82.3-0000010 OM
221
End of Table 6.7.1
Failure,
external manifestation, cause
Troubleshooting
Pressure regulator engages compressor for idle stroke when pressure is below 0.77...0.80
MPa, and for operating stroke when pressure is below 0.65 MPa or over 0.70 MPa
Dirt accumulation in cavities and
channels of pressure regulator
Rinse and clean the pressure regulator
Position of the pressure regulator
adjusting cap is disturbed
Adjust the pressure regulator
Rubber parts of the pressure regu-
lator
are damaged, springs are
shrunk
Replace damaged parts or send them to a repair
workshop
Tilting, sticking of spool of the
pressure regulator adjusting part
Provide freedom of the spool movement, lubricate it
or send the pressure regulator to a repair workshop
Pressure regulator gets actuated frequently (engages the pneumatic compressor)
without air takeoff from the receiver
Air leakage from the pneumatic
system or the
damage to
the backflow valve of
pressure regulator
Detect and stop air leakages
Pressure regulator operates in the mode of safety valve
Pressure regulator adjusting cap is
turned for a big value
Adjust the pressure regulator
Jamming of pressure regulator
dummy piston
Disassemble the pressure regulator and eliminate
jamming
Outlet openings in the pressure
regulator adjusting cap are
Clean the outlet openings
There is no air delivery into connecting hose through air takeoff valve of
pressure regulator
Insufficient sinking of air takeoff
valve rod in the pressure regulator
Screw the nut of the connecting hose onto the fit-
ting and tighten it
Pressure regulator changes the
pneumatic compressor for idle stroke
Decrease pressure in the receiver to the value be-
low 0.65 MPa
Ineffective operation of trailer brake
Brake valve drive is misadjusted
Adjust the brake valve drive
Failure in the trailer brake system
Eliminate the failure in the trailer brake system
Trailer brakes are released slowly
Brake valve drive is misadjusted
Adjust the brake valve drive
Failure in the trailer brake system
Eliminate the failure in the trailer brake system
ATTENTION: WHILE TROUBLESHOOTING IN THE PNEUMATIC SYSTEM, ALL
SELF-MAINTAINED OPERATIONS RELATED TO PRESSURE REGULATOR ADJUST-
MENT AND REPAIR, ARE ALLOWED ONLY AFTER THE TRACTOR GUARANTEE PE-
RIOD TERMINATION. OTHERWISE WARRANTY FOR THE PRESSURE REGULATOR
SHALL BE DENIED. TO REPAIR OR ADJUST YOUR PRESSURE REGULATOR (IN-
CLUDING MS-3) DURING TRACTOR WARRANTY PERIOD CONTACT YOUR DEALER!
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