Workshop Manual

UPPERSTRUCTURE / Pilot Valve
W2-7-25
7. Install retaining rings (8) (4 used) to ring holder
(ST 4144). Install retaining rings (8) (4 used) to
the groove on the head of spool (21) out of
special tool (ST 4146).
IMPORTANT: Check the mounting positions of
pushers (9, 10) (2 used for each).
8. Install pushers (9, 10) (2 used for each).
After pushing pushers (9, 10) (2 used for each) by
hand, remove them. Check if retaining ring (8)
falls off or balance springs (3, 4) (2 used for each)
are located correctly.
After checking, install pushers (9, 10) (2 used for
each) to casing (18).
9. Apply grease to the ball at the ends of pushers (9,
10) (2 used for each).
10. Apply grease to the joint part of universal joint
(15).
11. Apply grease to the inner surface of oil seals
(11) (4 used).
NOTE: Spool (12) and oil seal (11) must be
replaced as an assembly.
12. Install oil seals (11) (4 used) to sleeves (12) (4
used). Push the sleeves (12) (4 used) assembly
by hand until O-ring (13) is inserted into the hole
on sleeves (12) (4 used).
13. Clamp casing (18) in a vise lightly.
IMPORTANT: Align the bolt hole on plate (14) with
the screw hole on casing (18).
14. Apply LOCTITE #262 to the thread part of
universal joint (15). Place plate (14) on casing
(18) and install universal joint (15).
: 17 mm
: 24.5 N⋅m (2.5 kgf⋅m, 18 lbf⋅ft)
IMPORTANT: Check the tightness of cam (16).
15. Install cam (16) to universal joint (15). The
clearance between cam (16) and pushers (9, 10)
(2 used for each) should be 0 to 0.2 mm (0 to
0.008 in).
16. Secure cam (16) by using a spanner. Tighten
screw joint (17) by using a spanner.
: 19 mm, 32 mm
: 68.4 N⋅m (6.98 kgf⋅m, 50 lbf⋅ft)