Boom Chain Tension Check; Fig. 6-115: Boom Tension Check - JLG Lull 1044C-54 II Series Service Manual

Boom and Transfer

Boom Chain Tension Check

6-108
Regular application of lubricant is necessary to make sure that all working surfaces
are adequately lubricated. In extremely dusty conditions, it may be necessary to
lubricate the chains more often.
Lubrication of chains on vehicles working consistently in extreme hot or cold
conditions requires special consideration. It is important that a reputable
lubrication specialist, consult the local distributor or the JLG Service Department at
1-877-554-5438 or 1-717-485-6657, for guidance.
1. Make sure the carriage is attached to the gooseneck before doing the
tension check.
2. Start the engine. If necessary, attach carriage to gooseneck. Park the
vehicle on level ground. Place the travel select lever in (N) NEUTRAL,
place the neutral lock lever in the (N) NEUTRAL LOCK position,
engage the parking brake switch and raise the boom to a horizontal
(level) position.
3. Lower both outriggers completely.
4. Slowly, fully extend the boom and retract it about halfway. Fully extend
the boom again, then retract it 3" (51 mm) (one inch per section). Turn
the engine OFF.
5. Measure the sag in each of the three boom extend chains (1) between
the bottom of the extend chains and the top of the boom at their closest
point (2). Acceptable boom chain sag (3) is between 1.5" (38 mm) and
2.5" (64 mm). If the measurement is either less than, or greater than
the range given, the boom chains need to be adjusted.
6. Start the engine, retract the boom completely and turn the engine OFF.
Then look at the service oval window at the rear of boom.

Fig. 6-115: Boom Tension Check

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