SkyTrak 8042 Service Manual - Manual (Page 70)

Boom
3-32 6036, 6042, 8042, 10042, 10054
3.7.5 Boom Chain Tension Check
1. Make sure the attachment is attached to the boom
head before doing the tension check.
2. Park the machine on level ground. Place the
transmission control lever in (N) NEUTRAL, engage
the parking brake switch and level the boom.
3. Slowly, fully extend the boom and retract it about
halfway. Fully extend the boom, then retract it 2 in
(51 mm) (one inch per section). Turn the
engine OFF.
4. Measure the sag (1) in each of the boom extend
chains between the bottom of the extend chains and
the top of the boom at their closest point. Acceptable
boom chain sag is between 1.5 in (38 mm) and
2.5 in (64 mm) for the 8042 & 10042 and between
2.85 in (72 mm) and 3.85 in (98 mm).
If the measurement is either less than, or greater
than the range given, the boom chains need to
be adjusted. Continue with Section 3.7.6, “Boom
Chain Tension Adjustment (6036, 6042, 8042 &
10042)” or Section 3.7.7, “Boom Chain Tension
Adjustment (10054),” to adjust the chain system.
5. Start the engine, retract the boom completely and
turn the engine OFF.
3.7.6 Boom Chain Tension Adjustment
(6036, 6042, 8042 & 10042)
Note: Always perform Section 3.7.5, “Boom Chain Ten-
sion Check” before adjusting the boom chain tension.
1. Adjust the two boom extend chains (2).
If the chain sag measurement (1) is less than 1.5 in
(38 mm), tighten the two extend chain adjustment
locknuts (3).
If the chain sag measurement is more than 2.5 in
(64 mm), loosen the two extend chain adjustment
locknuts.
2. Tighten or loosen the two extend chain adjustment
locknuts located at the rear of the boom. Be sure
each of the locknuts are adjusted equally so that
each extend chain maintains the same tension.
Equal chain tension can be checked by the position
of the yoke (4) on the outer boom. The front of the
yoke should be parallel with the front edge of the
outer boom.
OA0493
1
OH0241
2
4
MH1752
3