JLG 740AJ, Service And Maintenance Manual

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SECTION 5 - BASIC HYDRAULIC INFOR M ATION AND SCHE M ATICS
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5. Using a suitable drift drive cylinder rod attach pin
through the aligned holes, taking care to align the
grooved pin holes. Secure the pin in place and torque
the bolt to 285 ft. lbs. (388 Nm). Use JLG Threadlocker
P/N 0100011 on bolts.
6. Remove lifting device and sling. Activate hydraulic sys-
tem.
7. Using all applicable safety precautions, operate the
boom functions. Check for proper operation and
hydraulic leaks. Secure as necessary.
8. Check fluid level of hydraulic tank and adjust as neces-
sary.
Upright Level Cylinder Removal
HYDRAULIC LINES AND PORTS SHOULD BE CAPPED IMMEDIATELY AFTER DIS-
CONNECTING LINES TO AVOID ENTRY OF CONTAMINANTS INTO SYSTEM.
1. Remove the Main Boom. Refer to Main Boom removal.
2. Tag and disconnect hydraulic lines to the main lift cylin-
der. Use suitable container to collect any residual
hydraulic fluid. Cap hydraulic lines and ports.
3. Remove mounting hardware from the main boom lift
cylinder barrel end. Use a suitable brass drift and
hammer to remove main lift cylinder barrel end pin from
Upright and remove main lift cylinder.
4. Disconnect the Upright Level Cylinder as follows:
a. Use a suitable lifting device to support the Upright.
b. Remove mounting hardware securing the Upright
Level Cylinder to the upright. Use a suitable brass
drift and hammer to remove upright level cylinder
barrel end pin from upright and disconnect the
upright level cylinder from the Upright.