4-176
4
SLEW MOTOR
DISASSEMBLY AND ASSEMBLY
Inspection and adjustment
Use limit for parts
Brake valve
Part Judgment criteria Treatment
Check valve, piston • Deep scratches on sliding surfaces or sever
e roughness
• Clearance with the body is too large
•
Deep scratches on the valve seat or unevenly seated
• Replace
• Replace
• Replace
Body • Deep scratches on sliding surfaces or sever
e roughness
• Ther
e are scratches that cause oil to leak
• Replace
• Replace
Relief valve assembly • Abnormal dr
op in set pressure
• Unstable set pr
essure causes vibration
• Strong leakage due to faulty seating
• Replace
• Replace
• Replace
Spring • Damaged or sever
ely deformed • Replace
Hydraulic motor
Part
Standard dimension
Recommended
replacement value
Treatment
Clearance between
piston and cylinder
bore
0.02 mm 0.04 mm Replace
cylinder block
and swash plate as-
sembly
Play
(S) of piston and
shoe
0.15 mm 0.4 mm Replace
cylinder block
and swash plate as-
sembly
Bearing Flaking
or pitting
on the rolling sur-
face
Replace
Cylinder block sliding
surface (1)
Sliding
surface is
rough
Repair by lapping
(#1000 powder) or re-
place.
Port
block sliding sur-
face (2)
Replace
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