Lower Boom Lift Cylinder Removal; Lower Boom Lift Cylinder Installation - JLG E450A Service And Maintenance Manual

SECTION 5 - BASIC HYDRAULIC INFORMATION & SCHEMATICS

Lower Boom Lift Cylinder Removal

NOTE: The Lower Lift Cylinder weighs approximately 130lbs.
(59kg).
1. Place machine on flat and level surface. Place the Main
Boom in a horizontal position. Place the Mid and Lower
Booms in a 10 degree elevated position. Support Main
Boom with a prop. Support upright with suitable lifting
device.
2. Using slings, restrain the lower lift cylinder.
3. Remove the hardware securing the cylinder rod attach
pin #5 to the boom. Using an appropriate brass drift,
drive out the cylinder rod attach pin #5.
Figure 5-144. Lower Boom Lift Cylinder Removal
4. Tag and disconnect hydraulic lines from the upper lift
cylinder. Use suitable container to collect any residual
hydraulic fluid. Cap hydraulic lines and ports.
5. Remove the hardware securing the barrel end attach pin
#6 to the boom. Using an appropriate brass drift, drive
out the cylinder barrel pin #6.
6. Carefully remove cylinder from boom. Place in a suitable
work area.
5-128

Lower Boom Lift Cylinder Installation

NOTE: Coat I.D. of bushings with specified lubricant prior to
installing pins.
NOTE: The Lower Lift Cylinder weighs approximately 130lbs.
(59kg).
1. With the booms positioned and supported, place cylin-
der in position and secure in place using slings.
2. Install the cylinder barrel pin #6, being sure to align the
hole in the cylinder barrel pin with the retaining pin
screw hole. When holes align, install hardware.
3. Correctly install hydraulic lines to cylinder as previously
tagged. Extend cylinder rod slowly until attach pin hole
aligns with those in boom.
4. Using a suitable brass drift, drive the cylinder rod attach
pin #5 through the aligned holes. Secure the pin in place
using retaining hardware.
5. Remove boom prop and suitable lifting device.
6. Take the lift cylinder through one complete cycle to
assure correct functioning. Place boom in stowed posi-
tion. Check hydraulic fluid and adjust accordingly.
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