PREVOST X3-45 Multiplex User Manual

Section 2
Troubleshooting
Maintenance Manual MM-0204 Copyright 2002
Issued 08-02 ArvinMeritor, Inc. Page 5
Section 2Troubleshooting
Use the following chart to troubleshoot the Meritor WABCO System Saver 636 twin cylinder air
compressor.
NOTE: If you have any questions or need additional information, please contact the Meritor WABCO
Customer Service Center at 866-668-7221.
Table A: Compressor Troubleshooting Guide
Condition Possible Cause Solution
Compressor passes
excessive oil
(for example, the
presence of oil at
exhaust air brake system
valves, oil in air dryer
dessicant, etc.)
Blocked or restricted oil return Clean oil drain passages in the compressor and on the engine
surface. Verify proper passage alignment.
Contaminated inlet air or oil Replace damaged, defective or dirty engine air filter.
Repair any leaking, damaged or defective compressor air intake
components.
Change engine lubricating oil.
NOTE: To avoid this condition, make sure vehicle
manufacturer’s oil and filter maintenance schedules are
followed.
Restricted air inlet or excessive
vacuum present at compressor
inlet
Verify engine air cleaner is functioning properly. Replace if
necessary.
Repair compressor air inlet kinks or excessive bends.
Check vehicle specifications to ensure air and coolant lines meet
all requirements.
Excessive engine crankcase
pressure
Verify engine crankcase venting is to manufacturer’s
specification.
Compressor duty cycle too high Check system for leaks. Make necessary repairs.
None of the above, but condition
persists
Replace the compressor.
Compressor leaks oil Physical damage or internal
problems with compressor
Replace the compressor.
Compressor
continuously cycles
Compressor unloader piston
leaking
With compressor unloaded check for air leakage. If leaking,
replace the cylinder head.
Governor air leak Refer to the manufacturer’s manual for governor maintenance
and troubleshooting procedures.
Dryer purge valve air leakage Check for air dryer malfunction. Refer to air dryer manufacturer’s
service instructions.
Air leak at governor-compressor
attachment.
Inspect connection for physical damage. Inspect and repair
connection.
Air leak at alcohol injector Clear line of any obstructions.
Inspect and repair connection.
Excessive reservoir
contamination
Drain reservoirs.
None of the above, but condition
persists
Replace the compressor.

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