33
Points for attention:
a. Make sure that front and rear wheels are symmetrical about the tractor centerline after
adjustment is made.
b. Rear wheels can be exchanged for adjusting wheel tracks
(for rear wheel only).
c. Make sure that the direction of lugs are determined by facing in the direction of forward
travel.
5.3.1
Adjustment of front wheel drive axle
Meshing conditions of gears of front wheel drive axle affects greatly the driving
efficiency and noise level, so attention must be paid to precision adjustment of gears
while assembling.
The construction of front wheel drive axle is shown
in Fig. 7. There are 3 pairs of bevel gears in
meshing from front center driving bevel pinion to
drive shaft in the front wheel drive axle. The gear
backlash and meshing zone print (the print should be
in the middle of all the teeth face and deflecting to
small end of teeth slightly, i.e. short toe contact, see
Fig. 6) of every pair of gears should be adjusted with
great care.
a. The meshing of front main drive gears is adjusted by
selecting the shims (15) of bearing seat and the shims
(11) of main drive case of suitable thickness to ensure the correct meshing print and the
gear backlash within 0.16
～
0.32 mm. Meanwhile, keep the pre-stress of bearing on both
ends of the differential within 100
～
150 N;
b. The meshing of mid gear pair at both ends of front wheel drive axle is adjusted by
selecting the shims (1) of suitable thickness to ensure the gear backlash within 0.16
～
0.3
mm and the correct meshing print.
c. To ensure the gear backlash of final drive within 0.16
～
0.3 mm, it could be done by
altering the thickness of shims (13) for final drive, meanwhile, keep the correct meshing
print.
d. The clearance of 0.1
～
0.5
mm
between the lower-face of the retainer rings (4) of the
upright shaft (3) at either end and the upper-face of driven pinions (7) is obtained by
selecting and using the shims (6) of suitable thickness.
Fig. 6 Meshing prints of bevel
gears
