JLG 600A_AJ Service Manual - Manual (Page 224)

SECTION 5 - HYDRAULICS
5-14 – JLG Lift – 3121201
4. With overhead crane supporting upper boom
assembly. Raise boom until tension is released from
cylinder pin #1.
5. Using a suitable drift, drive the barrel end attach pin
#1 through the mounting holes in the upright and
leveling cylinder.
6. Remove the mounting hardware from upright pivot
pin #2 which secures upright to tower boom assem-
bly.
7. Using a suitable drift, drive pivot pin #2 through the
mounting holes in the upright and tower boom
assembly.
8. Using all applicable safety precautions, operate the
overhead crane to move upright and upper boom
assembly forward to clear tower boom.
9. Using all applicable safety precautions, operate the
overhead crane to move upright and upper boom
assembly forward to clear tower boom.
10. After moving assemblies forward, operate overhead
crane to the left far enough to remove leveling cylin-
der.
11. Tag, disconnect and cap hydraulic lines to level cyl-
inder.
12. Remove the mounting hardware from leveling cylin-
der rod end pin #3 which secures cylinder to tower
boom fly assembly.
13. Using a suitable drift, drive leveling cylinder pin #3
through the mounting holes in the tower boom fly
and leveling cylinder, then remove leveling cylinder.
Upright Level Cylinder Installation
1. Place the leveling cylinder in position in the tower
boom, then align holes in tower boom and leveling
cylinder. Install leveling cylinder attach pin #3 using
a suitable rubber mallet.
2. Secure pin to tower boom with mounting hardware.
3. Remove cylinder port plugs and hydraulic line caps
and correctly attach lines to cylinder ports.
4. Using all applicable safety precautions, operate the
overhead crane to move upright and upper boom
assembly in proper position with tower boom.
5. Align holes in upright and tower boom assembly
and install upright pivot pin #2 using a suitable rub-
ber mallet. Secure pin with mounting hardware.
6. Align holes in upright and leveling cylinder barrel
end and install leveling cylinder pin #1 using a suit-
able rubber mallet. Secure pin with mounting hard-
ware.
7. Remove overhead crane from upper boom. Activate
hydraulic system.
8. Using all applicable safety precautions, operate the
boom functions. Check for correct operation and
hydraulic leaks. Secure as necessary.
9. Check fluid level of hydraulic tank and adjust as nec-
essary.