PREVOST X3-45 COMMUTER User Manual

SECTION 05: COOLING SYSTEM
16
DOB 1300-1556 | X3-45 Commuter PA-1648 Maintenance Manual First release Oct 2020
NOTE
Watch out for accidental contamination!
Hand vacuum pump should be used for
coolant sampling only to prevent cross-
contamination.
Also, ensure cleanliness throughout this
procedure to make sure the coolant sample is
not contaminated accidentally.
Sampling should be performed on the surge
tank, on a cold engine.
If the vehicle has been standing still for a
significant period, drive it around 30 min up to
normal operating temperature. Then let it cool
down.
1. Release the surge tank pressure using the
pressure relief valve (Figure 2).
2. Pull the pressure cap off the surge tank.
3. Thread the sample bottle to the pump. Hand
tightens.
4. Slide the plastic tubing in the fitting on the
pump until it exceeds about 1/2 inch into
pump cavity.
5. Insert tube in the surge tank about half way to
the bottom. (Do not draw sample in the
bottom of the surge tank.)
6. Pump until sample bottle is about 2/3 full. Do
not overfill.
7. Loosen pump fitting to remove tube from
pump. Allow any coolant in the tube to flow in
the bottle.
8. Remove sample bottle and install cap.
9. Throw plastic tube away. (Not to be re-used)
10. Complete any forms required by the
laboratory.
7. DRAINING COOLING SYSTEM
Use the following procedures to drain the cooling
system partially or completely.
To drain engine and related components:
1. Stop engine and allow engine to cool. Close
both heater line shutoff valves.
The valves are located in the engine
compartment. One is located under the
turbocharger inlet pipe in the lower L.H side of
the engine compartment; another valve is
located behind the L.H. tag axle wheel and is
accessible by lifting the hinged rear wheel fender
and removing the access panel behind it (Figure
19).
MAINTENANCE
Cooling system
Drain, flush, thoroughly clean and refill the
system
at the intervals specified by the
Lubrication And Servicing Schedule in Section
24: LUBRICATION & SERVICING.
WARNING
Bef
ore proceeding with the following steps,
make sure the coolant has cooled down. The
sudden release of pressure from a heated
cooling system can result in loss of coolant and
possible personal injury (scalding) from the hot
liquid.
2. Close the shut-off valve on the coolant filter
mounting head and remove filter (perform
only if filter as to be replaced).
3. Open the shut-off valve on the coolant filter
mounting head and drain the coolant into a
suitable container. Close the shut-off valve.
4. Release the pressure using the pressure
relief valve and remove the pressure cap.
CAUTION
N
ever open the surge tank pressure cap
without making sure first that the system is
completely depressurized.
Coolant under
pressure (hot or not) may cause serious
injuries and eyes damages.
5. Connect coolant extractor (Figure 20). Use
coolant extractor to drain the coolant from
the engine. An alternate method is to drain
the coolant into a suitable container using
the drain hose.

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