TROUBLESHOOTING
SWING COMPLETELY INOPERATIVE
CAUSE REMEDY
Mechanical swing lock applied, if equipped.........................................Disengage the swing lock.
Swing brake applied ..............................................................................Disengage the swing brake.
Spring brake stuck in applied position..................................................Disassemble swing brake and free-up unit.
Swing valve main relief valve stuck in open position...........................See section on “Relief Valves”.
Swing motor leaks excessively internally.............................................See section of “Fluid Motor”.
Mechanical fault in swing reducer
gear box or swing bearing.....................................................................Repair swing reducer or replace swing bearing.
Hose plugged or liner collapsed............................................................Replace hose.
Rotary manifold leaking internally .......................................................Reseal rotary manifold.
Swing pump faulty ................................................................................See section on “Pumps”.
SWING MOTION SLUGGISH
CAUSE REMEDY
Main relief valve stuck in open position...............................................Replace.
Faulty swing pump................................................................................Repair or replace swing pump.
Swing motor leaks excessively, internally ............................................Replace or reseal motor.
Excessive leakage around swing control valve spool ...........................Replace or replace control valve.
SWING MOTION ERRATIC
CAUSE REMEDY
Brake not releasing completely .............................................................Check operation of swing brake and/or swing lock.
Low hydraulic oil level .........................................................................Add oil as required.
SWING CIRCUITSWING CIRCUIT
RT700 Series Page 5 - 14 Issued: August 2003
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