Belarus 892 - Page 256

892-0000010B OM
256
- put tractor on level ground, stop the engine, brake it and exclude possible moving
by locking of rear wheels in front and back with wedges;
- jack front part of tractor and put supports under FDA according to jacking points
shown on the tractor;
- loose wheel retaining nut and remove wheels, observing safety measures;
- disconnect steering rod from left and right wheel hub drives and remove it from FDA;
- disconnect hydraulic cylinder mounting pins from eyes of wheel gear groups;
To make check of taper bearings preload in the following order:
- with a help of dynamometer define force of wheel hub drive turning in one direction
and than in other direction. Apply force to the wheel fastening bolts, located max.
near to the horizontal axis of wheel reduction unit.
- Axial preload in bearings shall correspond to the force of wheel gear groups turn from
60 to 80 N, applied to the wheel fastening bolts. It is necessary to repeat force check
operation three times in each direction to determine average value.
If force of turning is between 30 N and 50 N, it is necessary to make pivot bearings preload
adjustment in the following order:
– check up tightening torque of lower axle 7 bolts, that should be between 180 and
200 Nm);
– unscrew four bolts 4 (Figure 6.4.35) fastenings upper pivot axle 1;
– by means of extracting bolts raise upper axle 1 and reach the necessary bearings
preload by removal of shim washers 5 of identical thickness from both sides of axle flange;
– tighten axle fastenings bolts 4 with a moment of 180…200Nm, the bolts should be
tightened crosswise with obligatory turning from side to side of wheel hub drive;
–check again pivot bearings preload by means of check of reduction unit turning force
in both directions;
– repeat above mentioned work for the other wheel gear group.
If the turning force is below 30 N, then before adjusting preload in bearings, it is necessary
to dismount the lower axis 7 (Figure 6.4.35) and check the lower bearing for technical con-
dition.
If force of turning is less than 30 N, it is necessary to dismount before bearings preload
adjustment the lower axle 7 (Figure 6.4.35) and check technical condition of the bearing.
After adjustment make lubrication of a wheel hub drive. Pump lubrication through oilier 3 in
axles 1,7, having removed prior protective cap 2.
After bearings adjustment and lubrication of pivot connection mount removed from FDA
parts in reverse order. Tighten nuts fastening steering cylinder with moment of 180 … 200
Nm and nuts fastening of steering rod with the moment of 110 …130 Nm.