Cause of malfunction | Elimination Method |
Noise in the gearbox Noise decreases or disappears when the clutch is depressed | |
Insufficient oil level in the gearbox housing | Check the level, add oil if necessary. Check for leaks. Clean or replace breather if necessary |
Wear or damage to bearings, gear teeth | Replace worn bearings, gears |
Transmissions are difficult to turn on, there are no extraneous noises | |
Deterioration of the shift lever, spherical washer, screw limiting the transverse travel of the lever, deformation of the lever | Replace worn and deformed parts |
Sticking of the spherical joint of the gear lever | Replace deformed parts, put Litol-24 or SHRUS-4 grease in the hinge |
Fork rods are tight (locking nuts jammed, burrs on the rods, dirt in the sockets) | Replace worn and deformed parts |
Sliding clutch moves tight on the splines of the hub | Clean the slots from dirt, cut the burrs with a needle file |
Deformed shift forks | Replace Plugs |
Clutch won't disengage | |
Lever not locked in position «neutral» between III and IV gears | |
Lever release spring slipped or broken | Put the spring back in place |
Transmissions randomly turn off | |
Detent springs have lost elasticity, balls and/or stem seats are worn | Replace worn parts |
Damaged or worn synchronizer rings | Replace rings |
Damaged or worn clutch teeth or synchronizer ring gear | Replace clutch or gear |
Synchronizer spring broken | Replace spring |
Noise, crackling, squealing at the moment of switching on the gear | |
Clutch does not fully disengage | |
Too little oil in the gearbox housing | Add oil. Check for leaks. Clean or replace breather |
Worn or broken gear teeth and/or synchronizers | Replace Parts |
Wear or deformation of the gear synchronizer ring | Replace ring |
Axial play of gearbox shafts | Tighten bearing mounts, replace worn bearings |
Oil leak | |
Cuff wear | Replace cuffs. Clean or replace transmission breather if necessary |
Strong wear, nicks on the surfaces of the shafts on which the cuffs work | Clean up minor damage with fine-grained sandpaper and polish. When installing a new cuff, you can slightly underpress it, avoiding distortion (if necessary, placing spacers up to 1 mm thick under it), so that the edge of the cuff works on the unworn part of the shaft. In case of significant damage - replace the shafts and cuffs |
Increased pressure in the gearbox due to clogged breather | Clean or replace transmission breather |
The fastenings of the covers of the gearbox housing, clutch housing have loosened. Gasket damage | Tighten screw connections. Replace gaskets (when installing them, you can use a sealant) |
Oil drain and fill plugs loose | Pull up the plugs (you can seal them) |