SkyTrak 6036 Service Manual - Manual (Page 175)

8-23 6036, 6042, 8042, 10042, 10054
Hydraulic System
8.7 VALVES AND MANIFOLDS
8.7.1 Main Control Valve
The main control valve is mounted on the frame under the
lower transmission cover.
The main control valve assembly consists of individual
working sections with their own valve assemblies, each
providing a specific hydraulic function.
a. Main Control Valve Removal
1. Park the machine on a firm, level surface, level the
machine, fully retract the boom, raise the boom, place
the transmission control lever in (N) NEUTRAL,
engage the park brake and shut the engine OFF.
2. Place a Do Not Operate Tag on both the ignition key
switch and the steering wheel, stating that the
machine should not be operated.
3. Temporarily block up or support the raised boom.
4. Open the rear door. Allow the system fluids to cool.
5. With the engine OFF, operate all the hydraulic
functions to relieve trapped pressure.
6. Remove the transmission covers. Thoroughly clean
the main control valve and surrounding area,
including all hoses and fittings, before proceeding.
7. Place a suitable container to catch hydraulic fluid
drainage beneath the frame.
8. Label, disconnect and cap all the hydraulic hoses,
tubes and wires at the main control valve (7).
9. Wipe up any hydraulic fluid spillage in, on, near and
around the machine and the work area.
10. Record the distance (8) from the outer jam nut to the
end of the ferrule on all cables, to ensure correct
adjustment when reinstalling cables.
Note: Record the location, and label all cables to ensure
correct installation.
11. Disconnect the control cables:
a. Remove the spring pin (9) and anchor pin. Save
the spring pin and anchor pin for installation.
b. Loosen the outer jam nut (10), and remove the
control cable from the bracket. Save the jam nut
for installation.
c. Route the cable clear of the main control valve.
d. Repeat steps for the remaining control cables.
12. Remove the bolts and nuts (9) securing the main
control valve to the frame.
13. Remove the main control valve from the frame.
b. Main Control Valve Disassembly
1. To disassemble the individual sections of the main
control valve, remove the nuts from one end of the
tie rods. Pull the tie rods out through the sections.
2. Disassemble each section assembly as required.
Some sections include a pre-adjusted relief valve that
regulates pressure in a specific circuit.
Note: DO NOT adjust any of the relief valve assemblies.
Tampering with a relief valve will irrevocably alter
pressure in the affected circuit, requiring recalibrating or a
new relief valve.
MH6190
7
MA8482
9
8
10