Low Lubricant Level

DIAGNOSIS AND TESTING - NV3500 Manual Transmission
LOW LUBRICANT LEVEL
A low transmission lubricant level is generally the result of a leak, inadequate lubricant fill or an incorrect lubricant level check. Leaks can occur at the mating surfaces of the gear case, intermediate plate, adaptortension housing or from the front/rear seals. A suspected leak could also be the result of an overfill condition.

Leaks at the rear of the extension or adapter housing will be from the housing oil seals. Leaks at component mating surfaces will probably be the result of inadequate sealer, gaps in the sealer, incorrect bolt tightening or use of a non-recommended sealer.

A leak at the front of the transmission will be from either the front bearing retainer or retainer seal. Lubricant may be seen dripping from the clutch housing after extended operation. If the leak is severe, it may also contaminate the clutch disc causing the disc to slip, grab and or chatter.

A correct lubricant level check can only be made when the vehicle is level. Also allow the lubricant to settle for a minute or so before checking. This will ensure an accurate check and avoid an underfill or overfill condition. Always check the lubricant level after any addition of fluid, to avoid an incorrect lubricant level condition.