JLG 4017RS Service Manual - Manual (Page 142)

Hydraulic System
8-12 3614RS, 4017RS
e. Main Control Valve Assembly
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 each Valve Section
1. Reassemble any check valves, compensator valves, anti-
cavitation valves or shock valves from each individual
valve sections if equipped.
2. Install the end caps on each end of the valve section.
Assemble the Main Control Valve.
1. If removed, install all four tie rods into the end main
control valve section.
2. Stand the end main control valve section on end.
3. Install the proper o-rings and load sense shuttle on the
inner face of the end main control valve section. Align
the next valve section over the three tie rods and slide
onto the end main control valve section.
4. Using the proper o-rings and load sense shuttle, repeat
step three for the remaining valve sections and lastly
the inlet end valve section.
5. Install the nuts on the tie rods (6) and torque to 25Nm
(18.5 lb-ft).
f. Main Control Valve Installation
1. Install the main control valve onto the frame, aligning
the bolts with the holes in the end sections of the main
control valve. Slide the main control valve into position,
and tighten the bolts.
2. Prime the main control valve by filling the inlet
openings with fresh, filtered hydraulic oil from a clean
container, before attaching the hoses.
3. Use new oiled o-rings as required. Uncap and connect
all hoses, clamps, etc. to the main control valve.
4. Check the routing of all hoses, wiring and tubing for
sharp bends or interference with any rotating members,
and install tie wraps and/or protective conduit as
required. Tighten all tube and hose clamps.
5. Fill the hydraulic oil reservoir. Refer to Section 8.7.2,
“Hydraulic Oil Reservoir Filling.”
6. Properly connect the battery.
7. Start the engine and run at approximately one-third to
one-half throttle for about one minute without moving
the machine or operating any hydraulic functions.
8. Inspect for leaks and check the level of the hydraulic
fluid in the reservoir. Shut the engine OFF.
9. Wipe up any hydraulic fluid spillage in, on, near and
around the machine, work area and tools.
10. Install main control valve cover.
11. Close and secure the engine cover.
12. Remove the Do Not Operate Tag from the ignition key
switch and the steering wheel.
g. Main Control Valve Test
Conduct a pressure check of the hydraulic system in its
entirety. Adjust pressure(s) as required. Refer to Section 8.5.1,
“Hydraulic Pressures.”