HYDRAULIC SYSTEM CD3340B/YB4411
4-22
Published 04/07/2015 Control # 569-00
OUTRIGGERS CIRCUITS
General
The front outrigger valve consists of a manifold, relief valve,
and five solenoid valves. The fifth solenoid valve is used to
control the optional under deck winch.
Two outrigger hydraulic systems are available on the crane:
1. Standard controlled outriggers.
2. Optional independently controlled outriggers.
Standard Outrigger Hydraulic System
The standard outrigger hydraulic system (Figure 4-10 and
Figure 4-11) includes a priority flow control valve, an
accumulator charging valve, a dump valve, a four solenoid
outrigger valve, four horizontal outrigger cylinders and four
vertical outrigger cylinders and the hydraulic lines.
Optional Independently Controlled Outrigger
Hydraulic System
The optional independently controlled outrigger hydraulic
system (Figure 4-12 and Figure 4-13) includes a priority flow
control valve, an accumulator charging valve, a dump valve,
two four solenoid outrigger valves, four horizontal outrigger
cylinders, and four vertical outrigger cylinders and hydraulic
lines.
Oil Flow
See Figures 4-10 through 4-13 for the following procedure.
Hydraulic oil from the pump flows through the priority flow
control valve, through the accumulator charging valve to the
dump valve. The dump valve is a normally open valve. When
hydraulic oil reaches the valve it flows through it back to tank.
When the outrigger switch is actuated in the cab it energizes
the dump valve and closes it, allowing oil to flow to the
outrigger valve. Depending upon which outrigger function is
actuated, the oil flows though the outrigger valve to the
outrigger cylinders. The cylinder extends or retracts and
pushes oil ahead of the piston through one of the ports of the
cylinder. The oil returns to the outrigger control valve and
back to tank through the return filter.
Reference Only
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