Komatsu PC200-8M0 Shop Manual page 1101

500 Hydraulic system
Disassembly and assembly of travel PPC valve
Assembly
a Only precautions for assembly are described.
a Before assembly, thoroughly clean the parts
and check them for dirt, rust, or damage to pre-
vent failure. Assemble the parts with utmost
care.
a When installing piston (7), apply grease (G2-
LI) to its periphery and the inside of the valve
body hole.
a Install spring (4) with its small diameter end
facing shim (3).
Diameter of spring (inside diameter)
q
Small diameter end: f 4.9 mm
Large diameter end: f 5.55 mm
a Apply grease (G2-LI) to the rocking parts of
shaft (15), contact surfaces on lever (13) and
piston (7), and contact surfaces on damper
(18) and pin.
2
Grease (G2-LI)
Rocking parts of shaft (15): 4 to 8 cc/entire
periphery
Contact surfaces on lever (13) and piston
(7): 0.3 to 0.8 cc/part
Contact surfaces on damper (18) and pin:
0.3 to 0.8 cc/part
a For washer (12), install the one 1.6 mm in
thickness (t) first. If the difference in the lever
angle between right and left when the lever is
at full stroke position exceeds 0.7 degree,
change the thickness of the washer to make
the difference 0.7 degree or smaller.
a If the thickness of the washer is reduced by 0.3
mm, the full stroke angle of the lever increases
by 0.39 deg.
q Settings of thickness (t) of washer (12):
1.0, 1.3, 1.6, 1.9, 2.2 mm
a Tighten each part to the following torque.
3
Bolt (11): 27 to 34 Nm {2.8 to 3.5 kgm}
3
Bolt (17): 25 to 31 Nm {2.5 to 3.2 kgm}
3
Screw (19):
0.441 to 0.588 Nm {0.045 to 0.06 kgm}
PC200, 200LC, 220, 220LC-8M0
SEN06146-00
27
50-500