JLG 4017PS Service Manual - Manual (Page 59)

3-21 3706PS, 3707PS, 4014PS, 4017PS, 33.7, 37.6, 37.7
Boom
2. Install the mounting pin (2), spacers and washers
through the second boom section bore and cylinder
barrel. Secure with retaining clips.
3. Uncap and connect the hoses to the previously
labeled fittings at the extend/retract cylinder. Apply
Loctite 545
® to the fittings.
4. Manually pull the third and second boom sections
out until there is access to the extend/retract cylinder
mounting pin bore in the third boom section.
5. Properly connect the battery.
6. Start the machine and extend the extend/retract
cylinder until the rod eye of the cylinder aligns with
the pin bore in the third boom section.
7. Shut the engine OFF.
8. Install the mounting pin (1) and secure with the
retaining clips.
9. Start the machine and cycle the extend/retract
cylinder checking for leaks or any alignment
problems.
3.10 BOOM SECTIONS ADJUSTMENT
3.10.1 Chain Adjustments
The chains are adjusted by tightening and/or backing off
the adjusting nuts at the threaded end of the chains. The
opposite chain adjusting nut usually must be loosened
whenever this procedure is performed.
The chains are properly adjusted whenever the following
parameters are met.
1. Start the machine, level the boom and retract the
extend/retract cylinder completely. Turn OFF engine.
2. At the bottom front of the first boom section, tighten
the retract chain adjusting nut (5) to ensure a gap of
5,0 ± 1,0 mm (0.078 ± 0.016 in) between the clevis
shoulder and the face of the third boom section (6).
3. Tighten the retract chain lock nut (7) to 120 Nm
(86 lb-ft) against the adjusting nut.
4. At the rear of the boom, tighten the retract chain
adjusting nut (8) to ensure a gap of 5,0 ± 1,0 mm
(0.078 ± 0.016 in) between the clevis shoulder and
the face of the first boom section (9).
5. Tighten the retract chain lock nut (10) to 120 Nm
(86 lb-ft) against the adjusting nut.
Note: Ensure that there is a minimum of one full thread
of the clevis showing beyond the lock nut.
6. Tighten both extend chain adjusting nuts (11) until a
torque of 40 Nm (30 lb-ft) is obtained.
7. If necessary, repeat step 6 until extend chain tension
is equal.
8. Start the machine and slowly extend and retract the
boom three times.
9. Retract the extend/retract cylinder completely. Turn
OFF engine
10. Repeat step 6 and 7 if necessary.
11. Tighten both extend chain lock nuts (12) to 120 Nm
(86 lb-ft) against the adjusting nut.
Note: Ensure that there is a minimum of one full thread
of the clevis showing beyond the lock nut.
12. Start the machine and cycle the extend/retract
cylinder to verify the boom extends and retracts
properly.
MAM0970
2
MAM0921
6
11 12
5 7
9
10 8