type, and ordered EP-series \u2014 Korea Ever-Power will confirm whether the standard lubricant applies or whether NYOGEL 792D substitution or H1 option is required, within one business day.<\/div>\n

Confirm Lubricant Specification \u2192<\/a><\/p>\n<\/div>\n<\/div>\n<\/div>\n

\ud3b8\uc9d1\uc790: Cxm<\/p>","protected":false},"excerpt":{"rendered":"

\u221240\u00b0C NYOGEL 792D Min Temp 0\u00b0C CASTROL LMX Min Temp +125\u00b0C NYOGEL Max Continuous +90\u00b0C CASTROL LMX Max Continuous ISO 5 NYOGEL Cleanroom Class Sealed Lifetime Fill \u2014 Both Greases Engineering Context Lubricant Is a Hidden Specification \u2014 Why the Grease Inside Your Gearbox Matters More Than Most Engineers Realise The sealed lubrication chamber of […]<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[19],"tags":[],"class_list":["post-189","post","type-post","status-publish","format-standard","hentry","category-application-and-technical-guid"],"_links":{"self":[{"href":"https:\/\/planetary-gearboxes.cn\/ko\/wp-json\/wp\/v2\/posts\/189","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/planetary-gearboxes.cn\/ko\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/planetary-gearboxes.cn\/ko\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/planetary-gearboxes.cn\/ko\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/planetary-gearboxes.cn\/ko\/wp-json\/wp\/v2\/comments?post=189"}],"version-history":[{"count":2,"href":"https:\/\/planetary-gearboxes.cn\/ko\/wp-json\/wp\/v2\/posts\/189\/revisions"}],"predecessor-version":[{"id":191,"href":"https:\/\/planetary-gearboxes.cn\/ko\/wp-json\/wp\/v2\/posts\/189\/revisions\/191"}],"wp:attachment":[{"href":"https:\/\/planetary-gearboxes.cn\/ko\/wp-json\/wp\/v2\/media?parent=189"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/planetary-gearboxes.cn\/ko\/wp-json\/wp\/v2\/categories?post=189"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/planetary-gearboxes.cn\/ko\/wp-json\/wp\/v2\/tags?post=189"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}