Disassembly And Assembly Of Idler Cushion - Komatsu PC200-8M0 Shop Manual

400 Undercarriage and frame

Disassembly and assembly of idler cushion

Disassembly and assembly of
idler cushion
Special tools
Part number
791-600-2001 Compressor (A)
or
791-685-8006 Compressor (B)
790-201-2780 Spacer
1
791-635-3160 Extension
Cylinder
790-101-1600
(686 kN {70 ton})
790-101-1102 Pump
790-640-2180 Guide bolt
M
790-101-5201 Push tool kit (B)
790-101-5241 • Plate
2
790-101-5221 • Grip
01010-51225 • Bolt
790-201-1500 Push tool kit
790-201-1620 • Plate
3
790-101-5021 • Grip
01010-50816 • Bolt
k
Since the load at installed length of the
spring is large and dangerous, set the
spring securely to the tool.
a Figure of structure
PC200, 200LC, 220, 220LC-8M0
1
Part name
t 1
t 1
t 1
t 1
t 1
t 1
t 1
q 1
1
1
2
q 1
1
1
1
Disassembly
1. Remove piston assembly (2) from idler cushion
assembly (1).
2. Disassembly of idler cushion assembly
1) Set idler cushion assembly (1) to tool M1.
a Load at installed length of spring:
PC200-8M0: 109.3 kN {11,150 kg}
PC200LC-8M0, PC220-8M0,
PC220LC-8M0: 126.5 kN {12,900 kg}
2) Apply hydraulic pressure gradually to
compress the spring and remove lock
plate (3) and nut (4).
a Compress the spring until the nut
becomes loose.
a Release the hydraulic pressure slowly
to release the compression of the
spring.
a Free length of spring:
PC200-8M0: 503 mm
PC200LC-8M0, PC220-8M0,
PC220LC-8M0: 561 mm
3) Remove yoke (6) and cylinder (7) from
spring (5).
4) Remove snap ring (8), dust seal (9) and
bushing (10), in turn from cylinder (7).
3. Further disassembly of piston assembly (2)
1) Remove lock plate (12) from piston (11),
and then remove valve (13).
2) Remove snap ring (14), then remove U-
packing (15) and ring (16).
SEN06145-00
11
50-400