Workman HDX Auto Page 7 − 13 Hydraulic System
High Flow Hydraulic Circuit
On Workman HDX Auto vehicles that are equipped with
high flow hydraulics, a second gear pump section is di-
rectly coupled to the standard gear pump. This second
pump section provides hydraulic system flow for the high
flow circuit that is designed to power hydraulic attach-
ments. A hydraulic manifold equipped with a solenoid
operated relief valve (SVRV) is used to control the ac-
cessory circuit and when energized, also provides circuit
relief. A dash mounted rocker switch is used to energize
the solenoid to engage the circuit. The high flow circuit
includes quick disconnect couplers for attachment con-
nection and an oil cooler. Vehicles with high flow hydrau-
lics require more hydraulic oil in the reservoir for correct
system operation.
High Flow Circuit OFF (Fig. 11)
When the rocker switch is in the OFF position, the hy-
draulic manifold solenoid operated relief valve (SVRV)
is not energized. Flow from the gear pump is routed
through the manifold, the oil cooler, the oil filter and then
returns to the reservoir.
High Flow Circuit ON (Fig. 11)
When the rocker switch is in the ON position, the man-
ifold solenoid operated relief valve (SVRV) is energized.
The energized solenoid valve directs gear pump oil flow
to the hydraulic attachment. Circuit pressure is limited to
2000 PSI (138 bar) by the manifold solenoid relief valve
(SVRV). Return oil from the attachment is routed
through the oil cooler, the oil filter and then returns to the
reservoir.
Figure 11
ENERGIZED
SWITCH IN
ON POSITION
HYDRAULIC
ACCESSORY
MOTOR
HYDRAULIC
MANIFOLD
ROCKER
0.519 in3/rev
GEAR PUMP
T
COOLER
OIL
2000
PSI
DISCONNECT
COUPLINGS
7.7 GPM
QUICK
SVRV
TO OIL
FILTER
21
Hydraulic
System
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