Disassembly And Assembly Of Travel Ppc Valve Assembly - Komatsu PC210-8 Shop Manual

UEN00663-02
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.
End coil diameter of the spring (inside
q
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):
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°.)
Thickness of washers=1.0, 1.3, 1.6
q
7. Tighten each part to the following torque.
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):
q
0.441 – 0.588 Nm {0.045 – 0.06 kgm}
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}
q
24
4 – 8cc/all-around
50 Disassembly and assembly
PC210, 230, 240-8