PREVOST X3-45 COMMUTER User Manual

SECTION 12: BRAKE AND AIR SYSTEM
12
DOB 1300-1556 | X3-45 Commuter PA-1648 Maintenance Manual Section 12 revised Jan 2021
5. EMERGENCY AIR SYSTEM FILL VALVES
The vehicle is equipped with three (3) air system
emergency fill valves to supplement the air
system when air pressure is low and the engine
cannot be operated.
Air system emergency valves are fitted with
either standard tire valve stem (Schrader) and
pneumatic quick coupling fitting.
Air fill valves are as follows:
1- One quick coupling fitting and one air fill
valve fitted with standard tire valve stem
located near the engine air filter supply air for
all systems through the wet tank.
FIGURE 4: AIR FILL VALVE NEAR THE ENGINE AIR
FILTER
2- One air fill valve fitted with standard tire
valve stem located in the front service
compartment supplies air for the accessories,
secondary, wet, kneeling and parking brake
overrule tanks.
FIGURE 5: AIR FILL VALVE IN FRONT SERVICE
COMPARTMENT
3- One quick coupling air fill fitting identified
AIR SUPPLY is located behind the flip down
hatch on the front bumper. It supplies air from
a tow truck for all systems through the air
dryer.
One quick coupling fitting identified BRAKE is
located behind the flip down hatch on the front
bumper. It supplies air for the operation of the
vehicle service brake from the tow truck.
FIGURE 6: CLOSE-UP VIEW OF THE FRONT BUMPER
CAUTION
Maximum allowable air pressure is 144 psi
(965 kPa).

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