User Manual

SECTION 2 - PROCEDURES
3120884 – JLG Lift – 2-15
Mid Boom Lift Cylinder Installation.
NOTE: Coat I.D. of bushi ngs with spe cif ied l ubr ica nt pr ior t o
ins talling pins.
1. With the booms positioned and supported, place
cylinder in position and secure in plac e us ing slings .
2. Install the cylinder barrel pin #4, being sure to align
the hole in the cylinder barrel pin with the retaining
pin screw hole. When holes align, install hard ware.
3. Correctly install hydraulic lines to cylinder as previ-
ously 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 #3 through the aligned holes. Secure the
pin in place us ing reta ini ng hardware.
5. Remove boom prop and overhead crane. Take the
lift cylinder through one complete cycle to assure
correct functioning. Place boom in stowed position.
Check hydraulic fluid and adjust accordingly.
Lower Boom Lift Cylinder Removal
1. Place machine on flat and level surface. Place the
Upper Boom in a horizontal position. Place the Mid
and Lower Booms in a 10 degree elevated position.
Support Upper Boom with a prop. Support upright
with an overhead crane.
2. Using slings, restra in 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 cylin der rod attach pin #5.
4. Tag, disconnect and cap the lift cylinder hydraulic
lines an d ports.
5. Remove the hardw are securing the barrel en d 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.
Lower Boom Lift Cylinder Installation
NOTE: Coat I.D. of bush ings wi th spe cif ied lubr ic ant pr io r to
installing pins.
1. With the booms positioned and supported, place
cylinder in position and secure in plac e us ing 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 alig n, install hardware.
3. Correctly install hydraulic lines to cylinder as previ-
ously tagged. Extend cylinder rod slowly until attach
pin hole alig ns with tho s e 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 overhead crane. Take the
lift cylinder through one complete cycle to assure
correct functioning. Place boom in stowed position.
Check hydr aulic fluid and adju st acc ord ingly.
Figure 2-18. Lower Boom Lift Cylinder Removal