JLG 1230ES Service Manual - Manual (Page 104)

SECTION 6 - MAST COMPONENTS
6-4 – JLG Lift – 3121222
6.6 PLATFORM ASSEMBLY
Platform - Extending Mast Unpowered
IF LIFT IS DISABLED AND THE MAST CANNOT BE EXTENDED
UNDER THE MACHINE’S OWN POWER, THE PLATFORM MUST BE
HOISTED OR LIFTED BY OTHER MEANS - LIFT PER ILLUSTRA-
TION BELOW - BEFORE EXTENDING THE MAST, PRESS AND
HOLD THE MANUAL DESCENT VALVE BUTTON ON THE FRONT
OF THE MACHINE - WHEN DESIRED PLATFORM HEIGHT IS
REACHED, RELEASE THE MANUAL DESCENT VALVE.
This procedure shows the platform assembly (only)
removal/installation to the mast assembly. The platform
and outer mast section are a one piece manufactured
weldment.
Platform Removal
1. Extend the mast and raise the platform far enough
out of the base assembly to allow access to the slide
pads on the bottom corners of the outer mast sec-
tion, but not to high that you cannot easily get to the
top of the mast to work on it.
2. Support platform for later liting, with either an over-
head crane or a fork truck attaching a lifting strap to
remove the platform once the following steps are
completed. (See Figure 6-5.)
3. Disconnect machine power at the right side battery
tray using the quick disconnect.
4. At the four bottom corners of the outer mast section,
remove the pop rivets securing each slide pad to the
mast section. (See Figure 6-5.) - Item 1. Two (2) riv-
ets per slide pad. The pads may not slide out of the
mast section until the platform is lifted later and the
upper slide pads on outer-mid section pushes them
out.
5. Disconnect the platform control box main harness
connector from the bottom of the platform control
box and allow to hang loose for now. Remove the
platform control box from the platform.
6. Remove the AC outlet receptacle box from the out-
side of the outer mast section. Allow the receptacle
box to hang loose for now.
7. Remove the screws holding the cover plate conseal-
ing the cables for the receptacle box and platform
box to the right side of the mast.
8. At the top of the mast, (See Figure 6-5.) - Item 2) the
cylinder rod for hydraulic cylinder #3 is attached to
platform mast section cross support with a bolt and
nut through a detent on the side of the rod. Remove
the locking nut from the hex head bolt holding the
cylinder rod in place to the mast cross support.
Remove the bolt from the cross support. It may be
necessary to lift or lower slightly on the platform
assembly with the lifting strap to remove the bolt.
9. Also at the top of the mast opening, (See Figure 6-5.)
- Item 3) remove the two (2) bolts and nuts attaching
the power-trak cable guide to the platform rail for the
AC receptacle and platform control station electrical
cables.
NOTE: It may be necessary to pull down or push up on the
rear of the platform to keep the platform level while
lifting it off of the mast assembly.
Figure 6-4. Extending Mast Unpowered
1. Sling Position -1
2. Sling Position - 2 3. Lifting Ring/Hook
4. Manual Descent Valve Location