Hyundai Robex 22-7, Service Manual

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19-3 Slewing system
19-3-1 No operation both (right/left) slewing.
19-6
Not turning
It can be turned
It has resistance
No
resistance
Not relieving
Faulty
Is turning motor
relieving or not?
Test turning when
push bucket by hand.
Take the turning
motor off.
Check the pinion gear
on turning motor and
(also) bearing gear.
Check turning when
push bucket by hand.
Faulty turning motor.
OK
It is relieving
Gear is damaged
Seized turning bearing, etc.
Replace pinion gear
or turning bearing.
Replace turning
bearing.
Disassemble, repair
or replace turning
motor Ass'y.
Faulty pump.
Faulty control valve.
Spool is sticking.
Faulty turning relief valve.
Replace seals or
pump Ass'y.
Replace valve or Ass'y.
Replace seals or
valve block.
Disassemble, clean
or replace.
OK
Check the function of
slewing operation
system (dozer, swing).
Change over relief
valves to the other
pump port, then test.
Faulty relief valve.
Disassemble, clean
or replace.
Change over outlet
hoses to pump No.1's
or No.2's, then test.
Adjust to correct
pressure or replace.
Faulty
OK
OK
Relief valve is sticking
Low pressure
Faulty