1523.5-0000010 OM
186
End of Table 6.8
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
Faulty location of the pressure
regulator adjusting cap
Adjust the pressure regulator
Damaged rubber parts of pressure
regulator, spring shrinkage
Replace damaged parts or send them to a repair
workshop
Tilting, deadlock of spool of the
pressure regulator adjusting part
Provide freedom of the spool movement, lubricate
it or send the pressure regulator to a repair work-
shop
Pressure regulator gets actuated frequently (engages the pneumatic compressor)
without air bleeding from the receiver tank
Air leakage from the pneumatic
system or pressure regulator, fail-
ure of the back-pressure regulator
Detect the reason and stop air leakages
Pressure regulator operates in the mode of pressure-relief valve
Pressure regulator adjusting cap is
turned for a big value
Adjust the pressure regulator
Pressure regulator dummy piston
jamming
Disassemble the pressure regulator and eliminate
jamming
Clogged outlet ports in the pres-
sure regulator adjusting cap
Unclog outlet openings
There is no air feeding in the connecting hose through air bleeding valve of pres-
sure regulator
Insufficient sinking of air bleeding
valve rod in the pressure regulator
Screw the nut of the connecting hose on the outlet
and tighten it
Pressure regulator changes the
pneumatic compressor for idle
stroke
Decrease pressure in the receiver tank to the value
below 0.65 MPa
Ineffective operation of trailer brake
Brake valve drive got out of ad-
justment
Adjust the brake valve drive
Brake valve failure
Replace the brake valve
Failure in the trailer brake system
Eliminate the failure in the trailer brake system
Trailer brakes are slowly released
Brake valve drive got out of ad-
justment
Adjust the brake valve drive
Brake valve failure
Replace the brake valve
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 ADJUSTMENT
AND REPAIR, ARE ALLOWED AFTER THE TRACTOR GUARANTEE PERIOD TERMI-
NATION. OTHERWISE THE PRESSURE REGULATOR SHALL BE WITHDRAWN FROM
AFTER-SALES SERVICE. TO REPAIR OR ADJUST YOUR PRESSURE REGULATOR
(INCLUDING MS3) DURING TRACTOR GUARANTEE PERIOD CONTACT YOUR
DEALER!