Western MVP PLUS Series User Manual

Lit. No. 27366, Rev. 01 February 15, 2008
58
STRIKING AN OBJECT WHILE BACK DRAGGING – HYDRAULIC
PRESSURE TEST PORT
DRAIN
QUILL
PUMP
RELIEF
VALVE
S10S5
S6
S4
S11
S8
S9
S3
S2
S1
RELIEF
VALVES
DS BASE
RELIEF
VALVES
PS BASE
CHECK
VALVE
DS BASE
RELIEF
VALVE
DS ROD
RELIEF
VALVE
PS ROD
CHECK
VALVE
PS BASE
CHECK
VALVE
DS ROD
CHECK
VALVE
PS ROD
DS
PS
LIFT
M
S7
SECONDARY BLOCK ASSEMBLY
PRIMARY BLOCK ASSEMBLY
FORCE APPLIED WHEN BACK DRAGGING FORCE APPLIED WHEN BACK DRAGGING
SV08-2004 S3 ON
SV08-2004 S1
MOVEMENT
BLADE
RAISE LOWER SCOOPVEE
SF08-2015 S6
EXTEND
LEFT
S4SVCV08-20 ON ON
SVCV08-20 S2 ON
SV08-2004
SVCV08-20
SVCV08-20
SV08-2004
SVCV08-20
SF08-2015
S5
S8
S11
S9
S7
S10
ON
MOTOR M ONON
ON
ON
ON
ON
ON ON
ON
ONON
ONONON
ON
ON
ONON
ONON
ANGLE
RIGHT
ANGLE
LEFT
RIGHT
RETRACT
ON
ON
ON
ON
RIGHT
EXTEND
ON
ON
ON
LEFT
RETRACT
ON
ON
ON
ON
Relief Valve Settings
Pump
Ram, Base-End
Ram, Rod-End
2250 psi
3700 psi
4600 psi
System Response
1. Hydraulic fluid is trapped in the
rod end of the PS ram by the
inactivated solenoid cartridge
valves S8, S9 & S11 and
PS rod-end relief valve and
check valve.
2. Hydraulic fluid is trapped in the
rod end of the DS ram by the
inactivated solenoid cartridge
valves S4, S5 & S7 and
DS rod-end relief valve and
check 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 pressure exceeds
3700 psi, the ram's rod-end relief
valve opens, allowing hydraulic
fluid into the reservoir passage.
The base-end check valve allows
fluid to fill the base end of the
ram. Because of differential area
on either side of the ram's piston,
fluid flows from the reservoir to
the base end.

Western MVP PLUS Series Specifications

General

Brand	Western
Model	MVP PLUS Series
Category	Snow Blower
Language	English