Swng Circuit
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
AC is "ON" and swing sensor is "OFF" Check swing sensor activates to shutoff hyd
flow to compressor.
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 bearing not lubricated properly Lubricate swing bearing
Main relief malfunctioning See section on “Relief Valves”
405P/N 12261-683 REVISED: January 2015
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