Troubleshooting - Blizzard Snowplow 760HD Installation And Owner's Manual

Problem
Pump will not run.
Pump will not run, power to the
solenoid.
Pump will not run with power to the
solenoid. Brown/white activation
wire and ground are properly
connected.
Pump will not turn off. Do not allow
the pump motor to run
continuously. Unplug the harness
until the solenoid can be tested or
®
a BLIZZARD Dealer can
diagnose the problem.
Pump runs but plow functions are
slow.
A-frame latch will not move.
Plow will not lift. Pump works
properly.
Plow will not lift with magnification
to the S6 coil.
Lit. No. B64090, Rev. 00

TROUBLESHOOTING

Cause
Plow harness may not be properly
connected to the vehicle harness.
Power or ground cables to the
battery, pump or solenoid may not
be properly connected.
The black ground wire and
brown/white activation wire on the
solenoid are not properly
connected.
The red, hot wire to the pump
motor is not properly connected.
Solenoid may be damaged.
Short in the control or wire
harness.
Fluid level in the pump reservoir is
low. Fluid is leaking.
System pressure may be set too
low. Increasing the pressure
excessively will increase the
amperage draw. This could
damage the vehicle harness.
Amperage from the vehicle's
alternator is too low.
Pump filter may be clogged.
Draw latch is binding the A-frame
latch.
Control station in the cab may not
be properly connected
A-frame latch is in the (down)
locked position.
Diode loop harness may be
corroded or could have failed.
Coils on the manifold may be
damaged.
Hydraulic lock in the manifold. This
occurs if the voltage is too low on
the coils –should be 10 volts.
Solenoid cartridge valve may be
contaminated.
35
Solution
Verify the harnesses are properly connected.
Properly connect all cables. Clean and lubricate with
dielectric grease. If power does not resume, check
the continuity of all cables to find the break.
Properly connect both cables. Test for power by
initiating any control function except the float. NOTE:
The POWER rocker switch must be in the "ON"
position to properly test any plow function. If the
solenoid is grounded and no power exists, diagnose
the plow & truck harnesses.
Connect red wire and check the black ground wire. If
problem is not resolved, the solenoid could be
inoperable or the pump motor may be worn. Replace
the solenoid if there is no power to the pump.
Replace the pump motor if it is receiving power.
Disconnect the brown/white activation wire from the
solenoid. If the problem is not resolved, replace the
solenoid.
Disconnect the control in the cab. If the pump turns
off, there is a short in the electrical system.
Add fluid to within 3/4"from the top of the tank. Check
for leaks around the pump, manifold and cylinders.
Adjust the pressure. Remove the hex cap on top of
the pump and turn the screw clockwise. Proper
system pressure should be set at 2400PSI. Test
functions and repeat procedure as needed.
Repair or replace vehicle alternator. System
amperage draw is 135A(145A for 760LT) at 1500PSI.
Remove the pump tank and thoroughly clean the
filter.
Lower the draw latch to relieve binding on the A-
frame latch and reposition the A-frame latch as
needed.
Connect the power connector from the control to the
vehicle harness.
Lift the A-frame latch into the raised position.
Clean diode loop harness thoroughly and/or replace.
Remove the S6 coil from the cartridge valve. Position
a screwdriver inside of the coil and push the draw
latch connect/disconnect toggle switch upward. The
screwdriver should be magnetically drawn to the coil.
Replace the coil if there is no action.
Loosen cartridge valve S6 to relieve pressure and
retighten. DO NOT OVER TIGHTEN! Valves should
be torqued to a maximum of 24 ft-lbs.
Remove any foreign objects that may be obstructing
proper valve operation. Replace if not operating
properly after cleaning.
April 1, 2006