Western MVP PLUS Series User Manual

Lit. No. 27366, Rev. 01 February 15, 2008
23
RELIEF VALVES
When all cartridge valves are closed,
hydraulic fluid is trapped in the ram
by the solenoid cartridge valves,
check valves, base-end relief valves
and rod-end relief valves.
When the snowplow contacts an
object while plowing, force of the
impact increases hydraulic pressure
in the base end of the ram. When
pressure exceeds 4600 psi, the ram's
base-end relief valves open, allowing
hydraulic fluid back to the reservoir.
The rod-end check valve allows fluid
to fill the rod end of the ram.
SYSTEM OVERVIEW – HYDRAULIC
PS
B
Base-End
Relief Valves
C
Pump Relief Valve
Pressure
Test Port
DS
A
Rod-End
Relief Valves
PS
DS
A (Qty 2)
B (Qty 4)
C (Qty 1)
1-1/4
1-1/4
2-1/2
3700
4600
2250*
Relief
Valve
Approx.
Pressure
(psi)
# of Turns
Out (ccw)
from
Fully Seated
* See the Pump Pressure Test
Section for details.
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.
NOTE: Relief valves B and
components are not interchangeable
with A and C. See Relief Valve
Inspection and Adjustment Section
for service.
NOTE: See "Striking an Object
While Plowing" Schematics for
Details.

Western MVP PLUS Series Specifications

General

Brand	Western
Model	MVP PLUS Series
Category	Snow Blower
Language	English