JLG 24RS Service Manual - Manual (Page 102)

SECTION 4 - BOOM & PLATFORM
4-2 – JLG Lift – 3121287
4.7 EMERGENCY DESCENT SYSTEM
The emergency descent system allows the boom to be low-
ered in the event of power loss. The system uses an electrically
powered valve and the force of gravity to lower the boom. The
Main Lift Down function will operate normally if the engine is
not running and the Auxiliary Power switch has been acti-
vated. The turntable can be swung by also using the Auxiliary
Power switch. To operate the System the operator must follow
the following steps:
a. Push in the Emergency Stop Switch
b. Engage the footswitch
c. Activate Auxiliary Power by holding the switch in
the down position. Once the switch is held in the on
position, it does not need to remain there or be re-
engaged until the function is discontinued. At that
point the switch will need to be re-activated prior to
performing the next function.
d. Perform the function required (only main boom
descent and swing are operable on this model)
4.8 PLATFORM LOAD SENSING SYSTEM (JAPAN)
The Platform Load Sensing System measures the
weight in the platform. The system consists of 4
load cells mounted between the platform and
platform support and an electronic interface
module (EIM) located below the platform con-
sole. When the platform capacity is exceeded, or when there
is a fault in the system, the platform overload indicator will
flash and the platform alarm will sound. All platform controls
(except emergency descent) will be disabled.
4.9 MAIN BOOM
Dissassembly
1. Remove the bolts and washers securing the telescope
attach blocks and shims to the boom base section and
remove the attach blocks and shims.
2. Pull the telescope cylinder rod out and turn the trunnion
plate at the end of the rod 90 degrees so it will clear the
attachment fittings on the boom base section.
3. Remove the bolts, washers, wear pads, and shims from
the front of the boom base section.
4. Remove the upper rear wear pads from the boom fly
section.
5. Pull the boom fly section and telescope cylinder from
the boom base section as an assembly.
6. Remove the rear lower wear pads from the boom fly sec-
tion.