© 2018 Pierce Manufacturing Inc. All Rights Reserved.
General Operation / 5-11
OPERATION
5-4.
Cab Tilt Operation
Pierce Custom Chassis may be equipped with one of three types of cab tilt systems.
•
The
Type I
system includes a lever-operated hydraulic valve to change the direction of the fluid flow to the lift
cylinders in conjunction with a two-position toggle switch (ON-OFF) to operate the electric pump.
•
The
Type II
system has two momentary switches (Lock Release & Activate) with a Raise/Lower switch.
•
The
Type III
system has a momentary hand-held switch, on a coiled tether, with a Raise/Lower switch.
Every tilt cab has a mechanical means of supporting the cab once it has been tilted. Some models employ a stay
arm that must be positioned manually. Other models incorporate a locking channel as part of one of the lift cylinders.
Remove all loose items from the cab compartment before tilting as contents may shift or drop causing
property damage or personal injury.
Never work around or under a tilted cab unless the stay arm or mechanical support is secured in the
support position. Hydraulic cylinders can leak or drift and cannot be relied upon to support the cab on
their own. Failure to ensure that the stay arm is securely in its support position could cause severe
personal injury or death.
Check front bumper extension to ensure that covers are shut and plumbing swivels are rotated forward
before tilting cab to avoid possible interference and subsequent property damage when cab is fully
tilted.
Always ensure that the vehicle is on a flat and level surface before tilting the cab. Tilting the cab on an
inclined or non-flat surface may produce interference between components as the cab is lowered
causing damage to the air intake seal and engine tunnel.
If the cab fails to lower after following the proper instructions, do not attempt to force it. Have the
system checked by a qualified mechanic, refer to
section of this manual, and the Cab section of the Service manual.
Do not operate the air conditioning with the cab up.
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