JLG 150HAX Service Manual - Manual (Page 103)

SECTION 5 - HYDRAULICS
3120817 – JLG Lift – 5-7
Lower Master Level Cylinder Installation
1. With tower boom partly raised and properly sup-
ported, align level cylinder barrel end bushing with
pin attach blocks in turntable and install barrel
attach pin using appropriate brass drift. Secure pin
with bolt and lockwasher.
2. Remove caps from temporary hydraulic lines and
attach to level cylinder ports. Using auxiliary power,
activate swing function and extend cylinder rod until
rod bushing aligns with cylinder rod end attach
points on base boom.
3. Using an appropriate brass drift, drive rod attach pin
through aligned bushing of cylinder rod end and
boom attach points, taking care to align pin attach
hole with hole on boom. Secure rod end attach pin
with bolt and lockwasher.
4. Remove temporary hydraulic lines from cylinder
ports and turntable swing motor hydraulic supply.
Reattach hydraulic supply to swing motor.
5. Remove caps from cylinder hydraulic lines and cor-
rectly install lines to cylinder.
6. Remove supports from boom. Lower tower boom to
stowed position. Check hydraulic fluid level and
adjust accordingly.
Upper Master Level Cylinder Removal
1. With main boom positioned to horizontal and prop-
erly supported, prepare to remove upper master
level cylinder.
2. Loosen and remove setscrews securing upper mas-
ter level cylinder rod attach pin to level links. Using
an appropriate brass drift, drive out level cylinder
rod attach pin.
3. Tag, disconnect and cap hydraulic lines to level cyl-
inder and disconnect supply lines from turntable
swing motor.
NOTE: When disconnecting hydraulic lines, any residual
hydraulic fluid should be drained into a suitable con-
tainer.
4. Make up two temporary hydraulic hoses to carry
power from swing motor supply lines to upper mas-
ter level cylinder. Couple temporary hoses to swing
motor supply hoses and to upper master level cylin-
der. Plug ports in swing motor.
5. After installing temporary hoses, use auxiliary power
and activate swing function to fully retract upper
master level cylinder.
6. Remove temporary hoses from lower master level
cylinder and cap them. Plug cylinder ports.
7. Remove bolt and lockwasher securing level cylinder
barrel attach pin to lower boom. Using an appropri-
ate brass drift, drive out level cylinder barrel attach
pin and remove cylinder from lower boom.
Upper Master Level Cylinder Installation
1. With tower boom at horizontal, align level cylinder
barrel end bushing with pin attach holes in turntable
and install barrel attach pin using appropriate brass
drift. Secure pin with bolt and lockwasher.
2. Remove caps from temporary hydraulic lines and
attach to level cylinder ports. Using auxiliary power,
activate swing function and extend cylinder rod until
rod bushing aligns with cylinder rod end attach
points on level links.
3. Using an appropriate brass drift, drive rod attach pin
through aligned bushing of cylinder rod end and
level link attach points. Secure rod end attach pin
with setscrews.
4. Remove temporary hydraulic lines from cylinder
ports and turntable swing motor hydraulic supply.
Reattach hydraulic supply to swing motor.
5. Remove caps from cylinder hydraulic lines and cor-
rectly install lines to cylinder. Check hydraulic fluid
level and adjust accordingly.