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3.3.2.2 Clutch dismantling
Clutch is dismantled after the engine has been detached from the transmission in
the following order:
- mount four manufacturing bolts (M12x65), having screwed them into the pressure
disk 5 (figure 3.3.2) through the manufacturing orifices of the back plate 7;
- unscrew the bolts 6 and remove the clutch plates assembly (the back plate 7 together
with the pressure plate 5);
- remove the first driven disk 4;
- unscrew the bolts 3 and 21 and remove the spacer 22 with the center plate 2;
- remove the second driven disk 1.
ATTENTION: BEFORE STARTING TO DISMANTLE THE CLUTCH IT IS RECOM-
MENDED THAT YOU MAKE MARKS, IDENTIFYING MUTUAL ARRANGEMENT OF THE
FLYWHEEL 23, THE CENTER PLATE 2, THE SPACER 22, THE PRESSURE PLATE 5
AND THE BACK PLATE 7. ASSEMBLE THE CLUTCH IN ACCORDANCE WITH THE
MARKS!
3.3.2.3 Clutch installation
The clutch is installed in the following order:
o mount a splined workholder in the bearings of the flywheel 23 (figure 3.3.2);
o mount the first driven disk 1 on the workholder with the hub short end facing the
flywheel 23;
o mount the center plate 2 in the slots of the spacer 22 so that the cavity on the
outer surface is directed towards the flywheel;
o mount the spacer 22 with the center plate 2 on the flywheel and fix with bolts 3
and 21;
o mount the driven disk 4 on the workholder with the hub short end facing the fly-
wheel;
o mount the clutch plate assembly (the back plate with the pressure plate 5) on the
spacer pins, fix with bolts 6 and unscrew the manufacturing bolts.
3.3.2.4 Adjustment of clutch release levers
- screwing the adjusting nut 14 (figure 3.3.2) in or out, adjust the position of the rest of
release levers 18 for the dimension of (20±0,165) mm from the rest mounting surface to the
outer surface of the back plate 7. Pressing the rest 18 with your hand, check the adherence of
the release levers to it: all levers shall touch the rest;
- after adjustment mount the lock plates 11 and 12;
- remove the workholder;
3.3.3 Clutch drive
The clutch drive is intended to control the coupling clutch, on forward motion and on
reverse. The clutch drive type is hydrostatic with suspended pedals, with a hydraulic
booster (figure 3.3.4).
The drive consists of main cylinders 12 (for forward motion) and 19 (for reverse
mode), suspended pedals 10 (for forward motion) and 20 (for reverse mode), a cock 27
(for automatic switching between modes of tractor operation on forward motion and on re-
verse), an operating cylinder 32, a hydraulic booster 35, a lever 43, a tank 1, pipelines 11,
13, 18, 25, 41.
The hydraulic booster 35 of a non-circulation type is intended to reduce force applied to
pedals 10 and 20 in the course of clutch engagement. The hydraulic booster is connected with a
transmission hydraulic system pump by means of a pipeline 13 via a distributor, and by means of
a pipeline 41 with a drain group. In the mode of forward motion when the pedal 10 is pressed, the
braking fluid is delivered from the main cylinder 12 to the cock 27 through the pipeline 11. The pis-
ton 26 in the cock 27 moves into the right extreme position and shuts the inlet of the pipeline 18.
Then the braking fluid is supplied to the operating cylinder 32 through the pipeline 25, thus moving
a pusher 33. The pusher 33 works on a rod 34 of the hydraulic booster 35, as a result the hydrau-
lic booster 35 goes off and moves out a piston 37 as well as a pusher 38 with a spherical nut 40,
rotating a lever 43, linked with a clutch throw-out 45 through a shaft, resulting in engine detach-
ment from the transmission. In the mode of operation on reverse when the pedal 20 is depressed
the braking fluid is delivered from the main cylinder 19 to the cock 27 through the pipeline 18. The
piston 26 in the cock 27 moves into the extreme right position and shuts the inlet of the pipeline
11. Then the braking fluid is supplied to the operating cylinder 32 through the pipeline 25, perform-
ing the actions as described above.
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