Lull 944E-42 Service Manual User Manual download pdf (Page 86)

100

101

Boom

3.38

Model 644E-42/944E-42 Rev. 6/04

a. Component/Assembly Verification

The inner to intermediate boom 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 between the inner and

intermediate boom top plates (1). The distance should be

at least 8-1/2" (216 mm) and not greater than 9-1/2"

(241 mm) with the boom fully retracted and the chains

properly tensioned. A distance of less than 8-1/2"

(216 mm) could result in interference and cause damage

to other boom components.

If the distance is less than 8-1/2" (216 mm):

1. Tighten the retract chain locknut (3) on the bottom of

the outer boom one or two turns.

2. Measure the distance and tighten until the distance

is between 8-1/2" (216 mm) and 9-1/2" (241 mm). If

the locknut cannot be tightened any more, loosen

the locknut until one full thread on the clevis

protrudes beyond the elastic collar of the locknut.

3. Verify that the extend chain clevis (4) is not mounted

in the last hole (5) in the anchor plate (6). If the clevis

can be moved to the next hole, do so and check the

chain tension. (Refer to Section 3.4.3, “Boom Chain

Tension Check,” and Section 3.4.4, “Boom Chain

Tension Adjustment.”)

4. Measure the distance again and tighten the

locknut (3) until the distance is between 8-1/2"

(216 mm) and 9-1/2" (241 mm).

5. If the extend chain clevis is in the last hole, the

locknut is fully threaded onto the clevis, and the

distance is less than 8-1/2" (216 mm); the chain may

be the incorrect size or over elongated and needs

replacing. (Refer to Section 3.4.1, a. “Inspection

Guidelines.”)

If the distance is greater than 9-1/2" (241 mm):

1. Loosen the retract chain locknut (3) on the bottom of

the outer boom one or two turns. A minimum of one

full thread on the clevis must protrude beyond the

elastic collar of the locknut.

2. Measure the distance and loosen the locknut (3)

until the distance is between 8-1/2" (216 mm) and

9-1/2" (241 mm) or until one full thread on the clevis

protrudes beyond the elastic collar of the locknut.

3. Verify that the extend chain clevis (4) is not mounted

in the first hole (5) in the anchor plate (6). If the

clevis can be moved to the next hole, do so and

check the chain tension. (Refer to Section 3.4.3,

“Boom Chain Tension Check,” and Section 3.4.4,

“Boom Chain Tension Adjustment.”)

4. Measure the distance again and loosen the locknut

(3) until the distance is between 8-1/2" (216 mm)

and 9-1/2" (241 mm).

MU0410

MU1410

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