2122.6-0000010 OM
205
Table 6.1.1 continued
Failure,
external manifestation, cause
Troubleshooting
Clutch lever 35 (figures 5.4.21 and 5.4.22) fails to go back to its initial position
when the clutch pedal is released
There is no clearance between the
main cylinder piston and piston follower
Adjust the clearance between main cylinder
piston and piston follower according to clause
5.4.2.12 “Operation 31. Check / adjustment of
clutch control”
There is no clearance between operat-
ing cylinder rod 25 (figure 5.4.21 and
5.4.22) and hydraulic booster 28 push
rod 27.
Adjust the clearance according to clause
5.4.2.12 “Operation 31. Check / adjustment of
clutch control”
Sticking (fails to go back to its initial position) of
the main cylinder 11 piston 10 (figure 5.4.21) due
to piston cup and O-ring expansion, resulting in
closure of compensating port “
А
” (figure 6.1.1) in
cylinder manufactured by OJSC “Gidroprivod”.
Sticking (fails to go back to its initial position) of
the main cylinder 11 piston 10 (figure 5.4.22) due
to piston cup and O-ring expansion, resulting in
closure of compensating port “
А
” (figure 6.1.2) in
cylinder manufactured by “FENOX”.
Blocking of the main cylinder piston
due to piston cup expansion
Use of incorrect hydraulic-brake fluid or in-
gress of mineral oil, petroleum, kerosene, die-
sel fuel into hydraulic-brake fluid. Rinse the
hydraulic drive system with hydraulic-brake
fluid. Replace damaged cups and O-ring in the
main and operating cylinders. Replace hydrau-
lic-brake fluid. Bleed the hydraulic system with
hydraulic-brake fluid
Hydraulic cylinder piston strokes are
carried out with difficulty
Replace the hydraulic push rod
Clogging of compensating port “A” (fig-
ure 6.1.1 or 6.1.2) in the main cylinder
Unclog the compensating port of main cylinder
and bleed the hydraulic system of clutch control
Loss of pullback spring power 32 (fig-
ures 5.4.21 and 5.4.22).
Replace the pullback spring
Full clutch lever 35 stroke can not be achieved (figures 5.4.21 and 5.4.22) when the
clutch pedal is depressed
The clearance between the main cylin-
der piston and piston follower is not
properly adjusted
Adjust the clearance according to clause
5.4.2.12 “Operation 31. Check / adjustment of
clutch control”
The clearance between operating cyl-
inder 25 rod 26 (figures 5.4.21 and
5.4.22) and hydraulic booster 28 push
rod 27 is not properly adjusted
Adjust the clearance according to clause
5.4.2.12 “Operation 31. Check / adjustment of
clutch control”
Air presence in the clutch control hy-
draulic system
Bleed the hydraulic system with hydraulic-
brake fluid
Insufficient level of hydraulic-brake fluid
in the hydraulic system reservoir
Fill hydraulic-brake fluid to the required level in
the main cylinder reservoir. Bleed the clutch
control hydraulic system
Leakage of work space of the main and
operating cylinder due to damage, wear
of cups or O-rings
Replace cups or O-rings in the main and op-
erating cylinder in case they are worn out.
Check, if the cylinder bearing surface has
sharpened edges, ridges, or pits. Bleed the
clutch control hydraulic system
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