Boss Snowplow STB08980, Installation Instructions Manual, Page: 23 / 36

Problem Possible Cause Corrective Action
1. Check the hydraulic-fluid level. 1. The hydraulic-fluid level should be
within 2 cm (3/4 inch) of the top of the
reservoir when lowered.
2. Check that the power/ground cables
and the control cable are connected
properly.
2. Connect the cables if they are not
connected.
3. Check the wiring on the valve block for
proper connections.
3. Refer to the manifold wiring diagram
included with your Owner’s Manual .
4. Load a test battery. 4. Replace the battery if it is weak or
defective.
5. Check the pressure at the pressure
port of the pump.
5. If the pressure is less than 2,500 psi (at
the end of the lift), the motor brushes
may be defective, the pump pressure
relief valve may be contaminated,
damaged, or set to less than 2,500 psi,
or the pump may be worn.
6. Check the R
AISE
control solenoid
valve.
6. If the R
AISE
solenoid valve is not
opening completely, replace it.
The plow does not raise or raises slowly.
7. Check the L
OWER
control solenoid
valve.
7. The L
OWER
solenoid valve may be
stuck open. Replace it.
1. Check the A
NGLE
control solenoid
valve.
1. If the A
NGLE
control solenoid valve is
contaminated, clean or replace it.
2. Check that the pressure relief valve is
not contaminated.
2. If the pressure relief valve is
contaminated, clean or replace it.
The plow angles while plowing.
3. Check that the pressure relief valve is
set correctly.
3. If the pressure is set too low, contact
your authorized BOSS dealer.
1. Check the hydraulic-fluid level. 1. The hydraulic-fluid level should be
within 2 cm (3/4 inch) of the top of the
reservoir when lowered.
2. Check that the power/ground cables
and the control cable are connected
properly.
2. Connect the cables if they are not
connected.
3. Check the wiring on the valve block for
proper connections.
3. Refer to the manifold wiring diagram
included with your Owner’s Manual .
4. Load a test battery. 4. Replace the battery if it is weak or
defective.
The plow does not angle or angles slowly.
5. Check the A
NGLE
control solenoid
valve.
5. If the A
NGLE
solenoid valve is not
opening completely, replace it.
1. Inspect the fittings and O-rings. 1. Tighten loose fittings. See your
authorized BOSS dealer for a seal kit.
Oil leaks from the lift cylinders.
2. Check the rod condition. 2. If the rods are pitted or rough, polish
them with a copus cloth or extra fine
steel wool.
The vehicle battery dies when the vehicle
is turned off. 1. Verify that the plow was installed to a
keyed fuse source.
1. Refer to the wiring diagram included
with your Owner’s Manual .
1. Inspect the controller wiring for a short. 1. If there is a short, repair or replace the
controller.
2. Inspect the wire harness for a short. 2. If there is a short, repair or replace the
wire harness.
The vehicle battery dies when all the
switches are in the N
EUTRAL
position.
3. Inspect the valve coils for a short. 3. If there is a short, replace the valve
coils.
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