Belarus 892 - Page 293

892-0000010B OM
293
Table 7.7.1 finished
Defect, external manifestation, cause Troubleshootin
g
Pressure regulator switches on controller to idle run at pressure less than
0.77...0.80 MPa, and to o
p
eration mode — at less than 0.65 MPa or over 0.70 MPa
Staining of cavities and ducts of pressure
regulator
Wash and clean them
Faulty location of pressure control valve
adjusting cap
A
djust pressure control valve as specified in
subsection 3.8.3 «Check and adjustment of
pneumatic s
y
stem pressure control valve»
Breakage of rubber parts, spring shrinkage Replace damaged parts, or refer pressure reg-
ulator to re
p
air.
Skewness, hang up of controller regulating
section
Secure valves mobility, put grease, if required, or
refe
r
p
ressure re
g
ulato
r
to re
p
ai
r
.
Pressure regulator is often actuated (switches compressor on) without air in-
take from the receive
r
Air leakage from pneumatic system or pres-
sure regulator, or damage of the controller
check valve
Find out and eliminate air leakage
Re
g
ulator o
p
erates in the safet
y
valve mode
A
djusting cover of the regulator is screwed
up to great value
Adjust pressure regulator as indicated in
subsection 3.8.3 «Check and adjustment of
pneumatic system pressure control valve»
Jamming of discharge piston of the dia-
phragm unit
Disassembly pressure controller and elimi-
nate jamming
Cover outlet openings are clogged
Clean outlet openings.
No air supply to connecting hose via air bleed off valve
Rod of air bleed off valve in the pressure
controller is not sunk enough.
Screw up connecting hose nut to the
coupling to the full
Pressure controller has switched
com
p
ressor over to idle run .
Reduce cylinder pressure to below 0.65 Mpa.
Trailer brake are slowl
y
released
Brake valve actuator got out of adjust-
ment
A
djust brake valve actuato
r
as indicated in
clause 3.8.2.2 «Check and adjustment of brake
valve actuator of tractor pneumatic s
y
stem»
Brake valve failure Replace brake valve
Failure of trailer brake system Correct trouble in trailer brake system
Trailer brake are slowl
y
released
Brake valve actuator got out of adjust-
ment
A
djust brake valve actuato
r
as indicated in
clause 3.8.2.2 «Check and adjustment of brake
valve actuator of tractor pneumatic system»
Brake valve failure Replace brake valve
Failure of trailer brake system Correct trouble in trailer brake system
ATTENTION: WHILE PNEUMATIC SYSTEM TROUBLESHOOTING ALL SELF-
MAINTAINED OPERATIONS RELATED TO PRESSURE CONTROL VALVE ADJUST-
MENT AND REPAIR, ARE ALLOWED AFTER THE TRACTOR GUARANTEE PERIOD
TERMINATION. OTHERWISE PRESSURE CONTROL VALVE WILL BE WITHDRAWN
FROM AFTER-SALES SERVICE. TO REPAIR OR ADJUST YOUR PRESSURE CONTROL
VALVE (INCLUDING MS3) DURING TRACTOR GUARANTEE PERIOD CONTACT YOUR
DEALER!