Lit. No. 30118, Rev. 00
June 15, 2020
57
STRIKING AN OBJECT WHILE BACK DRAGGING – HYDRAULIC
System Response
1. Hydraulic
fl
uid is trapped in the rod end of the
driver-side ram by the inactivated S4 solenoid
cartridge valve and the RV3 rod-end relief
valve.
2. Hydraulic
fl
uid is trapped in the rod end of
the passenger-side ram by the inactivated
S3 solenoid cartridge valve and RV4 rod-end
relief valve.
3. When the snowplow contacts an object while
back dragging, force of the impact increases
hydraulic pressure in the rod end of the ram.
When the pressure exceeds 1150 psi, the
ram's rod-end relief valve opens (RV3 on the
driver's side, RV4 on the passenger's side),
allowing
fl
uid to
fl
ow into the ram's base end.
4. Because of di
ff
erential volume on either side
of the ram's piston,
fl
uid is drawn from the
reservoir through CV4 (on the driver's side) or
CV3 (on the passenger's side) to the base end
of the ram.
PRIMAR
Y
MANIFOLD
SECONDARY MANIFOLD
LIFT RAM
RAISE
LOWER
RV2
S4
RV1
LEFT BASE
LEFT ROD
RV3
RV5
CV4
CV1
PC1
RV4
RV6
PC2
CV2
CV3
S3
SV5
S5C2
S5C1
S6
S6C1
S6C2
CV5
INTERFACE
INTERF
ACE
T
PUMP
TANK
S1
CV6
S2
SV4
RIGHT ROD
RIGHT BASE
