Proper lubrication with quality lubricants will ensure your GMN sprag clutch is operating at the highest efficiency and long life span.
The table below lists a few suggestions for both oil and grease lubrication that we’ve proved to be successful by testing and specification validation. If you would like another lubrication and it’s not listed below, please contact us so we can make sure it’s compatible and won’t result in any failure.
|OIL TYPE||OPERATING TEMPERATURE RANGE|
| -15°C – 30°C|
(5°F – 86°F)
|15°C – 90°C|
(59°F – 194°F)
|60°C – 120°C |
(140°F – 248°F)
|Hydraulic Oil||Hydraulic Oil HM 10||Hydraulic Oil HM 32 D||Hydraulic Oil HM 100|
|Motor Oil||HD-Motor Oil SAE 10 WATF-DEXRON III||HD-Motor Oil SAE 30|
Motor Oil lubricant is the type you find in the automotive section. Please note: HD-motor oil SAE 10 W or SAE 30 is equal to API-Service SE or CC or MIL-L-46152B.
Important: Only mix oils in the table with the same oil branded material, for example, ATF oil should only be mixed with ATF oil and HD-motor oil should only be mixed with other HD-motor oil, and so on. If there’s ever any change of oil brand, it’s necessary to clean the Sprag Clutch and all it’s mating parts with cleaning or test benzine. Never use trichloroethylene or perchloroethylene to clean any components.
Oil levels should be in relation to the size of the Sprag Clutch. In normal installation position (not operating) one-third of the clutch should be submerged in oil.
For oil mist lubrication systems we recommend ample clean oil, free of moisture, be sprayed directly onto clutches. Open or unsealed housings should be inspected frequently – at least daily – for proper lubrication level.
Our double-sealed Sprag Clutches (series FND and FPD) are filled with our standard oil for operating temperatures between 15°C – 90°C if not specially ordered. Other lubrication types are available, contact us for more details.
Some types of grease won’t work with our sprag clutch line, especially if they contain additives. For example, lubrication additives like extra pressure (EP) additives for transmission or gearbox applications may prevent the the sprag clutch from working properly. Greases from different manufacturers may not be compatible. Consult with GMN for proper lubrication recommendations.
Please note: There is no universal grease for all service and operating conditions. The table below lists suitable grease types and characteristics for GMN Free-wheel Clutches.
|PRODUCER||GREASE TYPE||SAPONIFICATION||OIL BASE||OPERATING TEMPERATURE AT GMN FREE-WHEEL CLUTCHES||CHARACTERISTICS|
|Klüber Lubrication||ISOFLEX LDS18 Special A||Lithium||Ester/Mineral||-30° C … 130° C|
-22° F … 266° F
|Deep temperature and long-term grease with high resistance to aging and corrosion.|
|Shell||Alvania RS||Lithium||Mineral||-10° C …120° C|
14° F … 248° F
|Long term grease with high resistance to aging and corrosion.|
|Klüber Lubrication||Bio BM72-50||Polyurea||Ester||-20° C …120° C|
-4° F … 248° F
|Biological grease especially for overrunning and backstopping|
|Klüber Lubrication||Synth HB72-102||Polyurea||Ester||-40° C …180° C-40|
° F … 356° F
|Synthetic grease especially for overrunning and backstopping|
First two grease types to be used in standard applications.
The amount of grease should cover approximately 60% of the free volume in the clutch. Please take care for homogene dispersion of the grease all over the clutch.
GMN uses ball and roller bearing grease which is continually monitored for maximum quality and maximum clutch life. Sealed ball bearing clutches “RS” and “2RS” are shipped grease lubricated with grease type Isoflex LDS 18 Special A, if not specially ordered.
GMN can not endorse or guarantee the quality of lubricants, purchased by their customers to be used with GMN clutches. Last update of the qualifications: May 1999
Information about GMN Roller Ramp Clutches could be found here.