JLG 2658E3 Service Manual - Manual (Page 18)

SECTION 2 - PROCEDURES
2-6 – JLG Lift – 3120878
Disassembly of Arms
NOTE: If performing maintenance on any of the arms or arm
bushings be sure and pull the pins outward. DO NOT
try to drive the pins through or they will fall into the
cross tubes of the inner arms.
1. Remove hardware, from the pin, that secures the pin
to the arm.
2. Place a pry bar or suitable prying device behind the
washer and retaining ring and pull the arm pin out.
3. Using a suitable lifting device, lift the arm to be
removed and lower to the ground or suitable sup-
ported work surface.
4. Repeat this, if necessary, in order to perform mainte-
nance on various arms.
NOTE: If the removal of the lift cylinder becomes necessary
refer to lift cylinder removal section, steps 2 through
6.
2.10 LIFT 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
engine and attach a suitable lifting device to the plat-
form.
2. Remove the bolt and locknut 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 lift cylinder rod completely.
4. Tag and disconnect the hydraulic lines, then cap the
lift cylinder hydraulic lines and ports.
5. Remove the bolt and locknut securing the barrel end
attach pin to the lower arm assembly. Using a suit-
able brass drift, drive out the barrel end attach pin
from the arm assembly.
6. Carefully remove the cylinder from the scissor lift
and place in a suitable work area.
Lift Cylinder Installation
1. Install lift cylinder in place using suitable slings,
aligning barrel end attach 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 the
bolt and locknut.
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 hole with the hole in arm assembly.
Secure the pin in place with the bolt and locknut.
5. Lower platform to stowed position and shut down
motor. Check hydraulic fluid level and adjust accord-
ingly.
2.11 LIFT CYLINDER REPAIR
NOTE: The following procedures apply to the lift cylinder
only.
Disassembly
DISASSEMBLY OF THE CYLINDER SHOULD BE PERFORMED ON
A CLEAN WORK SURFACE IN A DIRT FREE WORK AREA. BE
SURE TO CLEAN ALL DIRT OR OTHER FOREIGN SUBSTANCES
FROM CYLINDER OPENINGS - PARTICULARY AT THE HEAD.
1. Connect a suitable auxiliary hydraulic power source
to the cylinder port block fitting.
Figure 2-1. Platform Removal