OPERATION
5-12 / General Operation
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5-4.1 Cab Lift System
To Raise Cab
1. Before tilting the cab, ensure that the vehicle is on a flat and level surface, parking brakes are set, loose items
in cab are secure, and there are no obstructions in the tilt path.
2. Ensure that the battery and ignition switches are “ON.”
3. Locate the cab lift controls (location varies depending on chassis model).
4. Rotate the control lever on the valve to the RAISE position (valve not present on some models).
5. Activate the lift pump toggle switch and hold until the cab is fully tilted.
6. Release the stay arm from its stowed position and secure the stay arm in its support position.
7. Rotate the control lever on the valve to the lower position and allow the cab to settle onto the stay arm support.
8. Return the control lever to the raise position to hydraulically lock the cylinders in place.
To Lower Cab
1. Rotate the control lever on the valve to the RAISE position.
2. Operate the toggle switch to raise the cab and relieve pressure on the stay arm.
3. Return the stay arm to the stowed position.
4. Rotate the control lever on the valve to the LOWER position.
5. Leave the control lever in the LOWER position for road operation. Cab locks will engage automatically.
6. Check to ensure the cab is fully seated and latched before operating vehicle.
5-4.2 Manual Pump Operation (Optional)
If the chassis is equipped with a manual pump option, the tilt pump can be operated by hand in the event that power
is lost on the vehicle. Locate the pump handle and insert it in the tube at the pump pivot. Use the same procedures
as listed above but with the following exceptions:
Operate the hand pump in place of moving the toggle switch to the RAISE position. Operate the hand pump rapidly
for the first few strokes so that the fluid flows rapidly enough to close the internal system bypass valve.
Locate the small push button at the end of the descent valve solenoid on the hydraulic power unit. Turn this button
counterclockwise and pull out in place of moving the toggle switch to the LOWER position. To raise the cab, this
button must be pushed in and rotated clockwise.
Always check for people working on or around the cab before raising or lowering the cab. Failure to
ensure that everyone is clear of the cab could cause severe personal injury or death.
Do not overtighten the flow control valve. Overtightening could cause the valve not to function
properly, and cause the cab not to tilt or lower as desired.
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