PREVOST X3-45 Multiplex User Manual

Section 3
Compressor Replacement
Maintenance Manual MM-0204 Copyright 2002
Issued 08-02 ArvinMeritor, Inc. Page 13
Performance Testing
Test the vehicle air system as follows:
1. Bleed the vehicle air system reservoir gauges
down (apply brakes several times) to
approximately 85 psig.
2. With the engine running at full governed
speed (no load, no air accessories being used),
the compressor should reach governor cutout
pressure, then unload.
If the compressor does not reach governor
cutout pressure, check for air leaks in the
system. If reservoir volume and engine RPM
are per original vehicle manufacturer’s
specifications, system plumbing leakage must
be checked and, if necessary, repaired. See air
system leakage test procedures which follow.
If the compressor fails to unload, verify proper
governor operation.
Air System Leakage Test
(Conforms to North American Uniform Roadside
Inspection Criteria)
1. Park the vehicle on a level surface. Apply the
parking brakes. Disconnect any attached or
towed vehicles (semi-trailer, full trailer, dolly,
etc.). Leave engine on.
2. Chock the tires.
3. Release the parking brakes.
4. With the compressor in pumping mode,
engine at idle and service brakes fully applied
gauge must stay between 80-90 psi or
gradually rise.
If pressure is not maintained (pressure drops)
there is an air leak in the system.
Listen for air leaks. Soapy water or high
frequency acoustic detectors may be used to
detect any leaks. Make the necessary repairs.

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