JLG 723A Service Manual - Manual (Page 36)

Boom
3-6 L2906H, 2906H, 3507H, 619A, 723A, 29.6LP, 29.6, 35.7
6. With the sling still in place, install the comp cylinder
pin (1) and lock bolt (2). Apply Loctite ® 243 TM and
torque to 90 Nm (66 lb-ft).
7. With the sling still in place, install the rod end of the
lift/lower cylinder (3), pin (4) and lock bolt (5). Apply
Loctite
® 243 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.
8. Uncap and reconnect the extend/retract cylinder
fittings and plugs from extend/retract cylinder hoses.
Attach each hose to the extend/retract cylinder
fittings and tighten until wrench-tight. Mark the fitting,
then tighten each hose firmly 1 to 1,5 flats.
9. Uncap and reconnect both the tilt and auxiliary
hoses. Attach both sets to their appropriate tubes
until wrench-tight. Mark the fitting, then tighten each
hose firmly 1 to 1,5 flats.
10. Properly connect the battery.
11. Start the engine and operate all boom functions
several times to bleed any air out of the hydraulic
system. Check for oil leaks. Check the hydraulic oil
level in the tank and add oil as required.
12. Clean up all debris, hydraulic oil, etc., in, on, near
and around the machine.
13. Close and secure the engine cover.
14. Remove the Do Not Operate Tags from both the
ignition key switch and the steering wheel.
3.4.5 Extend/Retract Cylinder Removal
1. Remove any attachment from the quick attach
assembly. Refer to Section 3.6, “Quick Attach
Assembly.”
2. Park the machine on a hard, level surface, extend
the boom approximately 1 m (3 ft) to gain access to
the extend/retract cylinder pin in the second boom
section, level the boom assembly, place the
transmission control lever in (N) NEUTRAL, engage
the park brake and shut the engine OFF.
Note: The boom must be properly aligned (level) with
the access hole at the rear of the frame to allow removal
of the extend/retract cylinder barrel mounting pin.
3. Place a Do Not Operate Tag on both the ignition key
switch and the steering wheel, stating that the
machine should not be operated.
4. Open the engine cover. Allow the system fluids to
cool.
5. Properly disconnect the battery.
6. Remove the cylinder rod eye snap rings and
mounting pin (6) at the side of the second boom
section.
MZ3630
5
4
3
MZ3680
6