1 Check the pilot valve
Faulty
Repair or replace the pilot
valve
Normal
2
Check the spool opera-
tion
Faulty
block
Normal
Check the slew relief
valve
Faulty
Repair or replace the slew re-
lief valve
Normal
4 The slew motor is faulty
Repair or replace the slew
motor
1. Check the pilot valve
It is likely that only the pilot valve spool on the side
2. Check the spool operation
It is likely that the spool does not move in the direction
-
eration”
3. Check the slew relief valve
4. The slew motor is faulty
“4. Disassembly and assembly, Slew motor”
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