Maintenance of the rear axle consists in maintaining the oil level in the crankcase and replacing it in a timely manner, checking the seals, timely detection and elimination of axial clearances in the final drive gears
Periodically clean the safety valve, tighten all fasteners.
If the oil in the crankcase is heavily contaminated or metal particles are noticed in it, then flush the crankcase with kerosene before filling with fresh oil.
For flushing, pour 1–1.5 liters of kerosene into the crankcase; lift the wheels, start the engine and let it run for 1.0-1.5 minutes, then drain the kerosene and fill in fresh oil.
Axial clearance of final drive pinion is not allowed. Check the clearance by rocking the drive gear by the propeller shaft mounting flange.
If during the operation of the vehicle an axial clearance of the drive gear exceeds 0.05 mm, tighten the nut 7 (Fig. 1). Tightening torque - 167–206 Nm (17–21 kgf m).
If the gap is not eliminated, adjust as indicated in the article "Assembly and adjustment of the rear axle UAZ-3151".
Axial clearance of the final drive gear is not allowed. Check it by moving the gear through the oil filler hole.
To eliminate the gap, add equal thickness sets of gaskets between the ends of the differential and bearings.
Do not add shim kits of different thicknesses and do not install them on the same side of the driven gear as this will lead to a violation of the engagement of worn-in gears and their rapid breakage.