PRONAR PT512, Operator'S Manual

Page: 135 / 139

CHAPTER 5 Pronar PT512
5.39
5.13 TROUBLESHOOTING
TABLE 5.7 TROUBLESHOOTING
FAULT CAUSE REMEDY
Brake system pneumatic
lines not connected Connect brake lines (applies to
pneumatic systems)
Parking brake engaged Release parking brake.
Damaged pneumatic
system connection lines
Replace.
Leaking connections
Tighten, replace washers or seals,
replace lines.
Problem with moving off
Damaged control valve or
braking force regulator
Check the valve, repair or replace.
Excessive play in bearings
Check the play and adjust if
needed.
Damaged bearings Replace bearings
Noise in drive axle hub
Damaged hub elements Replace.
Poor efficiency of braking
system Insufficient pressure in the
system
Check pressure on tractor
pressure gauge, wait till
compressor fills tank to required
pressure.
Damaged air compressor in the
tractor. Repair or replace.
Damaged brake valve in the
tractor. Repair or replace.
Leaks in the system. Check
system for tightness
Incorrect adjustment of
main or parking brake
Adjust positions of expander arms.
Excessive heating of
drive axle hubs
Worn brake linings Replace brake shoes.
Incorrect operation of the
hydraulic system Improper hydraulic oil
viscosity
Check oil quality, make sure that
the oil in both machines is at the
same type. If necessary, change
oil in a tractor or in the trailer.