TROUBLESHOOTING
SWING MOTION ERRATIC (CONTINUED)
CAUSE REMEDY
Swing bearing not lubricated properly..................................................Lubricate swing bearing.
Main relief malfunctioning....................................................................See section on “Relief Valves”.
BOOM DRIFTS DOWN
CAUSE REMEDY
Hold valve not seating properly ............................................................Replace hold valve.
Hoist cylinder by-passing......................................................................See section on “Cylinder Leakage”.
BOOM HOIST ONLY - INOPERATIVE OR ERRATIC
CAUSE REMEDY
Boom will drift down............................................................................Repair or replace hold valve.
Boom won’t lower.................................................................................Repair, replace, or backflush hold valve.
Boom hoist cylinder binding.................................................................Repair or replace.
Load is too great....................................................................................Consult capacity chart, check RCI.
Piston packings damaged ......................................................................Replace packings.
Low oil level..........................................................................................Add oil as required.
Hose plugged or liner collapsed............................................................Replace hose.
Air in cylinder .......................................................................................Bleed cylinder.
BOOM DROPS SLIGHTLY AS RAISE CONTROL IS RELEASED
CAUSE REMEDY
Air in cylinder .......................................................................................Bleed cylinder.
Boom hoist hold valve free flow check
not seating properly...............................................................................Replace hold valve.
BOOM HOIST CIRCUIT
RT700 Series Page 5 - 15 Issued: August 2003
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