Komatsu PC88MR-10 Shop Manual page 1125

To disassemble and test the travel motor, perform the maintenance work according to the following standard.
The moving and sliding parts are precise parts. Be careful not to damage them.
1. Handling seals
If the seals (O-ring, oil seal, and floating seal) are disassembled once, be sure to replace all of them with
new ones regardless of damages.
2. Maintenance standard of wear parts
1) Replace all the visibly and significantly worn parts with new ones.
2) If the parts are abnormal as described below, replace all of them with new ones.
Part
Part name
number
1 Hub
Spindle
2
3
Carrier assembly
Others
No.1 sun gear
4
No.2 sun gear
6
No. 1 planetary
gear
5
No. 2 planetary
7
gear
No.2 thrust
washer
10
No.3 thrust
11
washer
12
No.1 thrust
washer
Ball bearing
24
27
Needle bearing
28
29
Bearing inner race
30
Rear flange
301
102 Shaft
Swash plate
103
Cylinder block
104
105
Piston assembly
(piston + shoe)
106
Retainer plate
107
108 Thrust ball
PC88MR-10
Phenomenon
Significant damage is found on the appearance.
Pitching occurs on the tooth surface of the ring
gear.
It is abnormally worn, such as scuffing.
Significant damage is found on the appearance.
It is abnormally worn, such as scuffing.
It is abnormally worn, such as scuffing.
Pitching occurs on the tooth surface.
Flaking phenomenon is found on the rail surface
of the bearing.
The sliding surface is discolored and worn.
Indentation is found.
Flaking phenomenon is found on the rail surface
of the ball bearing.
It is unevenly worn.
Pitching occurs on the needle bearing.
The bearing cage end surface is abnormally
worn.
Flaking phenomenon is found on the rail surface
of the bearing.
Scratches are found on sliding surfaces of spool
(323) and valve (363).
Mating face with oil seal (132) is worn.
The spline part is worn.
Seizure phenomenon is found.
The spline part is worn.
Inner bore significantly wears.
The sliding surface with timing plate (109) is
scratched or unevenly worn.
Clearance is found between piston (105) and
shoe (106) in direction of the shaft.
The shoe is worn abnormally and unevenly.
The sliding surface with shoe (106) is unevenly
worn.
The sliding surface with thrust ball (108) is
damaged and unevenly wears.
The spherical sliding surface with retainer plate
(107) is unevenly worn.
50 Disassembly and assembly
Power train system
Standard
value
-
-
-
-
-
-
-
-
-
-
-
Clearance
0.05 mm
-
-
Allowable
value
-
-
-
-
-
-
-
-
-
-
-
Clearance
0.15 mm
-
-
50-97