SkyTrak 6036 Service Manual - Manual (Page 89)

3.49 Model 6036 Legacy
Boom
12. Recheck the measurement (Fig. 3-103, 1) from the
top rear edge of the intermediate boom (2) to the top
rear edge of the inner boom (3).
Note: If, by adjusting the retract locknut (Fig. 3-104, 1),
you still cannot get the the measurement range of 8.0"
(203 mm) to 8.5" (216 mm), the boom may require
extensive adjustment and/or repair. Contact the JLG Ser-
vice Department or the nearest JLG Authorized Service
Center (ASC).
If the measurement is within the range of 8.0" (203 mm)
to 8.5" (216 mm), measure the extend chain sag again.
13. Start the vehicle and cycle the boom in and out
several times. With the boom horizontal, fully extend
the boom and then retract it 2" (51 mm) (one inch
per section). Turn the engine OFF.
14. Measure the sag in the top boom extend chains
(Fig. 3-105, 1) between the bottom of the extend
chains and the top of the intermediate 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 less than 1.5" (38 mm), the
boom chains need to be adjusted. Continue with the
“Boom Extend Chain Tension Adjustment” to adjust
the extend chains.
Figure 3-105 Measure the Extend Chain-to-Top of
Intermediate Boom Sag at the Closest Point
d. Boom Extend Chain Tension Adjustment
Note: Always perform the “Boom Chain Tension Check”
before adjusting the boom extend chain tension.
1. Place the travel select lever in (N) NEUTRAL, move
the neutral lock lever to the NEUTRAL LOCK
position, engage the parking brake switch and raise
the boom to a horizontal position. Retract the boom
completely and turn the engine OFF.
2. Adjust the two boom extend chains (Fig. 3-106, 1).
Figure 3-106 Boom Extend Chains and Yoke Plates
3. Tighten the two extend chain adjustment locknuts
(Fig. 3 -107, 1) located at the rear of the boom. Be
sure both of the locknuts are tightened equally so
that each extend chain maintains the same tension.
Figure 3-107 Tighten the Extend Chain
Adjustment Locknuts
OA0491
1
2
3
OH0240
1
2
MA6620
1