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c. Adjustment of mesh backlash and mesh print
During adjustment, the bevel gear and pinion axially moving will change both mesh
backlash and mesh print. If the mesh print requirement is contradictory to mesh backlash,
correct mesh print should mainly be ensured, and the adjustment range of mesh backlash can
be enlarged (Especially when the gear and bearing wears and the readjustment is needed, the
backlash can be enlarged). But the mesh backlash should be not less than 0.1mm.
During normal operation of the tractor, the normal mesh backlash and mesh point will
both change, under this condition, so long as teeth faces contact is normal, only the mesh
backlash increases, and this increase of backlash due to gear wear need not be adjusted. But
after the overhaul of the tractor or when replacing a new pair of main drive gears or bevel
bearing, the mesh print and backlash should be ensured at the same time by careful
adjustment.
Note: As the bevel pinion and the bevel gear are a pair of matched gears, be sure not to
make pairs in disorder. The spiral bevel gears should be replaced together with the bearings,
if possible. Otherwise, it will affect their service life.
3. Adjustment of differential lock
The differential lock can be adjusted through bolt (3) and nut (4). During adjusting,
the gap between left claw (9) and right claw (7) should be about 2mm. Screw in or out the bolt
(3) to increase or reduce the gap. After the adjustment has been done, use nut (4) to tighten
bolt (3). (Fig.4-4)
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4. Adjustment of brake
After the tractor has worked for a period, the wear of the friction disc of the brake
makes the gap between friction disc and brake drum or friction disc and brake case and
brake cover increase and affect the brake performance. Excessive free travel will cause brake
ineffectiveness. So the brake should be regularly adjusted to ensure the safety walk of the
tractor. When one of the following faults of the brake appears, adjustment should be done in
time. (No matter the tractor is new or old).
a. Free travel of brake pedal is excessive and cause brake ineffectiveness.
b. Free travel of brake pedal is too small and keep the brake in semi-braking state; the
brake case also generates heat.
c. Left and right braking force is unidentical and tractor yaw motion appears.
1)Adjustment of block brake(shoe brake)
A. Free travel adjustment of brake pedal is the displacement measured from the
highest position of the pedal ,when resistance is felt by pressing the pedal .The travel should
be in the range of 55-65 mm (Fig.4-5) .During adjustment ,firstly loosen the locking nut (9) on
brake pull rod (8) and change the length of the brake pull rod ,then press the brake pedal (5)
from its highest position untill the displacement it 55-65mm and the gap between brake drum
(13) and brake shoe(12) is eliminated . Make the left and right brake pull rod adjustment be
identical ,the tighten them with locking nut (9) (Fig.4-5).
B.Tractor yaw motion adjustment
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While left and right brake adjustment is unidentical and the tractor running in high
speed is braked in emergency , unidentical tyre print length (left and right ) and yaw motion
appear .In such case ,the brake pull rod should be shortened in the side with short print
length of tire ,or vice versa, to make both sides of
the driving wheels to be braked
simultaneously and reliably ,then retighten the locking nut (9) . Subsequently ,check in the
3rd gear firstly ,after above adjustment has been done ,the check in the 4th gear again.
2) Adjustment of disc brake
A. Free state adjustment of disc brake pedal is the displacement measured from the
highest
Loosen the outer locking nut M10 (5) on adjusting rod (1) and turn the inner nut M10
(4) to change the mounting angle of the rock arm (2) through the longitudinal motion of the
self-position cushion (3) and ensure that the central connecting line of the upper and lower
holes inclines to rear from the plumb line. After adjustment, lock it with locking nut (5). (Fig.4
-6)
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B. Travel adjustment of brake pedal
Loosen the locking nut (7) on pull rod adjusting fork (6) and turn brake pull rod
adjusting fork to change the length of the pull rod (8) until the displacement (from the highest
position of the brake pedal to friction disc assembly being completely braked) of the brake
pedal is 85-95mm. When the left and right pedal are locked together, stepping on the pedals
can simultaneously brake the left and right wheels; after adjustment, lock it with nut (7).
(Fig.4-6)
If the above adjusting range can not perfectly make the free state and brake state out,
they can be adjusted through increasing or reducing the brake cover gaskets (11) between
brake cover (12) and brake case (10). If the brake travel is too small, increase the gaskets; if
the brake travel is too big, reduce or remove the gaskets. (Fig.4-6)
C. Brake yaw motion adjustment
Refer to the adjustment of shoe brake
5. Adjustment of front axle
1) Axial clearance adjustment of front wheel bearings
The normal axial clearance between front wheel bearings (8) and (9) is 0.1-0.2mm(Fig.4
-7). During operation, when the clearance is more than 0.4mm, the front wheel will swing to
left or right during walking; and the bearings are easily broken by shock load, so adjustment
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