Hitachi ZX200-5G Workshop Manual page 332

Disassembly of Pilot Valves (Right and Left)
IMPORTANT: Casing (18) is made of aluminium.
Strong force deforms it. Handle it with care.
IMPORTANT: Spool (19) has been selected to match
the hole on casing (18). The dimensions of balance
springs (3, 4) and return springs (5, 6) as well as
those of pushers (9, 10) are different. Arrange
the disassembled parts together with the port in
order not to confuse. The port number is stamped
on the outer surface of casing (18).
IMPORTANT: Do not remove screw joint (17) while
securing casing (18) in a vise. The strong torque
may act on screw joint (17).
1. Secure screw joint (17) in a vise. Turn cam (16) by
using a spanner. Remove screw joint (17).
j : 19 mm, 32 mm
2. Secure the flat surface of casing (18) in a vise.
Remove cam (16) from universal joint (15).
j : 32 mm
SECTION 3 UPPERSTRUCTURE
Group 11 Pilot Valve
W3-11-4-2
3. Attach a spanner onto the upper part of universal
joint (15). Remove universal joint (15).
j : 17 mm
f
NOTE: Universal joint (15) has been secured on casing
(18) by using LOCTITE #262.
4. Remove plate (14).
IMPORTANT: Do not damage sleeve (12). Insert a soft
rubber between sleeve (12) and a tool. Oil seal (11)
cannot be removed from sleeve (12).
Sleeve (12) and oil seal (11) should be replaced as
an assembly.
5. Remove sleeves (12) (4 used) upward by using a pair
of pliers. Remove O-rings (19) (4 used) from sleeves
(12) (4 used).
IMPORTANT: The dimensions of pushers (9, 10) for
ports (1, 3) and for ports (2, 4) are different. Keep
the disassembled parts together by the port
number in order not to confuse.
6. Remove pushers (9, 10) (2 used for each) from
casing (18).