MTZ 1220.1, Руководство оператора

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MTZ 1220.1/1220.3 Section H. Adjustments
H8
Checking and adjusting axial preload in pivot tapered bearings
Prior to adjusting the axial preload in
the pivot tapered bearings (7) (Fig. H-5a),
peform the following preparatory work:
- clean the PTO of dirt
- install the tractor on an even surface,
brake it and exclude possible movement;
- jack up the front of the tractor
installing supports under the FDA in the
points of jacking;
- unscrew the nuts fastening the wheels
and remove the wheels, observing safety
precautions;
- disconnect the steering rod from the
left and right wheel reduction gears and
remove it from the FDA;
- disconnect the finger fastening the
hydraulic cylinder from the mounting
bracket fixed to the wheel reduction gear;
- using a dynamometer, determine the
force of rotation of each wheel reduction
gear, first in one and then in the other
direction. Apply force to the wheel bolts
nearest to the horizontal reduction gear
axis.
The axial preload in the bearings must
correspond to the force of rotation of the
reduction gear from 60 to 80 N applied to
the wheel bolts. Repeat the force check
three times in each direction to determine
the average value.
With a turn force of 30 to 50 N, adjust
preload in the pivot bearings proceeding
as follows:
- check the tightening force of the
lower axle bolts (180 to 200 N•m);
- unscrew the four bolts M16 fastening
the upper pivot axle;
- using the extracting bolts, lift the
upper axle (4) (Fig. H-5a) and removing
the adjusting shims (2) of the same
thickness from both sides of the axle
flange, achieve the required preload in the
bearings;
- tighten up the bolts (5) (Fig. H-5a)
fastening the axles to a torque of 180 to
200 N•m, make the tightening crosswise
with mandatory cranking of the wheel
reduction gear;
- re-check the preload in the pivot
bearings by checking the force of turning
the reducer in both directions;
- do the same for the second wheel
reducer.
At a turn force of less than 30 N, before
adjusting the preload in the bearings,
unmount the bottom axle (9) (Fig. H-5a)
and check the condition of the lower
bearing.
After adjusting, lubricate the wheel
reducer bearings. Inject the lubricant
through the lubricator in the axles (4), (9).
After adjustment and lubrication of the
pivot connection bearings, install the parts
removed from the FDA in the reverse
order. Tighten the nuts fastening the
steering cylinder to a torque of 180 to 200
N•m and the nuts fastening the steering
rod to a torque of 110 to 130 N•m.
Make subsequent adjustments of the pivot
bearings every 500 hours.
Checking and adjusting axial play in drive pinion tapered bearings of wheel reducer
Check and adjust axial play in the
drive pinion tapered bearings (14) (Fig. H-
5a)of the gear set as follows:
Use an indicator to check the axial play in
the tapered bearings (1) (Fig. H-5a)
measuring the displacement of the double
joint fork.
The axial play in the tapered bearings
must not exceed 0,05 mm. If necessary,
adjust as follows.
- loosen the fastening of the barrel (3) (Fig. H-
5a).
- using the extracting bolts, move away
the barrel (3) and removing the adjusting
shims 4 (Fig. H-5a) of the same thickness
from both sides of the barrel flange,
achieve the required clearance of 0.05
mm max.
- tighten up the bolts fastening the barrel
to a torque of 20 to 25 N•m, make the
tightening
crosswise with mandatory
cranking of the double joint; To ensure