SkyTrak 8042 Service Manual - Manual (Page 502)

8.87 Model 8042, 10042, 10054 Legacy Rev. 10/03
Hydraulic System
f. Main Control Valve Assembly
This section covers the assembly of the load sense
outlet, auxiliary hydraulics, attachment tilt and frame
sway sections of the main control valve (16).
Note: ALWAYS replace seals, o-rings, gaskets, etc.,
with new parts to help ensure proper sealing and
operation. Lubricate seals and o-rings with clean
hydraulic oil.
Assemble the Load Sense Outlet Section
1. Install a new oiled o-ring (9) and the plug (8) into the
load sense section (3).
2. Loosely install three tie rod nuts (1 and 25) onto tie rods
(2 and 26) and insert into the load sense section (3). At
the end of the assembly procedure when all main
control valve sections are in place, the two tie rod nuts
(1) will be torqued 13-15 lb-ft (18-20 Nm) and the third
tie rod nut (25) to 30-36 lb-ft (41-49 Nm).
Assemble the Auxiliary Hydraulics Section
1. Assemble the auxiliary hydraulics section (4) in the
reverse order of the disassembly procedure. Refer to
“Disassemble the Auxiliary Hydraulic Section” on page
8.79.
2. Insert the spring (5) and poppet (6) into the auxiliary
hydraulics section (4).
3. Place a new oiled o-ring (7) between the auxiliary
hydraulics section (4) and the load sense outlet
section (3), and slide the auxiliary hydraulics section
onto the tie rods.
Assemble the Relief Valves for the Auxiliary Hydraulics
Section (4) and Attachment Tilt Section (10), if installed.
Note: There is a seal and spring kit package for
assembling the relief valves.
1. Assemble the relief valves (15 and 21) in the reverse
order of the disassembly procedure. Refer to
“Disassemble the Relief Valves” on page 8.79.
2. Using a wrench on the body (22), install the relief
valve onto the section.
Assemble the Attachment Tilt Section
1. Assemble the attachment tilt section (10) in the
reverse order of the disassembly procedure. Refer to
“Disassemble the Attachment Tilt Section” on page
8.81.
2. Insert the shuttle (11), spring (12) and poppet (13)
into the attachment tilt (10) section.
3. Place a new oiled o-ring (14) between the
attachment tilt section (10) and the auxiliary
hydraulics section (4), and slide the attachment tilt
section onto the tie rods.
Assemble the Frame Sway Section
1. Assemble the frame sway section (17) in the reverse
order of the disassembly procedure. Refer to
“Disassemble the Frame Sway Section” on page
8.81.
2. Insert the spring (19), poppet (20) and shuttle (18)
into the frame sway section.
3. Place a new oiled o-ring (27) between the frame
sway section (17) and the attachment tilt section (10)
and slide the frame sway section onto the tie rods.
4. Place a new oiled o-ring (24) on the frame sway
section (17), and set entire assembly aside. It will be
attached to the mid-inlet/outlet section (23) via the
tie rods at the end of the assembly procedure.