Hiniker DB-7929-1, Руководство по обслуживанию

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10 Plow Will Not Lower
PLOW WILL NOT LOWER
ALL OTHER FUNCTIONS ARE NORMAL.
PERFORM STEPS 1 THRU 5 OF THE
“NORMALLY CLOSED RELEASE VALVE TEST.”
SEE PAGE 27.
DO NOT REPLACE CARTRIDGE VALVE AT THIS TIME.
DOES PLOW LOWER?
Support plow blade with a floor jack or
other suitable means. Relieve hydrau-
lic pressure by loosening hose fitting on
lift cylinder. Remove, inspect and clean
NC Release Valve. See page 15.
Ensure plunger pushes in approximate-
ly 1/16” and springs back. If it does not,
replace cartridge valve. Reinstall.
Does plow lower?
Support plow blade same as above.
Check for plugged fittings, hydraulic hose
and external flow control valve. Remove
and drain oil from lift cylinder. Check for
frozen/binding cylinder by manually com-
pressing and extending the cylinders.
Repair or replace as necessary.
Does plow lower?
Yes No
Yes No
End
Yes No
End
End
PLOW WILL NOT LOWER
Perform all initial inspections and checks listed on page 2 before beginning test procedure.
WARNING: Never disconnect any hydraulic line or fitting with the unit in the raised posi
-
tion. Always lower the unit and relieve pressure before removing any lines or caps. Allow
the system to cool down before draining oil or handling system components. Serious
burns can result from contact with hot oil.
Call Hiniker Service