Labrie Pendpac WITTKE RETRO FL, Maintenance Manual

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Maintenance
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1. Hopper Top Door Circuit: The hopper top door circuit includes one double-acting hydraulic
cylinder and two flow restrictors.
2. Tailgate Circuit: The tailgate circuit consists of two double-acting hydraulic cylinders, two lock
valves and two flow restrictors.
3. Arms Circuit: The arms circuit consists of two double-acting cylinders and a deceleration valve.
4. Forks Circuit: The forks circuit consists of two double-acting cylinders.
5. Pack/Return Circuit: The pack circuit consists of two double-acting, 3-stage cylinders, a pilot-
operated check valve, and a pressure switch.
Work Circuits (Residential)
The residential valve bank work circuits are identical to the commercial work circuits shown above
with one exception: the top circuit on the residential unit is the Cart Tipper circuit. The remaining
circuits follow in the same order as the commercial work circuits.
N
OTE
:
The cart tipper is optional, and therefore, this circuit may not appear on your vehicle.
Work Circuits (Tip-to-Dump)
The Tip-to-Dump work circuits are identical to the commercial work circuits shown above with one
exception: the top circuit on these units is the Hoist circuit. The remaining circuits follow in the same
order as the commercial work circuits.
Arms Up Deceleration Valve
The arms up deceleration valve (see Figure 3-39) automatically decelerates the arms as they are
raised to the dump position. A cam bolted to the arm pivot tube rotates as the arms are raised and
gradually depresses the valve spool, reducing the flow of oil exiting the tube end of the arm cylinders.
Figure 3-39 Deceleration valve
N
OTE
:
The deceleration valve greatly reduces impact on the arm assembly, body structure, and
hydraulic components.
Location: Fitted to the underside of the body, behind the arm pivot tube on the curbside.