Manitowoc Grove CD3340B User Manual

HYDRAULIC SYSTEM CD3340B/YB4411
4-28
Published 04/07/2015 Control # 569-00
Table 4-8
Counterbalance Valves
The vertical (jack) outrigger cylinders have load-holding
(counterbalance) valves installed in the base of the cylinder.
The purpose of these valves is to inhibit the cylinder from
retracting if a hydraulic hose breaks. The counterbalance
valve will hold the oil in the base of the cylinder until there is
sufficient oil and pressure from the pump available to the rod
side of the cylinder.
Oil flows freely through the counterbalance valve and into
the cylinder base end when the cylinder is being extended.
To retract the cylinder, oil is sent to the rod port of the
cylinder. As the cylinder starts to retract, the piston meets
resistance from the oil held in the cylinder base end by the
counterbalance valve. Pressure increases as the pump tries
to overcome the resistance.
Port
Function
(Under High Pressure)
Sol. Wire
A Left Front Outrigger Up A J21
B Left Front Outrigger Down B J4
C Left Front Outrigger In A J17
D Left Front Outrigger Out B J24
E Right Front Outrigger In A J15
F Right Front Outrigger Out B J25
G Right Front Outrigger Up A J34
H Right Front Outrigger Down B J3
I Left Rear Outrigger Down A J20
J Left Rear Outrigger Up B J10
K Left Rear Outrigger In A J32
L Left Rear Outrigger Out B J1
M Right Rear Outrigger In A J31
N Right Rear Outrigger Out B J18
O Right Rear Outrigger Down A J14
P Right Rear Outrigger Up B J33
FIGURE 4-15
a0663
Reference Only

Manitowoc Grove CD3340B Specifications

General

Brand	Manitowoc
Model	Grove CD3340B
Category	Construction Equipment
Language	English