Dynamometer 02.7812.9501
1 – movable pointer; 2 – Torque limit indicator; 3 – body; 4 – handle; 5 – a rod with a tip inserted into the adapter sleeve of the drive gear flange fastening nut
To limit axial displacements of the drive gear under operating loads, it is very important to create a preload in its bearings within specified limits. The preload is controlled by a dynamometer 02.7812.9501, which measures the moment of resistance to rotation of the drive gear.
The torque resistance determines the degree of bearing tightening. It should be 156.8–196 N cm (16–20 kgf cm) for new bearings and 36.2–58.8 N cm (4–6 kgf cm) for bearings with a mileage of 30 km or more.
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The flange nut should be tightened to a torque of 117.6–254.8 N·m (12–26 kgf·m), periodically checking the moment of resistance of the bearings to turning the drive gear with a dynamometer.
Checking the moment of resistance
1. To check the moment of resistance, put the dynamometer 1 on the adapter sleeve 3 (2 - crankcase), set the pointer 2 (see fig. Dynamometer 02.7812.950) torque limiter to the scale division corresponding to 196 N cm (20 kgf cm), and make several turns of the handle clockwise. During the rotation of the drive gear, the movable indicator 1 should not go beyond the indicator 2 and should show at least 156.8 N cm (16 kgf cm).
2. If the torque of resistance to rotation is less than 156.8 N cm (16 kgf cm), and for bearings after a run of 30 km - 39.2 N cm (4 kgf cm), then tighten the flange nut of the drive gear (without exceeding the specified tightening torque) and check again the moment of resistance to turning of the drive gear.
3. If the torque resistance is more than 196 N cm (20 kgf cm), and for worn bearings 58.8 N cm (6 kgf cm), which indicates that the bearing preload is too high, replace the spacer sleeve with a new one, since it has been deformed due to excessive load to a size that does not allow correct adjustment. After replacing the spacer sleeve, repeat the assembly with the appropriate adjustments and checks.