View Full Version : Bleeding air out of Western Uni mount
11-24-2009, 12:29 AM
my lift ram seems to have air in it and operating it up and down isnt getting it out how do i get the air out??
11-24-2009, 11:12 AM
I would check the fluid.
1. Perform this operation with the plow attached to
the truck on a hard level surface.
2. Lower the blade to the ground.
3. Active control float function and manually collapse
lift ram all the way. Turn control off.
4. Remove the reservoir fill plug (behind the motor)
and the fluid level plug (on the driver-side front
corner of the reservoir).
5. Fill the reservoir through the reservoir fill hole until the
fluid runs out of the fluid level hole. Replace both
If it was me, I would change the fluid and start from there.This is call "annual fluid change"
1. Follow steps 1–4 of Fluid Level Check from the
2. Remove the drain plug located at the bottom of
the left front corner of the reservoir. Drain fluid into
drain pan or suitable container.
3. Completely drain reservoir and replace drain plug.
4. Remove the angle ram hoses from the fittings on
the hydraulic unit and place in a drain pan or
suitable container. (See Hose or Fitting
Replacement on the next page.)
5. Manually angle the blade fully in each direction to
remove fluid from the angle rams. Do not allow the
hose from the extending ram to take fluid back in.
6. Reconnect the angle ram hoses to the proper
Change fluid at the beginning of each plowing
season. Failure to do so could result in
condensation buildup during non-snowplow
"Do not mix different types of hydraulic fluid.
Some fluids are not compatible and may cause
performance problems and product damage.
7. Fill reservoir through fill hole until the fluid runs
out of the fluid level hole with WESTERN® High
Performance Hydraulic Fluid to -40°F (-40°C), or
other fluid conforming to Military Specification
MIL-H-5606A, such as Mobil Aero HFA or Shell
AeroShell® Fluid 4.
Replace both plugs.
8. Activate control and angle blade fully to the left
and right several times to remove air from angle
9. Turn off control and refill reservoir through
reservoir fill hole until the fluid runs out of the fluid
level hole. Replace both plugs.
10. Activate control and raise and lower plow several
times to remove air from lift ram. Activate control
float function and manually collapse lift ram all the
way after each lowering of the blade. Turn control
11. Recheck fluid level with lift ram fully collapsed.
The fluid I use is "Snow plow oil Hydraulic Fluid".I brought my from Auto Zone. Usually auto parts store have it, Or were I live, a place call "Tractor Supplies" also carried it. Here is the web link I gather this information.
look at page #'s 24 &25
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