Komatsu PC130-8, Руководство по ремонту

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50 Disassembly and assembly SEN04128-01
PC130-8
25
Maintenance standard
When disassembling and testing the travel motor, service it according to the following standard. Take care
not to scratch the moving parts and sliding parts since they are precision parts.
1. Handling of seals
Once you remove the seals (O-ring, oil seal, and floating seal), replace them with new ones, regardless
of the damage on them.
2. Maintenance standard for worn parts
1) Replace all the parts having extreme visible damage with new ones.
2) Replace all the parts having the following problems (phenomena) with new ones.
Part No. Part name Phenomenon Standard value
Permissible
deviation
1 Hub
• There is serious damage on outside.
• Tooth surface of ring gear is pitted.
• There is abnormal wear such as galling.
— —
2 Spindle
• There is serious damage on outside.
• There is abnormal wear such as galling.
— —
3, 7 Others Carrier assembly • There is abnormal wear such as galling. — —
4
8
5
9 Sun gear A
Sun gear B
Planetary gear A
Planetary gear B
• Tooth surface is pitted.
• Rolling surface of bearing is flaked.
— —
24 Ball bearing
• There is impression.
• Rolling surface of ball bearing is flaked.
• Worn unevenly.
— —
301 Rear flange
• There are scratches on sliding surface of
spools (323) and (363) and piston (381).
— —
102 Shaft
• Contact surface against oil seal (132) is worn.
• Spline portion is worn.
— —
103 Swash plate
• Parts are seized.
— —
104 Cylinder block
• Spline portion is worn.
• Inside wall of cylinder is worn excessively.
• Sliding surface against timing plate (109) is
scratched and worn unevenly.
— —
105
106 Piston assembly
( Shoe)
• There is clearance between piston (105) and
shoe (106) in axial direction.
• Shoe (106) is worn abnormally and unevenly.
Clearance:
0.05 mm
Clearance:
0.15 mm
107 Retainer plate
• Sliding surface against shoe (106) is worn
unevenly.
• Sliding surface against thrust ball (108) is
scratched and worn unevenly.
— —
108 Thrust ball
• Spherical sliding surface against retainer
plate (107) is worn unevenly.
— —
109 Timing plate
• Sliding surface is seized and worn unevenly.
— —
115
116 Disc
Plate
• Both end faces are worn unevenly.
• Specified torque is not obtained.
• Parts are seized.
Braking torque:
Min.
206 Nm {21.0 kgm}
Braking torque:
Min.
206 Nm {21.0 kgm}
105 Piston
• There is scratch on outside surfaces.
— —