Yanmar YM155d Service Manual page 137

Cylinder Head Assembly
(Refer ro the diagram on page 132.)
(1) Stop Valve
a.
lnsert the (4) (5) " 0 ring S16, and the (6)
"0" ring P9 into the ( I ) cylinder head, (2) stop
valve seat, and (3) stop valve A.
b.
Screw in the (8) stop valve B from the inside
of the (7) stop valve guide, and attach the (9)
spring pin 5 x 50. The (8) stop valve
B
should ex-
tend out t o the position shown in the illustration.
c. lnsert the (2) stop valve seat and (3) stop
valve A into the (1) cylinder head.
d. Screw i n the stop valve guide (step b) into
the (1) cylinder head.
(2) Safety Valve
a. lnsert the (10) safety valve seat with the
(11) "0" ring P9 into the (1) cylinder head.
b.
lnsert into the assembled parts of step a. the
(12) steel ball 3/16, and the (13) safety valve
spring.
c.
Attach the (14) copper packing 16 and (15)
safety valve plug 16 t o the (1) cylinder head.
(3)
Plug 18
lnsert the (16) "0" ring P I 5 into the cylinder
head and attach the (17) plug 18.
(4) Cylinder Pipe, Hydraulic Piston
a,
lnsert the (18) "0" ring S 63 into the (1)
cylinder head, and attach the (19) cylinder pipe.
b. lnsert the (20) hydraulic piston with the
(21) "0" ring P 5 0 A into the assembled parts
above.
c.
lnsert the (22) "0" ring P I 4 into the (1)
cylinder head.
lnsert the (24) spring washer 12
(4 pcs) in the (23) bolts 12 x 35 (4 pcs), and
attach the parts assembled above t o the hydraulic
cylinder housing.
NOTE:
6.2 Lifting Shaft, Lift Arms, L i f t Crank, Hyd-
raulic Piston Rod Asembly
h
Parts
(7) Srop valve guide
(15) Safety v~alve plug I6
(1 7 ) Plug 18
(23) Bolt 12 x 35 (4 pcs)
(19) Cylinder pipe
(1) lnsert the (2) bush 30 x 3 0 and (3) busn
35 x 30 into the (1) hydraulic cylinder case t o
the position shown i n the illustration.
Tighrming torque
fr-lb (kg-m)
25-36 (35-50)
58-72 (8.0-10.0)
Screw in complerely to
the ( I ) cylinder head
(2) Attach the (5) hydraulic piston rod, (6) lift
crank pin, (7) spring pin 5 x 28, and (8) spring
pin 3 x 28 t o the (4) lift crank.
(3) Place the assembled parts i n section 2 into
the (1) hydraulic cylinder case, and insert the (9)
lifting shaft
(4) Fit the center groove of the (9) lifting shaft
t o the center of the (4) lift crank, and fasten the
(10) lift crank set bolts.
(5) lnsert (1 1) liner 30.5 x 45 x 1 (2 pcs), thei
(15) "0" ring P30 (2 pcs), the (12) lift arm (L)
and the (13) lift arm (R) on the (9) lifting shaft.
(6) Attach the ( 1 4 ) bolts 10 x 45 (2 pcs) s o
there is no play between the (1) hydraulic cylin-
der case and the (12) li?. arm (L) and the
(1-
lift arm (R).
(7) Attach the (16) cylinder case protector t o