Lit. No. 69829, Rev. 01 10 December 15, 2016
69400, 69450, 69450-1, 69450-2
8. Turn the vehicle ignition to the "ON" or
"Accessory" position. Turn the control ON.
9. While pressing the RAISE button on the snowplow
control, note the hydraulic gauge pressure reading
as the blade is rising. (The pressure can only be
read as the blade is rising. It may be necessary to
perform this process more than once to obtain an
accurate reading.) The recommended pressure is
350 psi.
10. If the hydraulic pressure reading is less than
350 psi, increase the pressure by turning the
scrape lock valve stem clockwise 1/4 turn and
retest the pressure.
NOTE: Adjustments should be made in 1/4-turn
increments.
11. Repeat Steps 9 and 10 until the recommended
pressure (350 psi) is obtained.
NOTE: Adjusting the scrape lock pressure
in excess of the recommended pressure will
increase amp draw and will shorten the life of
the plow motor.
12. Once the recommended pressure is obtained,
lower the blade completely and turn the control
OFF. Turn the vehicle ignition to the "OFF"
position.
13. Disconnect the snowplow battery cable from the
vehicle battery cable.
SCRAPE LOCK ADJUSTMENT
1. Park the vehicle on a smooth, level, hard surface,
such as concrete. Lower the blade to the ground
and turn the control OFF. Leave the snowplow
attached to the vehicle. Turn the vehicle ignition to
the "OFF" position.
2. Disconnect the snowplow battery cable from the
vehicle battery cable.
3. Remove the hydraulic unit cover.
4. Loosen the breather/fi ll plug slowly to relieve any
pressure in the reservoir.
5. Using a "Tee" fi tting, install a 500–600 psi gauge
in the lift ram base hose.
6. Retighten the breather/fi ll plug.
7. Reconnect the snowplow battery cable to the
vehicle battery cable.
Hose
Pressure
Gauge
To Lift Ram Base
Scrape Lock
Adjustment
= Increase Pressure
= Decrease Pressure
CAUTION
Never operate the unit while adjusting the
scrape lock valve. Doing so will damage the
scrape lock valve O-rings.
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