JLG 800A_AJ Service Manual - Manual (Page 222)

SECTION 4 - BOOM & PLATFORM
4-8 – JLG Lift – 3120858
4.5 UPRIGHT
Removal
HYDRAULIC LINES AND PORTS SHOULD BE CAPPED IMMEDI-
ATELY AFTER DISCONNECTING LINES TO AVOID ENTRY OF CON-
TAMINANTS INTO SYSTEM.
1. Remove the upper boom. Refer to Section 4.4,
Upper Boom.
2. Tag and disconnect hydraulic lines to the upper lift
cylinder. Use a suitable container to collect any
residual hydraulic fluid. Cap hydraulic lines and
ports.
3. Remove mounting hardware from Upper lift Cylinder
barrel end. Using a suitable brass drift and hammer,
remove pin #1 from Upright and remove Upper Lift
Cylinder.
4. Disconnect wiring harness to horizontal limit switch.
5. Disconnect the Upright Level Cylinder as follows:
a. Using a suitable lifting device, support the
Upright.
b. Remove mounting hardware securing hose
bracket in upright, and remove the hose bracket.
c. Remove mounting hardware securing the
upright level cylinder to the upright. Using a suit-
able brass drift and hammer, remove pin #3
from upright and disconnect the upright level
cylinder from the upright.
6. Remove mounting hardware from the Upright Pivot
Pin using a suitable brass drift and hammer. Remove
pin # 4 from tower boom assembly and remove the
upright from the machine.
NOTE: Steps 7 thru 10 are only necessary if the upright
level cylinder is to be removed.
7. With upright removed, override tower telescope limit
switch and extend the tower boom to gain access to
the upright level cylinder rod end attach pin.
8. Tag and disconnect hydraulic lines to the upright lift
cylinder. Use a suitable container to collect any
residual hydraulic fluid. Cap hydraulic lines and
ports.
9. Using an overhead crane or suitable lifting device,
support the upright lift cylinder, remove mounting
hardware from the barrel end of the upright lift cylin-
der and remove the pin.
10. Carefully remove the upright lift cylinder and place
on a suitable work surface.
UPRIGHT LEVEL
CYLINDER
UPPER BOOM
TELESCOPE CYLINDER
UPRIGHT
UPPER BOOM
LIFT CYLINDER
Figure 4-6. Location of Components - Upright