Komatsu PC210-8, Shop Manual

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UEN00663-02 50 Disassembly and assembly
24
PC210, 230, 240-8
Disassembly and assembly of
travel PPC valve assembly
a
This chapter deals only with precautions to be
followed when assembling the travel PPC valve
assembly.
Assembly
a
When assembling, clean and inspect the parts
closely and take care fully so that dirt, rush,
flaw, etc. never cause a trouble.
1. When assembling piston (1), apply grease
(G2-LI) to its outside and inside of the body
hole.
2. Install spring (2) with its small diameter side of
the end coil diameter on the shim (3) side.
q
End coil diameter of the spring (inside
diameter)
Small diameter end: ø4.9 large diameter
end: ø5.55
3. Do not drive in bushing (4) by hitting it directly
with a hammer.
4. Do not drive in pin (5) by hitting it directly with a
hammer.
5. Apply grease (G2-LI) to the swaying part of
shaft (6), the contact surfaces of lever (7) and
piston (1), contact surfaces of damper (9) lever
and pin (8).
2
Applying quantity of grease (G2-LI)
Swing part of shaft (6):
4 – 8cc/all-around
Contact surface of lever (7) and piston
(1):
0.3 – 0.8cc/1 place
Contact surface of damper (9) lever and
pin (8):
0.3 – 0.8cc/1 place
6. Install washer (10) 1.6 mm thick first. If the dif-
ference between both sides at the stroke and
of the lever exceeds 0.7°, change the washer
thickness to reduce the difference to below
0.7°. (If the washer thickness is reduced by 0.3
mm, the stroke end angle is increased by
0.39°.)
q
Thickness of washers=1.0, 1.3, 1.6
7. Tighten each part to the following torque.
q
Plug (11): 34 – 44 Nm {3.5 – 4.5 kgm}
q
Plug (12): 9.8 – 14.7 Nm {1 – 1.5 kgm}
q
Plug (13): 24.5 – 34.3 Nm {2.5 – 3.5 kgm}
q
Bolt (14): 19.6 – 27.4 Nm {2.0 – 2.8 kgm}
q
Screw (15):
0.441 – 0.588 Nm {0.045 – 0.06 kgm}
q
Bolt (16): 25 – 31 Nm {2.5 – 3.2 kgm}
q
Bolt (17): 27 – 34 Nm {2.8 – 3.5 kgm}
q
Plug (18): 6 – 11 Nm {0.6 – 1.1 kgm}
q
Plug (19): 4 – 9 Nm {0.4 – 0.9 kgm}