4. SWING SYSTEM 4. SWING SYSTEM BOTH LH AND RH SWING ACTIONS ARE IMPOSSIBLE BOTH LH AND RH SWING ACTIONS ARE IMPOSSIBLE 1) 1) 5-9 NO YES Is safety solenoid YES valve pressure within standard? Is gear pump pilot NO pressure within YES standard level? Is oil in hydraulic YES tank within standard level? NO YES Are broken pieces of coupling present ⓐ when dust plug under engine fly Are attachment wheel is removed? Is not main relief NO NO valve faulty? and travel motions impossible at all? Does swing NO control valve YES spool move Is MCV pilot lightly by hand? YES pressure within YES standard level? Does dozer NO NO function? NO YES Is swing brake ⓑ release valve faulty?
YES Does swing NO motor rotate? NO YES NO Is gear pump delivering oil? NO Is gear pump pilot ⓒ pressure within standard level? YES Is not there oil leakage from YES pilot piping or is not it clogged? NO Cause Remedy Cause Remedy ⓐ Replenish specified oil to the standard level. Repair or replace. Repair or replace. Disassemble and repair. Disassemble and repair. Disassemble and repair. Disassemble and repair. Disassemble and repair. Disassemble and repair. Disassemble and repair. Disassemble and repair or replace. Disassemble and repair. Clean pilot piping interior or repair piping. Disassemble and repair. Safety valve faulty or not operated. Gear pump faulty.
Pump connection coupling is broken. Hydraulic pump is Is not main relief NO out of order. Swing control valve spool is ⓑ stuck. ⓒ Hydraulic pump is broken. Swing brake release valve is broken. Swing reduction unit is broken. Swing motor is broken. Pilot relief valve is faulty. Gear pump is out of order. Pilot valve is S broken.