80-0000010B OM
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7.7 Possible failures of the pneumatic system and instructions for troubleshooting
A list of possible failures in the pneumatic system and instructions for their trouble-
shooting are given in Table 7.7.1.
Table 7.7.1
Failure,
external manifestation, cause
Troubleshooting
Increase of pressure in the tank is slow
Air leakage from the pneumatic
system for the following reasons:
- pipeline nuts, fitting nuts, and
coupling clamps are undertight-
ened or damaged
- rubber sealing of the coupling
head is damaged
- the coupling head O-ring nut
torque has gone loose
- dirt ingress under the coupling
head valve
- contact of the dust cover with the
coupling head valve stem
- faulty adjustment of brake valve
drive
- improper operation of pressure
regulator
- pressure regulator filter is
clogged
- pneumatic compressor is faulty
Detect leakages and eliminate them by tightening
junctions or replacing damaged parts
Replace the damaged sealing
Screw up the nut
Clean
Eliminate
Adjust the brake valve drive as specified in section
3.8.2.2 “Check and adjustment of pneumatic system
brake valve drive”
Dismount pressure regulator from the tractor and
send it to a repair workshop
Rinse the pressure regulator filter
Contact your dealer
Pressure in tank increases slowly
Pneumatic compressor is out of
order
Contact your dealer
Rapid decrease of pressure in the tank when the engine is stopped
Air leakage through coupling mem-
bers of the pneumatic system
Eliminate leakages
Rapid decrease of pressure in the tank when brake pedals are depressed
Brake valve is faulty Replace the brake valve
Increased oil injection into the pneumatic system by the pneumatic compressor
Pneumatic compressor is faulty Contact your dealer
Insufficient air pressure in the tank
Faulty positioning of the pressure reg-
ulator adjusting cap
Adjust the pressure regulator as indicated in section
3.8.3 “Check and adjustment of pneumatic system
pressure regulator“
Pneumatic compressor is faulty Contact your dealer
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