Boom
3-34
31211015 6036, 6042, 8042, 10042, 10054
b. Component/Assembly Verification (10042)
The third (7) to second (8) boom section separation should
be checked when assembling new boom sections or chains,
or when the rear retract chain clevis has been moved forward
on the anchor plate.
Measure the separation (9) between the third and second
boom section top plates. The distance should be at least
18.38 in (467 mm) and not greater than 22.38 in (568 mm)
with the boom fully retracted and the chains properly
tensioned. A distance of less than 18.38 in (467 mm) could
result in interference and cause damage to boom
components.
If the distance is less than 18.38 in (467 mm) or greater than
22.38 in (568 mm):
1. Verify that the retract chain clevis (6) is not mounted in
the last hole in the anchor plate.
2. Make sure that the chain system is properly tensioned.
Refer to Section 3.7.5, “Boom Chain Tension Check”.
3. To increase the separation distance: Loosen the
retract chain locknut (5) on the bottom of the boom
one or two turns and tighten the two extend chain
locknuts equally the same number of turns. A minimum
of one full thread on the clevis must protrude beyond
the collar of the locknut.
4. To decrease the separation distance: Loosen the
extend chain locknuts at the rear of boom equally one
or two turns and tighten the retract chain locknut (5)
the same number of turns. A minimum of one full
thread on the clevis must protrude beyond the collar of
the locknut.
5. Install the rear boom cover.
If the third to second boom separation distance cannot be
achieved, contact your local JLG service distributor.
3.7.7 Boom Chain Tension Adjustment (10054)
a. Outer Boom Chains Tension Adjustment
Note: Always perform Section 3.7.5, “Boom Chain Tension
Check” before adjusting the boom extend chain tension.
1. Adjust the two third boom section extend chains.
If the chain sag measurement (10) is less than
1.5 in (38 mm), tighten the two extend chain adjustment
locknuts (11).
If the chain sag measurement (10) is more than
2.5 in (63,5 mm), loosen the two extend chain
adjustment locknuts (11).
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