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When adjusting the free travel of the clutch pedal (Fig. 4-1), firstly adjust the length of
clutch push rod (15) to ensure that the clearance between end faces of three release levers and
±
release bearing is 2.5
0.5mm and the idle travel of release rock arm is 3.5-5mm; after
adjustment tighten it with nut M10.
Position limit adjustment of working travel of clutch pedal: loosen nut (10), then turn
adjusting bolt (11) to make the working travel under release rock arm (12) is 25mm, then
tighten nut (10).
2) Adjustment of single stage clutch
Fig.4-2 is single - disk and dry single stage clutch . It is made up of clutch spring(1),
clutch driven plate(2) ,clutch pressure plate(3) ,release lever(6) ,adjusting nut (7) ,release
bearing (9) and its operation mechanism.
The adjuting methods of single stage clutch are as follows:
A. Position adjustment of release levers
In reassembling the clutch,turn adjusting nut(7) to make the distance between working
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faces of release levers and the working face of pressure plate be B=45mm. When the clutch
engages, the gap A=2-3mm between release bearing (9) and release levers (6) should be kept;
and 3 working faces of the release levers (6) should be in the same plane , the allowed
deviation is 0.25 mm.
B.Free travel adjustment of clutch pedal
Turn push rod adjusting fork (16) to change the effective length of push rod (14) until it
reaches the free travel of the clutch pedal L=8-12 mm (while the corresponding free travel
under the release rock arm (17) is L1=3.5-5.5 mm ).
C. Position limit adjustment of working travel of
clutch pedal
Turn limiting adjusting bolt (18) until the working travel under release rock arm(17) is
L2=13-17mm . In operation the free travel of the clutch pedal should be often checked and
ensured.
2. Adjustment of main drive
1)Preload adjustment of the conical bearing
During assembling there should be some preload on two conical bearings (3) 2007111
(on two ends of differential) and two conical bearing 27305(10) (on second shaft) (Fig.4-3) for
25
reducing axial displacement and increasing supporting rigidity of the spiral bevel gears under
operation. After operation for a period, as the conical bearings wears, the former preload will
disappear gradually, and moving clearance will occur between the two conical bearings when
the two moving clearance is more than 0.1 mm, the conical bearings should be preloaded
again.
A. Preload adjustment of second shaft conical bearing
Adjust the screwing tightness of the locking nut (11) near the bearing until the torsional
friction torque of the second shaft (9) is 0.7-1.1 N.m. After adjustment, insert locking slice
(12), then tightly screw the second locking nut (11).
B. Preload adjustment of differential conical bearing
Insert the adjusting shims (5) in same quantities between the two sides of transmission
box (2) and the bearing seats (4) of conical bearings, then tightly screw the bolts (6) of the
bearing seats; and turn second shaft (9), if the torsional torque is 0.4-0.76 N.m more than that
of the condition that the differential is not mounted, then the preload is suitable. In such case,
any axial displacement of the crown gear should not exist with the axially applied thrust.
2) Adjustment of meshing prints and backlash of the spiral bevel gears
A. Standard of meshing backlash and meshing print
The required mesh backlash is 0.1-0.25 mm. The ideal mesh prints distribute in the
middle of the working teeth surface and are slightly near the small end of the teeth; meshing
prints are like spots; meshing print height is not less than 50% of tooth height, the length of
meshing print is not less than 60% of tooth length.
B. Inspection of mesh backlash and mesh print
a. Inspection of mesh backlash
There are two methods of inspection: One is dial gauge inspection. During measuring,
put contact terminal on the teeth surfaces of big ends of bevel gear, and fix bevel pinion,
swing bevel gear in rotating direction; if the reading of the dial gauge is 0.14-0.3mm(circular
clearance), the backlash is correct. The other method is as follows: Using a lead wire of 15-
∽
20mm long and 0.5mm thick or a fuse bent into "
" shape, put it between the unmeshed
teeth surfaces of the bevel gear and pinion(i.e. between the convex surface of the bevel pinion
and the concave surface of the bevel gear) and rotate the gear pair, then the thickness of the
extruded part where the lead slice is near the big ends of the gears is the vertical gear
backlash. The gear backlash should be among the range of 0.1-0.25mm(vertical backlash). It
is better to measure three or more points well distributed along the circumference of the bevel
gear and take the average value of measuring the gear backlash in the three or more points.
b. Inspection of mesh print
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Coloring method is adopted in the inspection of the mesh print. Smear red-lead paint
evenly on the faces of the bevel gear teeth. Turn the bevel gears several times until the distinct
contact traces are imprinted on the teeth faces of the bevel pinion. The print imprinted on the
teeth faces of the bevel pinion is mesh print. As the spiral direction of the bevel pinion is right-
handed, when the tractor forwards, the force is applied on the concave face of the bevel
pinion, the readlead paint should be smeared on the convex face of the bevel gear; while the
tractor reverse, the force is applied on the convex face of the bevel pinion, the red-lead paint
should be smeared on the concave face of the bevel gear
.
Table 4-1 Adjustment of mesh print of bevel gear
Note: solid line arrow shows the adjustment of mesh print and dotted line shows the
adjustment of mesh backlash.
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