Takeuchi TB 250, Руководство по ремонту

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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 severe 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 severe roughness
• There are scratches that cause oil to leak • Replace
• Replace
Relief valve assembly • Abnormal drop in set pressure
• Unstable set pressure causes vibration
• Strong leakage due to faulty seating • Replace
• Replace
• Replace
Spring • Damaged or severely 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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