IV-133
HYDRAULIC UNITSTRAVEL MOTOR
INSPECTION AND ADJUSTMENT
Use Limit for Parts
Part Location Criteria Action
Planet gear Gear tooth surface No abnormal scratches, wear or flak-
ing on the tooth surface
Replace
Rolling surface of the
needle bearing
No abnormal scratches, wear or flak-
ing on the rolling surface
Replace
Needle bearing Needle bearing surface No abnormal scratches, wear or flak-
ing on the surface
Replace
Housing, sun
gear, drive gear
Gear tooth surface No abnormal scratches, wear or flak-
ing on the tooth surface
Replace
Thrust plate Sliding surface No abnormal scratches, wear or flak-
ing on the surface
Replace
O-ring — — Replace
Shaft Oil seal surface No scratches or wear Replace
Ball bearing Sliding surface No abnormal scratches, wear or flak-
ing on the ball or race
Replace
Oil seal — — Replace
Swash plate Surface of the sliding part
with the piston assembly
No abnormal scratches, wear or sei-
zure on the surface
Repair with a lap-
ping tool (#1000) or
replace
Cylinder block Surface of the sliding part
with the valve plate
No abnormal scratches, wear or sei-
zure on the surface
Repair with a lapping
tool (#1000) or replace
the cylinder block and
the piston together
Piston assembly Surface of the sliding part
with the swash plate
No abnormal scratches, wear or sei-
zure on the surface
Valve plate Surface of the sliding part
with the plunger
No abnormal scratches, wear or sei-
zure on the surface
Repair with a lap-
ping tool (#1000) or
replace
Valve body Surface of the sliding part
with the plunger
No abnormal scratches, wear or sei-
zure on the surface
Replace the valve
body and the spool
together
Spool Surface of the sliding part
with the base plate
No abnormal scratches, wear or sei-
zure on the surface
Center disc,
friction disc
Disc thickness Four center discs and three friction
discs are worn to 13.5 mm or less
Replace
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