User Manual

ManualsBrandsJLG ManualsSpecial machinery723A Service Manual

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

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). App ly

Loctite

243

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 reco nne ct the ext end /ret rac t cylin der

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 cyl inder 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. P roper l y disconnect the battery.

6. Remove the cylinder rod eye snap rings and

mounting pin (6) at the side of the second boom

section.

MZ3630

MZ3680