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Lit. No. B64090, Rev. 00 35 April 1, 2006
TROUBLESHOOTING
Problem Cause Solution
Plow harness may not be properly
connected to the vehicle harness.
Verify the harnesses are properly connected.
Pump will not run.
Power or ground cables to the
battery, pump or solenoid may not
be 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.
Pump will not run, power to the
solenoid.
The black ground wire and
brown/white activation wire on the
solenoid are not properly
connected.
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.
Pump will not run with power to the
solenoid. Brown/white activation
wire and ground are properly
connected.
The red, hot wire to the pump
motor is not properly connected.
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.
Solenoid may be damaged.
Disconnect the brown/white activation wire from the
solenoid. If the problem is not resolved, replace the
solenoid.
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.
Short in the control or wire
harness.
Disconnect the control in the cab. If the pump turns
off, there is a short in the electrical system.
Fluid level in the pump reservoir is
low. Fluid is leaking.
A
dd fluid to within 3/4”from the top of the tank. Check
for leaks around the pump, manifold and cylinders.
System pressure may be set too
low. Increasing the pressure
excessively will increase the
amperage draw. This could
damage the vehicle harness.
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.
Amperage from the vehicle’s
alternator is too low.
Repair or replace vehicle alternator. System
amperage draw is 135A(145A for 760LT) at 1500PSI.
Pump runs but plow functions are
slow.
Pump filter may be clogged.
Remove the pump tank and thoroughly clean the
filter.
A-frame latch will not move.
Draw latch is binding the A-frame
latch.
Lower the draw latch to relieve binding on the A-
frame latch and reposition the A-frame latch as
needed.
Control station in the cab may not
be properly connected
Connect the power connector from the control to the
vehicle harness.
A-frame latch is in the (down)
locked position.
Lift the A-frame latch into the raised position.
Diode loop harness may be
corroded or could have failed.
Clean diode loop harness thoroughly and/or replace.
Plow will not lift. Pump works
properly.
Coils on the manifold may be
damaged.
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.
Hydraulic lock in the manifold. This
occurs if the voltage is too low on
the coils –should be 10 volts.
Loosen cartridge valve S6 to relieve pressure and
retighten. DO NOT OVER TIGHTEN! Valves should
be torqued to a maximum of 24 ft-lbs.
Plow will not lift with magnification
to the S6 coil.
Solenoid cartridge valve may be
contaminated.
Remove any foreign objects that may be obstructing
proper valve operation. Replace if not operating
properly after cleaning.