Lull 644E-42 Operation Manual - Manual (Page 152)

150 Model 644E Origin 3/04
General Maintenance
B. Top Boom Chain Tension Adjustment
(As required)
NOTE: Always perform the ìBoom Chain Tension Checkî on page 149 before
adjusting the boom chain tension.
1. Park the vehicle on level ground. Place the travel select lever in the (N)
NEUTRAL DETENT position, engage the parking brake switch and raise
the boom to a horizontal (level) position. retract the boom completely and
turn the vehicle OFF.
2. Adjust the extend chain by tightening or loosening the retract chain adjust-
ment nut (1) on the front underside of the outer boom (2).
If the chain sag measurement is less than 3.00" (76 mm) the retract chain
adjustment nut needs to be tightened.
If the chain sag measurement is more than 4.00" (102 mm) the retract
chain adjustment nut needs to be loosened.
OT0490
2
1