Troubleshooting Guide
29
PROBLEM
DIAGNOSTIC CHECK
RESULT
Check pressure at
pressure port of pump.
If pressure is less than
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 WING OUT
solenoid valve.
WING OUT solenoid valve
not opening completely.
Replace.
Check wiring and control
box.
9. Wing(s) extend, but will
not retract or retract
slowly.
Check power/ground
cables and control cables
are connected properly.
Connect.
Check wiring on valve
block for proper
connections.
Refer to the wiring diagram
in this manual.
Check for voltage between
solenoid valve terminal
and ground with ignition
switch on and control
switch in WING IN
position.
If voltage is present,
solenoid valve or valve coil
has failed. Replace valve.
If NO voltage is present,
check wiring and switch box
control.
10. Wing(s) retract too
easily while plowing.
Pressure relief valve
pressure set too low.
See an Authorized BOSS
Dealer for pressure relief
valve adjustment.
11. Oil leaks from cylinders.
Loose packing.
Tighten packing 1/8-turn
increments until leak stops.
Check rod condition.
If rods are pitted or rough,
polish with copus cloth or
extra fine steel wool.
12. Battery goes dead with
all switches in neutral.
Possible short in switches. Inspect wiring of control box
switches, replace
switch(es).
Possible short in wiring
harness.
Repair damaged wire.
Possible short in valve
coils.
Replace coils.
13. Plow lights are dim, will
not come on or flicker.
Check electrical
connections.
Clean and repair any
corroded or damaged
terminals.
Check headlight adapter
wires.
Verify proper headlight
adapters are being used
and are correctly installed.
Check relays for corrosion
and function.
Relays should click when
energized.
14. Turn signals flash at a
rapid rate.
Check flasher.
Replace original vehicle
flasher with heavy-duty six-
lamp flasher provided.
