Hiniker DB1474A, Руководство по обслуживанию

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Introduction
VEE MODE OF OPERATION
Operating the Vee switch energizes the S2 sole-
noid valve and the S6 solenoid valve. An exten-
sion spring on the moldboard forces hydraulic
fluid, not under pressure, from the left wing cyl
-
inder through the S2 solenoid valve back to the
reservoir as the cylinder retracts. Likewise, hy-
draulic fluid, not under pressure, is forced from
the right wing cylinder through the S6 solenoid
valve to the reservoir as the cylinder retracts.
Releasing the Vee switch de-energizes the S2
and S6 solenoid valves.
SCOOP MODE OF OPERATION
Operating the Scoop switch energizes the 12
VDC motor, the S1 solenoid valve and the S5
solenoid valve. Hydraulic fluid under pressure is
then directed through the S1 solenoid valve and
a one way check valve (CV1) to the left wing
cylinder. Hydraulic fluid under pressure is also
directed through the S5 solenoid valve and a
one way check valve (CV3) to the right wing cyl-
inder.
Releasing the Scoop switch de-energizes the 12
VDC motor, the S1 solenoid valve and the S5
solenoid valve. The one way check valves, CV1
and CV3, maintain hydraulic pressure in their re-
spective wing cylinders.
The left wing circuit is protected by a pressure
relief valve (RV1) and the right wing circuit is
protected by another pressure relief valve (RV2).
Both are set to relieve system pressure at 2700
PSI. Typically, pressure is relieved when the wing
cylinders reach their fully extended position.