SkyTrak 3606 Service Manual - Manual (Page 270)

Section 9
9-76
f. Main Control Valve Reassembly
Note: Always replace O-rings with new O-rings to help
ensure a leak-proof seal and proper vehicle performance.
Attachment and Frame Tilt Outlet Section Assembly
Install a new O-ring (8, Fig. 9– 53), and the SAE plug (7),
into the outlet section assembly (6).
Attachment Tilt Section
The section can be identified by manufacturing markings
made for the inlet (triangle) and outlet (“B”) ports. The
inlet side faces the front of the vehicle when installed; the
outlet faces the rear of the vehicle. Install a new O-ring
(24, Fig. 9– 53) and spool cap (25) in the inlet side lower
port.
1. Secure the seal plate (16, Fig. 9– 53) to the section
assembly (9) with two socket-head capscrews (26).
2. On the outlet (“B”) port side, install a new O-ring (24)
and the spool cap retainer (23) into the lower port.
3. Install new O-rings (21 and 22).
4. Install the spring seat (19), spring (20), another
spring seat (19), spool cap (18), spool end (17), and
seal plate (16).
5. Secure the seal plate (16) to the section assembly (9)
with two socket-head capscrews (15).
6. Install the control valve (C.V.) compensator (14),
spring (13) and shuttle (12) into the attachment tilt
section casting (9).
7. Place a new O-ring (11) between the attachment tilt
section assembly and outlet section assembly (6).
8. Avoid dislodging or loosing the shuttle (12), spring
(13) and control valve (C.V.) compensator (14).
Carefully join the outlet section assembly (6) to the
attachment tilt section assembly (9).
Frame Tilt Section
The section can be identified by markings made for the
inlet (triangle) and outlet (“B”) ports. The inlet side faces
the front of the vehicle when installed; the outlet faces the
rear of the vehicle. Install a new O-ring (24, Fig. 9– 53)
and spool cap (25) in the inlet side lower port.
1. Secure the seal plate (16, Fig. 9– 53) to the section
assembly (10) with two socket-head capscrews (26).
2. On the outlet (“B”) port side, install a new O-ring (24)
and the spool cap retainer (23) into the lower port.
3. Install new O-rings (21 and 22).
4. Install the spring seat (19), spring (20), another
spring seat (19), spool cap (18), spool end (17), and
seal plate (16).
5. Secure the seal plate (16) to the section assembly
(10) with two socket-head capscrews (15).
6. Install the control valve (C.V.) compensator (14),
spring (13) and shuttle (12) into the frame tilt section
casting (10).
7. Place a new O-ring (11) between the attachment tilt
section assembly (10) and frame tilt section
assembly (10) being careful not to dislodge or loose
the control valve (C.V.) compensator (14), spring (13)
or shuttle (12).
Assembling the Relief Valve
The relief valve assembly is part of both the attachment
and frame tilt section assemblies and is preset at 3700±
50 psi (255 ± 3,5 bar).
1. Install the check valve poppet (42, Fig. 9– 53) and
piston (41) into the housing (40).
2. Carefully install the relief valve poppet (43), back-up
ring (29), new O-ring (28), spring (33), new O-ring
(30), back-up ring (31), wave spring (32), pilot poppet
(44), spring (34), new O-ring (36), and plug (45) into
the housing (40).
3. Install a new O-ring (35) into the housing (40) on top
of the plug (45).
4. Thread the jam nut (46) onto the adjustment screw
(47), then thread the adjustment screw and jam nut
into the plug (45) within the housing (40).
5. Install another new O-ring (35) over the jam nut (46)
and adjustment screw (47), then thread the acorn nut
(48) onto the adjustment screw.
6. Place a new O-ring (37) onto the housing and install
the relief valve assembly (27) into the section
assembly (27). Tighten securely.
Assembling the Mid Inlet Section
1. Install a new O-ring (42, Fig. 9– 53), and the SAE
plug assembly (41) and shuttle (40) into the mid inlet
section assembly (37).
2. Install a new O-ring (39, Fig. 9– 53) into the mid inlet
section assembly (37). Carefully attach the boom
extend/retract section assembly (8) with the boom
hoist/lower assembly (9) and outlet section assembly
(7) to the mid inlet section assembly (37).
3. Install a new O-ring (38, Fig. 9– 53). Carefully attach
the frame tilt section assembly (10, Fig. 9– 54) to the
mid inlet section assembly (37, Fig. 9– 53).
Model 3606 • Origin 10/99