PREVOST X3-45 - Troubleshooting and Testing; Steering; Electrical System; Suspension

Technical Information 118
The solenoid control valves are maintenance
free. Their operating voltage is 24 (+4.8, -2.4)
volts DC. The rated current draw is 1.65 amps.
The thermal operating range of the solenoid
control valves is from -40 to 176°F (-40 to 80°C).
TROUBLESHOOTING AND TESTING
For troubleshooting and testing of the vehicle's
anti-lock braking system, refer to Meritor
WABCO Maintenance Manual: “Anti-Lock Brake
Systems For Trucks, Tractors and Buses" or use
dashboard Message Center Display (MCD)
Diagnostic Mode under ECU Diagnostic: “ABS”.
STEERING
• Tilt steering wheel and telescopic steering
column;
• Integral hydraulic assisted steering gear;
• System pressure: 2175 psi (150 bars).
ELECTRICAL SYSTEM
• 24 volt, negative ground;
• 12 volt exterior lighting;
• Twin 28 volt, 140 amp, self-regulated, belt-
driven, air-cooled Bosch alternators;
• Four 12 volt, group 31 format maintenance-
free batteries connected in series/parallel.
Cold cranking capacity is 1900 amps with a
reserve capacity of 195 minutes;
• 100 amp battery equalizer.
SUSPENSION
Goodyear rolling lobe type air springs (bellows)
are used throughout.
I-BEAM AXLE FRONT SUSPENSION
2 Bellows (12
");
2 Shock absorbers;
4 Radius rods;
1 Transverse radius rod;
1 Height control valve.
INDEPENDENT FRONT SUSPENSION
2 Bellows (14.5
") for a G.A.W.R. of 16,500 lb;
2 Shock absorbers;
2 Upper A-arms;
2 Lower A-arms;
2 Torque rods;
2 Steering Levers;
1 Height control valve;
1 sway bar (1¾
" diameter).
DRIVE AXLE
4 Bellows (11
");
4 Shock absorbers;
3 Radius rods;
1 Panhard rod;
2 Height control valves.
TAG AXLE
2 Bellows (11
");
2 Shock absorbers;
3 Radius rods;
1 Panhard rod.
ALIGNMENT SPECIFICATIONS
Use wheel alignment systems which work with
angle measurements only, such as Josam or
Hunter systems. Alignment specifications are
listed in the following tables:
I-BEAM AXLE FRONT SUSPENSION
Minimum
value
Nominal
value
Maximum
value
Right camber
(degrees)
-0.250 0.125 0.375
Left camber
(degrees)
-0.250 0.125 0.375
Right caster
(degrees)
2.0 2.75 3.5
Left caster
(degrees)
2.0 2.75 3.5
Total toe-in
(degrees)
0.08 0.13 0.17
FRONT AXLE
(INDEPENDENT SUSPENSION)
Minimum
value
Nominal
value
Maximum
value
Right camber
(degrees)
0.0 0.150 0.35
Left camber
(degrees)
0.0 0.150 0.35
Right caster
(degrees)
2.35 2.6 2.85
Left caster
(degrees)
2.35 2.6 2.85
Total toe-in
(degrees)
0.08 0.13 0.17