Straight Blade Plows

Straight Blade Plows
Troubleshooting Guide
Glossary of Problems:
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
Pump motor does not run.
Pump continues to run with switch in neutral.
Plow will not lower.
Plow will not raise or raises slowly, motor runs.
Blade Angles While Plowing Snow
Plow lowers too fast.
Blade will not angle, but motor runs.
Blade angles too easily while plowing.
Oil leaks from cylinders.
Battery goes dead with all switches in neutral.
Plow lights are dim, will not come on or flicker.
Turn signals flash at a rapid rate.
High beam indicator light not functioning properly.
Blade digs into the ground in the V position.
Oil runs out of fill cap of hydraulic pump.
Pump chatters when raising the plow or angling blade.
PROBLEM
1. Pump motor does not
run.
DIAGNOSTIC CHECK
Check power/ground
cables and control cables
are connected properly.
Check for voltage at pump
motor while ignition switch
is on and LIFT control
button is pushed.
RESULT
Connect.
If voltage is present, pump
motor has failed or pump
has seized. Motor brushes
may be replaced, otherwise
replace pump/motor
assembly.
Check for power to the
If voltage is not present
solenoid by testing for
between one large terminal
voltage between both
and ground, the cable
large terminals and
between the battery and
ground.
solenoid is disconnected or
broken.
Check for voltage between If NO voltage is present,
the other large terminal of solenoid has failed and
the solenoid and ground
must be replaced. If
while jumping power to the voltage is present, wire
small terminals with the
from small terminal of
white wire.
solenoid to ground may be
disconnected or broken.
Troubleshooting Guide
PROBLEM
DIAGNOSTIC CHECK
Test power to the control
box by checking voltage
between black wire and
ground at the white 9-pin
connector.
2. Pump continues to run
with switch in neutral.
Disconnect control box,
ignition ON.
3. Plow will not lower.
Check power/ground
cables and control cables
are connected properly.
Check flow control valve.
Check wiring on valve
block for proper
connections.
Check for voltage between
solenoid valve terminal
and ground with ignition
switch on and control
switch in FLOAT position.
Test power to the control
box by checking voltage
between black wire and
ground at the white 9-pin
connector.
RESULT
If NO voltage is present,
power from fuse box has
become disconnected. If
voltage is present check
wiring and control box
switch.
If pump continues to run,
solenoid has failed in the
closed position. Quickly
remove power to the pump
by disconnecting the
power/ground cables to the
plow. Replace solenoid.
If pump stops running,
check wiring of switch box
for short between black and
white/black wire in control
box, or failed switch.
Connect.
If flow control valve is
completely closed, place
RAISE/LOWER switch on
control box in NEUTRAL,
then open the flow control
valve.
Refer to the wiring diagram
in Hydraulics Manual.
If voltage is present
solenoid valve or valve coil
has failed. Replace valve.
If NO voltage is present,
power from fuse box has
become disconnected. If
voltage is present, check
wiring and switch of control
box.
Troubleshooting Guide
PROBLEM
4. Plow will not raise or
raises slowly (pump motor
runs).
5. Blade angles while
plowing snow.
6. Plow lowers too fast.
7. Blade will not angle or
angles slowly, motor runs.
DIAGNOSTIC CHECK
RESULT
Check hydraulic fluid level. Hydraulic fluid level should
be within ¾” from top of
reservoir or visible in street
elbow when lowered and in
the Straight Blade position.
Check power/ground
Connect.
cables and control cable
are connected properly.
Check wiring on valve
Refer to the wiring diagram
block for proper
in Owner’s manual.
connections.
Load test battery.
Replace battery if weak or
defective.
Check pressure at
If pressure is less than
pressure port of pump.
2500 psi (at end of lift).
Motor brushes may be
defective, pump pressure
relief valve may be
contaminated, damaged, or
set less than 2500 psi,
pump may be worn.
Check LIFT Solenoid
Lift solenoid valve not
Valve
opening completely.
Replace.
Check wiring and switch
box control
Check angle solenoid
If solenoid valve is
valve on manifold
contaminated, clean or
Check pressure
replace.
If pressure relief valve is
contaminated, clean or
replace.
Check flow control valve.
Close flow control valve to
desired drop speed.
Check hydraulic fluid level. Hydraulic fluid level should
be within ¾” from top of
reservoir or visible in street
elbow when lowered and in
the Straight Blade position.
Check power/ground
Connect.
cables and control cable
are connected properly.
Troubleshooting Guide
PROBLEM
DIAGNOSTIC CHECK
Check wiring on valve
block for proper
connections.
Load test battery.
Check Angle solenoid
valve.
8. Blade angles too easily
while plowing.
Pressure relief valve
pressure set too low.
9. Oil leaks from cylinders.
Loose packing.
Check rod condition.
10. Battery goes dead with
all switches in neutral.
11. Plow lights are dim, will
not come on or flicker.
Possible short in switches.
Possible short in wiring
harness.
Possible short in valve
coils.
Check electrical
connections.
Check headlight adapter
wires.
Check for good ground of
plow lights.
12. Turn signals flash at a
rapid rate.
Check flasher.
13. High beam indicator
does not function properly.
Check headlight adapters.
RESULT
Refer to the wiring diagram
in Owner’s Manual.
Replace battery if weak or
defective.
Angle solenoid valve not
opening completely.
Replace.
Check wiring and control
box.
See an Authorized BOSS
Dealer for pressure relief
valve adjustment.
Tighten packing 1/8-turn
increments until leak stops.
If rods are pitted or rough,
polish with copus cloth or
extra fine steel wool.
Inspect wiring of control box
switches, replace
switch(es).
Repair damaged wire.
Replace coils.
Clean and repair any
corroded or damaged
terminals.
Verify proper headlight
adapters are being used
and are correctly installed.
Sand paint under headlight
mount to bare metal,
securely tighten headlightmounting bolts.
Replace original vehicle
flasher with heavy-duty sixlamp flasher provided.
Verify proper headlight
adapters are being used
and are correctly installed.
Troubleshooting Guide
PROBLEM
14. Plow does not clean-up
snow from low areas.
15. Oil running out of fill cap
of hydraulic pump.
16. Pump chatters when
raising plow or angling
blade.
DIAGNOSTIC CHECK
Check electrical
connections to plow
lights/truck lights toggle
switch.
UP/DOWN switch not in
neutral.
Plowing on steeply
inclined terrain.
Pump reservoir over filled.
Hitting snow banks too
hard.
Hydraulic fluid low.
RESULT
Refer to the wiring diagram
in Owner’s Manual.
Place switch in DOWN
(FLOAT) position.
Avoid too steeply sloped
areas.
Reservoir should be filled to
¾” from top or until visible
in street elbow.
Do not plow recklessly.
Add hydraulic fluid.
Reservoir should be filled to
¾” from top or until visible
in street elbow.
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