Lull 944E-42 Service Manual - Manual (Page 49)

3-19 944E-42
Boom
a. Component/Assembly Verification
The third to second 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 (2) between the third and second
boom section top plates. The distance should be at least
8.5 in (216 mm) and not greater than 9.5 in (241 mm)
with the boom fully retracted and the chains properly
tensioned. A distance of less than 8.5 in (216 mm) could
result in interference and cause damage to boom
components.
If the distance is less than 8.5 in (216 mm):
1. Tighten the retract chain locknut (3) on the bottom of
the first boom section.
2. Measure the distance and tighten until the distance
is between 8.5 in (216 mm) and 9.5 in (241 mm). If
the locknut cannot be tightened any more, loosen
the locknut until one full thread on the clevis
protrudes beyond the collar of the locknut.
3. Verify that the extend chain clevis (4) is not mounted
in the last hole in the anchor plate. If the clevis can
be moved to the next hole, do so and check the
chain tension. Refer to Section 3.4.5, “Boom Chain
Tension Check.”
4. Measure the distance again and tighten locknut until
the distance is between 8.5 in (216 mm) and 9.5 in
(241 mm).
5. Install the rear boom cover.
6. If the third to second boom separation distance
cannot be achieved, contact your local authorized
service distributor.
If the distance is greater than 9.5 in (241 mm):
1. Loosen the retract chain locknut (3) on the bottom of
the first boom section one or two turns. A minimum
of one full thread on the clevis must protrude beyond
the collar of the locknut.
2. Measure the distance and loosen the locknut until
the distance is between 8.5 in (216 mm) and 9.5 in
(241 mm) or until one full thread on the clevis
protrudes beyond the collar of the locknut.
3. Verify that the extend chain clevis (4) is not mounted
in the first hole in the anchor plate. If the clevis can
be moved to the next hole, do so and check the
chain tension. Refer to Section 3.4.5, “Boom Chain
Tension Check.”
4. Measure the distance again and loosen the locknut
until the distance is between 8.5 in (216 mm) and
9.5 in (241 mm).
5. Install the rear boom cover.
6. If the third to second boom separation distance
cannot be achieved, contact your local authorized
service distributor.
MU0411
2
MU1411
3
MU0211
4