Service Manual User Manual

Hydraulic System
9-73
2. Remove the plug (45), poppet (46), back-up rings
(47), and jam nut (48). Keep the back-up rings (47)
for re-use later during assembly.
3. Carefully remove the plug (49) with O-ring (29) from
the housing (51), exposing the spring (36) and pilot
poppet (50). Discard the O-ring (29).
4. Remove the check valve poppet (54) from the
housing (51).
5. Remove the relief valve poppet (53), O-ring (30), and
back-up ring (35). Discard the O-ring (30) and back-
up ring (35).
6. Remove the piston (52), spring (33), back-up ring
(32), O-ring (31), and another back-up ring (32).
Discard the O-ring (31) and back-up rings (32).
7. Remove the spring (34) and O-ring (29) from the
housing (51). Discard the O-ring (29).
Boom Hoist/Lower Section
1. Carefully separate the boom hoist/lower section
assembly (9, Fig. 9– 54) from the outlet section
assembly (7). Remove and discard the O-ring (20).
2. Remove the shuttle (21), spring (25) and poppet (24).
3. Remove the anti-void assembly (26).
Extend/Retract and Hoist/Lower Outlet Section
Remove the shut-off plug assembly orifice (6, Fig. 9– 54)
from the outlet section assembly (7).
d. Main Control Valve Parts Cleaning
Clean all components with a suitable cleaner, such as tri-
clorethylene, before continuing. Blow dry.
e. Main Control Valve Parts Inspection
Inspect all parts and internal passageways for wear,
damage, etc. If inner surfaces of any component do not
display an ultra-smooth, polished finish, or are damaged
in any way, replace the damaged part. Most often, dirty
hydraulic fluid causes failure of internal seals, damage to
the polished surfaces within the component, and wear of
and/or harm to other parts.
Model 3606 • Origin 10/99