DISASSEMBLY AND ASSEMBLY
SLEW MOTOR
13
4
SLEW MOTOR 4N0AX00
Inspection and adjustments
Checking the parts
Brake valve
Hydraulic motor
Part Criteria Action
Body • If there is severe damage to sliding parts or excessive surface rough-
ness
• Replace
• If there is damage, etc. that allows oil leakages to occur • Replace
Relief valve as-
sembly
• If there are abnormal drops in the set pressure • Replace
• If there is vibration due to the set pressure being unstable • Replace
• If there is increased leakage due to faulty seating • Replace
Spring • If there is a high degree of breakage or deformation • Replace
Steel ball • If there is damage, etc. that allows oil leakages to occur • Replace
Part Criteria Action
Shaft • If there is pitting, abrasion, etc. occurring on the surfaces of the gear
teeth
• Replace
• If there is flaking or pitting occurring on rolling surfaces • Replace
Ball bearing • If there are abnormalities occurring in rotation (abnormal noise gen-
erated, rotation not smooth, etc.)
• Replace
• If there is flaking, abrasion, etc. occurring on rolling surfaces • Replace
Valve drive • If there is pitting, abrasion, etc. occurring on the surfaces of the gear
teeth
• Replace
Drive gear • If there is excessive wear on the spline • Replace
Inner face seal • If there is damage, etc. that allows oil leakages to occur • Replace
Outer face seal
Steel ball • If there is damage, etc. that allows oil leakages to occur • Replace
Gerolor • If there is pitting, abrasion, etc. occurring on the surface of the gear
teeth
• Replace
• If there are abnormalities occurring in rotation (abnormal noise gen-
erated, rotation not smooth, etc.)
• Replace
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