Blizzard 680LT Assembly & Operation Manual page 37

Problem
Plow will not lift with magnification to the
S6 coil.
Plow will not stay angled when plowing.
Plow will not angle, pump works.
Plow lowers too slow.
Plow drops sporadically.
Headlights will not switch from the vehicle to
the snowplow.
Should your snowplow develop other problems not indicated in the Troubleshooting Guide, contact your local dealer for technical assistance and/or replacement parts.
Angle Pressure Relief Valve
Variable Flow Control Valve
Clockwise - Decreases Plow Drop Speed
Counterclockwise - Increases Plow Drop Speed
Probable Cause(s)
Hydraulic lock in the manifold. This occurs if the voltage is
too low on the coils – should be 11.8 volts.
Solenoid cartridge valve may be contaminated.
The angle pressure relief valve is set too low.
NOTE: Increasing the pressure relief valve will cause
damage to your plow. Do not set the pressure relief
greater than 3000 PSI (See illustration below)
Review all probable causes above.
Variable flow control valve is not adjusted properly.
(See illustration below)
Review all probable causes for plow will not lift (Page 34).
Variable flow control valve is opened too far.
No power or ground to the headlight relay.
Jam Nut
Suggested Remedy
Loosen cartridge valve S6 to relieve pressure and re-
tighten. DO NOT OVERTIGHTEN! 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.
Check the pressure relief by testing the valve inline with
the cylinder. Attach a tee fitting to the angle cylinder
hydraulic adapter and connect the hose and pressure
gauge to the tee. Push the plow against a solid object
and record the pressure reading. Note: The setting should
not exceed 3000 PSI.
NOTE: Verify coils S3 & S4 for angle functions.
Turn flow control valve counterclockwise in small incre-
ments and test. NOTE: Never make adjustments when
the plow is in the raised position! Fluid pressure will make
the valve difficult to adjust and serious injury or death can
occur from a falling plow.
Verify S5 coil (float) or S5 & S8 coils (disconnect) for
magnetism.
Turn clockwise 1/16 of a turn and test. See warning above.
Verify green/yellow (G/Y) wire for the ground is connected.
Verify black/white (BK/W) wire for the power is connected.
If both are connected properly, replace the headlight relay.
Valve
Variable Flow
Control Valve
Troubleshooting Guide (2 of 2) 35