PREVOST X3-45 COMMUTER User Manual

SECTION 22: HEATING AND AIR CONDITIONING
12
DOB 1300-1556 | X3-45 Commuter PA-1648 Maintenance Manual First release Oct 2020
3.6 COMPRESSOR BELTS
3.6.1 Belt Replacement – Central System
DANGER
Set the main battery disconnect switch to the
OFF position. For greater safety, set the
engine rear starter selector switch in the
engine compartment to the OFF position.
1. Open engine compartment rear door and
locate A/C compressor drive belt tensioner.
Loosen tensioner screw to release belt
tension.
2. Remove the radiator fan drive belt (refer to
Section 05 COOLING).
3. Slip the old compressor belts off and the
new ones on.
NOTE
Both belts must always be replaced
simultaneously to ensure an equal distribution
of load on each of them.
Twin BX71 belt proper tension
New: 90-100 lbs
Used: 75-85 lbs
Belt tension Tool:7770002
FIGURE 13: STANDARD BELT LAYOUT WITH CENTRAL
HVAC SYSTEM
NOTE
Belts specifications may vary. For proper belt
selection, always consult your vehicle Coach
Final Record.
MAINTENANCE
A/C compressor drive belt
Clean belt tension, inspect for cracks or
frayed material at the intervals specified in the
Lubrication & Servicing Schedule in Section
24A.
3.6.2 Belt Tension Adjustment – Central
System
On the mechanical tensioner (Figure 14), slightly
slack lock bolt (A). Adjust tension by turning
adjustment screw (B). Tighten the lock bolt (A)
to preserve adjustment.
TORQUE: 43 lb-ft (58 Nm)
Should the idler bearing need to be serviced,
tighten shoulder bolt (C) at reassembly.
TORQUE: 31.5-38.5 lb-ft (43-52 Nm)
(M12 shoulder bolt)
TORQUE: 59 lb-ft (80 Nm)
(M12 x 1.75 std bolt)
22381
FIGURE 14: TENSIONER ON CENTRAL A/C

PREVOST X3-45 COMMUTER Specifications

General

Engine	Volvo D13
Transmission	Allison B500
Fuel Type	Diesel
Length	45 ft (13.7 m)
Width	102 in (2.6 m)
Horsepower	500 hp
GVWR	54, 000 lbs
Height	141 in