Engine Compartment Emergency Air-Fill Valve; Series Optional Front Air Supply Connections - PREVOST H3-41 Maintenance Manual

Place the front wheels in a straight-ahead position
and keep the steering wheel from turning. To do
so, slide the driver's seat close to the steering
wheel. Wrap the safety belt around and through
the steering wheel and then fasten safety belts.
This will ensure the vehicle rolls in straight
direction to be stopped by the tow truck in case of
mechanical failure of the lifting equipment.
2.1.1

Engine compartment emergency air-fill valve

Use the emergency fill valve to supply air to the
system when the engine cannot be operated. This
valve is located in the engine compartment
(Figure23) and supplies air for all systems
(brakes, suspension and accessories).
CAUTION
Do not tow the vehicle without external air pressure applied to the emergency fill valve if the engine
does not operate. Without brake system air pressure, the emergency spring brakes may apply
automatically. If failure prevents releasing the parking brakes with air pressure, disengage the parking
brakes mechanically.
2.1.2 X Series Optional Front Air Supply Connections
Operate the engine when towing to maintain brake system air pressure. If the engine cannot be operated,
connect external air pressure lines from the tow truck.
"Brake" quick connect fitting
Flip down the access door located on the front bumper, connect an auxiliary air supply from the tow truck
to the quick connect fitting identified BRAKE in order to supply air for operation of the vehicle service
brake from the tow truck (Figure24, Figure25).
"Air supply" quick connect fitting
Writer:
FL
FIGURE 22
FIGURE 23 : ENGINE COMPARTMENT EMERGENCY AIR-
FILL VALVE
MI18-18
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