Western Snowplows Midweight Series, Mechanic'S Manual

Page: 99 / 104

Lit. No. 48163, Rev. 00 March 15, 2016
99
TROUBLESHOOTING
7. Proceed through the steps of the flow chart:
PUMP PRESSURE TEST
1. Lower blade to the ground, place the control in
FLOAT mode and fully collapse the lift ram.
2. Carefully disconnect either of the angle hoses
from the angle ram 90° fitting and install
Pressure Test Kit #56679 according to the kit
instructions.
3. Route the end of the hose with the gauge up
to the headlamp crossbar and secure it prior to
testing.
4. Tighten the hydraulic fittings to approximately
20 ft-lb.
5. Activate the appropriate angle function with
the control and read the pump relief pressure
when the blade is fully angled.
6. Refer to the Valve Locations illustrations in
the Hydraulic System Overview section of this
manual for pump relief valve locations. Adjust
the pump relief valve pressure as shown in the
table.
WARNING
Keep 8' clear of the blade when it is being
raised, lowered or angled. Do not stand
between vehicle and blade or directly in
front of the blade. If the blade hits or drops
on you, you could be seriously injured.
Snowplow Type
Pump Relief
Valve Pressure
No. of Turns
Pump Relief Valve Is
Backed Off (CCW)
from Fully Seated*
Motor Amp Draw at
12.2 Volts w/Warm Oil
PRO-PLOW
®
Series 2
PRO PLUS
®
MIDWEIGHT™
2250
± 50
psi 2-1/4 to 2-1/2 turns 205 amp
* Settings are approximate.
CAUTION
Do not adjust the relief valve while it is
under pressure.
Turn the pump pressure relief valve
clockwise to increase pressure. Can the
pressure be adjusted to 2250 ± 50 psi?
Inspect the pump relief valve (same
procedure as Crossover Relief Valve
Inspection ).Repair as necessary. Can the
pressure now be adjusted to 2250 ± 50 psi?
Adjust the pump
pressure to
2250 ± 50 psi.
Inspect the pump O-ring beneath the
pump. Replace it if it is damaged. Can the
pressure now be adjusted to 2250 ± 50 psi?
Replace the pump.
YES
YES
YES
NO
NO
NO