JLG 3369electric, Service And Maintenance Manual

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SECTION 2 - PROCEDURES
2-6
– JLG Sizzor– 3120768
2.11 CYLINDER REMOVAL AND
INSTALLATION
Lift Cylinder Removal
1. Place the machine on a flat and level surface. Start
the motor and raise the platform. Shut down the
motor and attach a suitable lifting device to the plat-
form.
2. Remove the bolt, locknut and keeper shaft securing
the cylinder rod attach pin to the upper inner arm
assembly. Using a suitable brass drift, drive out the
rod end attach pin from the arm assembly.
3. Retract the cylinder rod completely.
4. Tag and disconnect, then cap the lift cylinder
hydraulic lines and ports.
5. Remove the bolt, locknut and keeper shaft securing
the cylinder rod attach pin to the upper inner arm
assembly. Using a suitable brass drift, drive out the
rod end attach pin from the arm assembly.
6. Carefully remove the cylinder from the sizzor lift and
place in a suitable work area.
Lift Cylinder Installation
1. Install lift cylinder in place using a suitable slings,
aligning barrel end attaching pin mounting holes on
lower arm assembly.
2. Using a suitable drift, drive the barrel end attach pin
through the mounting holes in the lift cylinder and
the lower arm assembly. Secure in place with bolt,
locknut and keeper shaft.
3. Remove cylinder port plugs and hydraulic line caps
and correctly attach lines to cylinder ports.
4. Extend the cylinder rod until the attach pin hole
aligns with those in the upper arm assembly. Using a
suitable drift, drive the cylinder rod attach pin
through the aligned holes, taking care to align the
pin retaining holes with the hole on the arm assem-
bly. Secure the pin in place with bolt, locknut and
keeper shaft.
5. Lower platform to stowed position and shut down
motor. Check hydraulic fluid level and adjust accord-
ingly.
2.12 CYLINDER REPAIR
NOTE: The following are general procedures that apply to
all of the cylinders on this machine. Procedures that
apply to a specific cylinder will be so noted.
Disassembly
DISASSEMBLY OF THE CYLINDER SHOULD BE PERFORMED ON
A CLEAN WORK SURFACE IN A DIRT FREE WORK AREA.
6. Operate the hydraulic power source and extend the
cylinder. Shut down and disconnect the power
source. Adequately support the cylinder rod, if nec-
essary.
7. If applicable, remove the cartridge-type holding
valve and fittings from the cylinder port block. Dis-
card o-rings.
8. Place the cylinder barrel into a suitable holding fix-
ture.
Figure 2-1. Barrel Support
Figure 2-2. Capscrew Removal