SkyTrak 6036 Service Manual - Manual (Page 301)

8.85 Model 6036 Legacy
Hydraulic System
g. Main Control Valve Assembly
This section covers assembly of the outlet, lift/lower,
extend/retract and mid-inlet/outlet sections of the main
control valve (Fig. 8-47, 1).
Note: ALWAYS replace o-rings with new o-rings
lubricated with clean hydraulic oil to help ensure a leak-
proof seal and proper vehicle performance.
Assemble the Outlet Section
1. Assemble the outlet section (Fig. 8-47, 6) in the
reverse order from the disassembling procedure.
Refer to “Disassemble the Extend/Retract and Lift/
Lower Outlet Section” on page 8.79.
2. Screw three nuts (Fig. 8-47, 2 and 3) onto three tie
rods (4 and 5) and insert into the outlet section (6).
Assemble the Main Relief Valve (Outlet Section)
Note: There is a seal and spring kit for assembling the
relief valve.
1. Assemble the main relief valve (Fig. 8 -46, 15) in the
reverse order from the disassembling procedure.
Refer to “Disassemble the Main Relief Valve (Outlet
Section)” on page 8.79.
2. Install the main relief valve (Fig. 8 -47, 15) onto the
outlet section (6).
Assemble the Lift/Lower Section
1. Assemble the lift/lower section (Fig. 8-47, 28) in the
reverse order from the disassembling procedure.
Refer to “Disassemble the Lift/Lower Section” on
page 8.79.
2. Insert the shuttle (Fig. 8-47, 29), spring (30) and
poppet (31) into the section.
3. Place a new oiled o-ring (Fig. 8-47, 7) between the
outlet section (6) and the lift/lower section (28), and
slide the lift/lower section onto the tie rods.
Assemble Relief Valves (Extend/Retract and Lift/Lower
Sections)
On the extend/retract section (Fig. 8-47, 32), both relief
valves (38) are preset at 3250 ±50 psi (224 ±3,5 bar). On
the lift/lower section (28), the relief valve (38) is on the “A”
side and is preset at 3250 ±50 psi (224 ±3,5 bar).
Note: There is a seal and spring kit for assembling the
relief valves.
For each relief valve (Fig. 8 -47, 38):
1. Assemble the relief valve (Fig. 8 -47, 38) in the
reverse order from the disassembling procedure.
Refer to “Disassemble the Relief Valve (Lift/Lower
and Extend/Retract Sections)” on page 8.81.
2. Using a wrench on the body (Fig. 8-47, 55), install
the relief valve (38) into the appropriate section
assembly.
Assemble the Extend/Retract Section
1. Assemble the extend/retract section (Fig. 8-47, 32)
in the reverse order from the disassembling
procedure. Refer to “Disassemble the Extend/
Retract Section” on page 8.79.
2. Insert the shuttle (Fig. 8-47, 33), spring (34) and
poppet (35) into the section.
3. Place a new oiled o-ring (Fig. 8-47, 36) between the
extend/retract section (32) and the lift/lower section
(28) and slide the extend/retract section onto the tie
rods.
Assemble the Mid-Inlet/Outlet Section
1. Assemble the Mid-Inlet/Outlet section (Fig. 8-47, 73)
in the reverse order from the disassembling
procedure. Refer to “Disassemble the Mid-Inlet/
Outlet Section” on page 8.81.
2. Install the shuttle (Fig. 8-47, 72) into the mid-inlet/
outlet section (73).
3. Place a new oiled o-ring (Fig. 8-47, 74) between the
extend/retract section (32) and the mid-inlet/outlet
section (73).
4. Torque the two tie rod nuts (Fig. 8-47, 4) to
43-53 lb/ft (58-72 Nm) and the third tie rod nut (5) to
66-82 lb/ft (89-111 Nm) holding all sections together.
5. Retrieve the attachment tilt, frame sway and auxiliary
assembly. Tighten the three tie rod nuts from this
assembly into the mid-inlet/outlet section. Refer to
“Assemble the Load Sense Outlet Section” on page
8.83, Step 2 for the torque values.
6. Ensure that the large o-ring in the auxiliary
hydraulics section is properly seated between the
auxiliary hydraulics section and the mid-inlet/outlet
section. Refer to “Assemble the Auxiliary Hydraulics
Section” on page 8.83, Step 4.