PREVOST X3-45 Multiplex User Manual

Section 2
Troubleshooting
Copyright 2002 Maintenance Manual MM-0204
Page 6 ArvinMeritor, Inc. Issued 08-02
No air delivery
Low air delivery
Low air pressure
Discharge line blockage Check for freeze up in the discharge line.
Check low spots and eliminate any traps in the discharge line.
Inspect and repair compressor discharge port and clear any line
restrictions. Replace damaged lines as necessary.
Check for carbon build-up. If carbon has built up, make sure
cooling lines are not kinked or restricted. If carbon has built up in
the discharge line, replace the line.
Inlet line kinked or restricted Inspect the compressor air induction line for kinks and
restrictions. Repair or replace as necessary.
Governor malfunction or
misadjustment
Check for proper loader/unloader cycles of compressor.
Refer to vehicle manufacturer’s manual for governor
maintenance and troubleshooting procedures.
External contamination Replace broken, defective or dirty air filters. Clean contaminants
from surface of compressor.
Air dryer purge valve stuck open
or leaking
Check for air dryer malfunction. Refer to air dryer manufacturer’s
service instructions.
Chafed or worn discharge line Replace faulty sections of discharge line.
Loose or leaking air line
connections
Verify all connections are secure.
Tighten to vehicle specifications where necessary.
Inspect port threads for damage. If damage is extensive, replace
cylinder head.
Damage to compressor valves
and/or valve seats
Replace the cylinder head.
Leaking or malfunctioning
internal pressure relief valve
Replace the cylinder head.
Noisy air compressor Loose drive hub
Loose accessory drive coupling
Check fit of drive coupling.
Ensure hub is completely seated and crankshaft nut is tight.
Inspect crankshaft for damage — replace compressor if
crankshaft is damaged.
None of the above, but condition
persists
Replace the compressor.
Broken connecting rod
or crankshaft
Oil starvation to crank pin or
front main bearing
Check oil pressure. Verify oil passage is free of obstructions.
Make necessary repairs.
Failed power steering pump Verify power steering pump is in proper operating order. Refer to
the component manufacturer’s service instructions.
All of the above Replace compressor.
Table A: Compressor Troubleshooting Guide (Continued)
Condition Possible Cause Solution

PREVOST X3-45 Multiplex Specifications

General

Length	45 ft
Width	102 in
Engine	Volvo D13
Horsepower	500 hp
GVWR	54, 000 lbs
Height	146 in
Sleeping Capacity	Varies based on floor plan
Water Capacity	Varies based on floor plan