Disassembly And Assembly Of Travel Ppc Valve Assembly - Komatsu Galeo PC800-8 Shop Manual

50 Disassembly and assembly
Disassembly and assembly of
travel PPC valve assembly
a In this section, only precautions for assembling
the travel PPC valve assembly are explained.
Assembly
a Clean and check the parts so that dirt, rust,
flaws, etc. will not cause a trouble and then
assemble them with extreme care.
1. When assembling piston (1), apply grease
(G2-LI) to the outside of the piston and inside
of the body hole.
2. Install spring (2) with its small diameter end on
the shim (3) side.
Diameter of (Inside diameter) of spring
q
Small diameter end: ø4.9
Large diameter end: ø5.54
3. Do not insert bushing (4) by hitting it with a
hammer directly.
4. Do not insert pin (5) by hitting it with a hammer
directly.
5. Apply grease (G2-LI) to the rocking parts of
shaft (6), contacting parts of lever (7) and pis-
ton (1), and contacting parts of the lever of
damper (9) and pin (8).
2
Quantity of grease (G2-LI) to be applied
Rocking parts of shaft (6):
Contacting parts of lever (7) and piston (1):
Contacting parts of lever of damper (9)
and pin (8): 0.3 – 0.8 cc/part
6. Install washer (10) 1.6 mm thick first. If the dif-
ference of the lever stroke angle between the
right and left exceeds 0.7°, replace the washer
with one of different thickness to reduce the
difference below 0.7°. (If the washer thickness
is reduced by 0.3 mm, the stroke angle is
increased by 0.39°.)
a Install one of washers (10).
Thicknesses of washers:
q
PC800, 850-8
4 – 8 cc/periphery
0.3 – 0.8 cc/part
1.0, 1.3, 1.6, 1.9, 2.2 mm
7. Tighten each part to the following torque.
Plug (11): 34 – 44 Nm {3.5 – 4.5 kgm}
1
q
Plug (12): 9.8 – 14.7 Nm {1 – 1.5 kgm}
q
Screw (15): 0.441 – 0.588 Nm {0.045 – 0.06
q
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
SEN01057-01
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