JLG 4017PS Service Manual - Manual (Page 149)

8-17 3706PS, 3707PS, 4014PS, 4017PS, 33.7, 37.6, 37.7
Hydraulic System
b. Reversing Fan Installation
1. Apply Loctite ® 243 TM to all mounting bolts.
2. Install the reversing fan valve (6) with the previously
removed mounting bolts, washers and nuts (8).
Torque as required.
3. Connect the previous labeled connectors (7) to the
proper solenoids (7).
4. Connect the previous labeled four hydraulic hoses to
the fittings on the side and bottom of the reversing
fan valve.
5. 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.
6. If required, fill the hydraulic oil reservoir. Refer to
Section 8.7.2, “Hydraulic Oil Reservoir Filling.”
7. Properly connect the battery.
8. 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.
9. Inspect for leaks and check the level of the hydraulic
fluid in the reservoir. Shut the engine OFF.
10. Wipe up any hydraulic fluid spillage in, on, near and
around the machine, work area and tools.
11. Close and secure the engine cover.
12. Remove the Do Not Operate Tag from the ignition
key switch and the steering wheel.
c. Reversing Fan Test
1. Disconnect solenoid connector HV747 (9).
2. Start the machine and warm the hydraulic system to
operating temperature.
3. Shut off the machine and install a digital or a
34,5 bar (500 psi) gauge to test port (10) on the
reversing fan manifold.
4. Start the machine, run the engine at idle and bottom
the appropriate hydraulic function. Refer to Section
2.3.5, “Engine Fan Speed,” for the correct pressure
rating.
8.10.3 Service Brake Valve
a. Service Brake Valve Removal
1. Park the machine on a firm, level surface, level the
machine, fully retract the boom, lower 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.
3. Open the engine cover. Allow the system fluids to
cool.
4. Properly disconnect the battery.
5. Remove the protective cover from the front of the
cab.
6. Label, disconnect and cap all hoses attached to the
service brake valve (1).
7. Remove the lower dash panel in the cab.
8. Disconnect the service brake pedal linkage from the
valve rod.
9. Remove the two nuts securing the service brake
valve to the cab.
10. Remove the valve through the front of the cab.
Note: DO NOT disassemble the service brake valve.
The service brake valve is not serviceable and must be
replaced in its entirety, if defective.
MAM0560
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