JLG 4017PS Service Manual - Manual (Page 43)

3-5 3706PS, 3707PS, 4014PS, 4017PS, 33.7, 37.6, 37.7
Boom
9. Support the compensating cylinder (4) and remove
the lock bolt (5) and then the barrel end pin (6).
Lower the compensation cylinder onto the lift/lower
cylinder.
10. Label, disconnect and cap the tilt and auxiliary
hydraulic hoses attached to the machine at the tubes
on top of the boom. Plug and cap the hose ends to
prevent dirt and debris from entering the hydraulic
system.
11. Label, disconnect and cap the hoses on the extend/
retract cylinder.
12. Lower the boom to a level position and place a
suitable support under the rear of the boom.
Reposition the slings to each end of the boom.
13. Remove the lock bolt and pivot pin (7) from rear of
first boom section.
14. Lift the complete boom off machine and set on level
ground or supports being careful not to damage the
tubes on the bottom of the boom.
3.3.2 Complete Boom Installation
Note: Light lubrication of the boom wear surfaces with a
factory authorized grease is recommended to keep the
boom wear surfaces lubricated properly. Lubrication of
the boom wear surfaces is also recommended when the
machine is stored, to help prevent rusting.
1. Park the machine on a hard, level surface, 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.
Note: Grease the boom pivot bore, compensating
cylinder rod ends, lift/lower cylinder rod end and pins
before installing.
4. Using suitable slings, balance the boom assembly,
lift and carefully guide the boom into place. Align the
frame pivot bore with the boom assembly pivot bore.
Install boom pivot pin and lock bolt (7). Apply
Loctite
® 242 TM and torque to 90 Nm (66 lb-ft).
5. With the sling still in place, install the compensating
cylinder (4), pin (6) and lock bolt (5). Apply Loctite ®
242 TM and torque to 90 Nm (66 lb-ft).
6. With the sling still in place, install the rod end of the
lift/lower cylinder (1), pin (3) and lock bolt (2). Apply
Loctite
® 242 TM and torque to 90 Nm (66 lb-ft).
Note: Raising the boom up or down with the sling may
be necessary so the boom, compensating and lift/lower
cylinder bores can be aligned for easier pin installation.
7. Uncap and connect the previously labeled extend/
retract cylinder hoses to the extend/retract cylinder.
Refer to Section 2.3.3, “Hydraulic Hose Torque
Chart,” for proper hose torque.
8. Uncap and connect the previously labeled tilt hoses
and (if equipped) auxiliary hoses to the appropriate
cylinder. Refer to Section 2.3.3, “Hydraulic Hose
Torque Chart,” for proper hose torque.
9. Install the boom angle sensor arm. Refer to Section
9.12.7, “Boom Angle Sensor.”
10. Start the engine and operate all boom functions
several times to bleed any air out of the hydraulic
system. Check for fluid leaks. Check the hydraulic
fluid level in the tank and add fluid as required.
11. Clean up all debris, hydraulic fluid, etc., in, on, near
and around the machine.
12. Close and secure the engine cover.
13. Remove the Do Not Operate Tag from the ignition
key switch and the steering wheel.
MAM0671
7
MAM0640
2
3
1
4
5
6