JLG EcoLift50, Service And Maintenance Manual

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SECTION 3 - COMPONENT SERVICING
3-6 31215861
THE MAST CONTAINS A GAS CHARGED CYLINDER UNDER CONSTANT PRES -
SURE. WHEN THE PLATFORM IS FULLY LOWERED THE GAS IS UNDER THE
MOST PRESSURE.
DO NOT RELEASE THE FLYWHEEL CRANK WITHOUT WEIGHT IN THE PLATFORM
DUE TO THE CONSTANT PRESSURE OF THE GAS CYLINDER.
IF REMOVING THE MAST ASSEMBLY FROM THE MACHINE, THE GAS MUST BE
RELIEVED FROM THE PRESSURIZED GAS CYLINDER.
Mast Disassembly
The mast assembly can be disassembled while on the machine
or removed completely from the machine and disassembled.
1. Remove the tool tray from the top of the mast assem -
bly. (See Section 3.2)
2. Remove the frame cover from the base frame. (See
Section 3.1)
NOTE:
Be sure to have provisions to refill the gas cylinder once
mast is reassembled.
3.
Remove the mast top cover and using the valve on the
top of the gas cylinder, allow all the gas to escape
from the cylinder.
4. Remove the platform from the mast. (See Section 3.6).
5.
Remove the mast from the base frame. If disassem -
bling off the machine.
6.
Remove the flywheel crank cover from the flywheel
crank. (See Section 3.6)
7.
Remove the mast top cap.
8.
With the gas cylinder de-pressurized, loosen,
but do
not remove, the four bolts attaching the gas cylinder
mount to the top of the outer mast section.
9. Check that the mount can be moved up and down by
hand, and there is not a great amount of pressure on
the mount from the gas cylinder. If OK, remove the
bolts from the mount and remove the mount from the
top of the mast.
10.
Remove the safety interlock pin cover and pull the
interlock pin out and rotate 90° to lock the pin in the
retracted position.
11. Remove the outer mast/front cover assembly from the
mast.
a. Remove the 14 screws (7 each side) from the
front cover assembly.
12. The belt drive system clamp assembly which clamps
the belt ends, is anchored to the inner mast section
and must be unbolted.
a.
The head of the belt clamp mounting bolts must
first be aligned with the access hole in the fly -
wheel mounting plate on the front of the mast.
This is so they can be kept from turning while
removing the nuts inside the inner mast section.
b. At the top of the mast assembly approximately 6
in. down on the inside of the inner mast weld -
ment, remove the two lock nuts attaching the
belt clamp assembly to the inner mast weldment.
13. Once step 8 and 9 are completed the complete outer
mast front cover and flywheel assembly can be lifted
off the mast assembly for further disassembly, if
required.
14. Remove the mast guide roller from the bottom front
of the mast assembly.
15. Using an assistant, lift the outer mast section off the
inner mast section and set aside for disassembly, if
necessary.
16.
If necessary, remove the gas cylinder from the inner
mast section. If tight in the mounting hole on the bot -
tom of the inner mast section, you may have to tap
the cylinder rod with a flat punch to get it started out
of the mounting hole.
17. At the top of the inner mast section carefully pull the
gas cylinder out of the inner mast section.
1.
Top Cover 2. Mounting Screws
1. Flywheel Plate Access Hole 2. Belt Clamp Mounting Bolts
NOTE: Extend or retract mast assembly to almost stowed position to align with belt
clamp bolt heads.
1
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