JLG 150HAX ANSI Service Manual - Manual (Page 100)

SECTION 5 - HYDRAULICS
5-4 – JLG Lift – 3120679
6. Remove two bolts and lockwashers securing each
of two trunnion blocks to base end of mid boom sec-
tion. Remove trunnion blocks.
7. Remove bolt, lockwasher and end cap from each
end of fly attach pin. Using a suitable brass drift,
carefully drive fly attach pin from fly section.
8. Attach a suitable sling to the telescope cylinder rod.
Support with an overhead crane or other suitable lift-
ing device.
9. Using the lifting equipment, carefully pull cylinder
from boom assembly.
10. Using another lifting device, support telescope cylin-
der fly end rod and remove cylinder from boom
assembly. Lower cylinder to the ground or suitably
supported work area.
Tower Telescope Cylinder Installation
1. Using suitable lifting equipment, carefully insert fly
end cylinder rod into boom assembly.
2. Slide cylinder trunnion into appropriate slots inside
mid boom section and secure with two trunnion
blocks, four bolts and lockwashers.
3. Remove cylinder port plugs and hydraulic line caps
and correctly attach lines to cylinder ports.
4. Install cylinder mounting plate on cylinder base end
port block and secure with four bolts and lockwash-
ers.
5. Secure cylinder mounting plate to base boom with
four bolts and lockwashers.
6. Using auxiliary power, extend telescope cylinder
until fly end rod attach bushing is aligned with fly
attach holes in fly boom.
7. Using a suitable brass drift, drive fly attach pin into
fly boom and fly end rod attach bushing. Secure
attach pin with end cap, bolt and lockwasher on
each end of pin.
8. Fully retract boom and shut down engine. Check
hydraulic fluid level and adjust accordingly.
Tower Lift Cylinder Removal
1. Place machine on a flat and level surface. Start
engine and raise tower boom. Shut down engine
and attach a suitable support device to boom.
2. Remove four bolts and lockwashers securing lift cyl-
inder rod attach pin to tower boom. Using a suitable
brass drift, drive out lift cylinder rod attach pin.
3. Using auxiliary power, retract tower lift cylinder rod
completely.
4. Tag, disconnect and cap tower lift cylinder hydraulic
lines and ports.
5. Remove the four bolts and lockwashers securing
barrel end attach pin to turntable. Using a suitable
brass drift, drive out barrel end attach pin from turn-
table.
6. Remove cylinder from boom and place in a suitable
work area.
Tower Lift Cylinder Installation
1. Install lift cylinder in place using suitable slings or
supports, aligning attach pin mounting holes on
turntable.
2. Using a suitable brass drift, drive the barrel end
attach pin through mounting holes in lift cylinder and
turntable. Secure pin in place with four bolts and
lockwashers.
3. Remove cylinder port plugs and hydraulic line caps
and correctly attach lines to cylinder ports.
4. Using auxiliary power, extend cylinder rod until
attach pin hole aligns with those in boom. Using a
suitable drift, drive cylinder rod attach pin through
aligned holes, taking care to align pin retaining plate
holes with holes in boom. Secure pin in place with
four bolts and lockwashers.
5. Place boom in stowed position and shut down
engine. Check hydraulic fluid level and adjust
accordingly.