Komatsu PC200-8M0, Shop Manual

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SEN06146-00
50-500
30
PC200, 200LC, 220, 220LC-8M0
500 Hydraulic system
Disassembly and assembly of work equipment cylinder
Disassembly of cylinder head
1. Remove the O-ring and backup ring (15).
2. Remove snap ring (16), then remove dust seal
(17).
3. Remove rod packing (18) and buffer ring (19).
4. Remove snap ring (30).
5. Remove bushing (20).
Disassembly of cylinder (arm cylinder only)
1. Remove plug (21).
2. Remove spring (22) and valve (23).
Assembly
a
Be careful not to damage the packings, dust
seals, O-rings, etc.
a
Clean each part. After assembling the cylinder,
cover the piping ports and pin holes to prevent
entering of dirt.
a
Before installing the backup ring, warm it in hot
water of approximately 50 to 60°C. Do not
attempt to force it into position.
Assembly of cylinder (only for arm cylinder)
1. Install valve (23) and spring (22).
2. Install plug (21) with O-ring (24).
a
Clean, degrease, and dry the thread por-
tion of the plug, and then apply liquid gas-
ket to the entire periphery of the thread
portion.
3 Plug (21):
83.4 – 102.9 Nm {8.5 – 10.5 kgm}
2 Plug (21): Liquid gasket (LG-5)