AB18EJ&18HJ Maintenance Manual 6-1 © Oct 2020
6 REPAIR PROCEDURES
Repair procedures shall be
completed by a person trained and
qualified on the repair of this
machine.
Immediately tag and remove from
service a damaged or malfunctioning
machine.
Repair any machine damage or
malfuction before operating the
machine.
Before machine startup：
• Read, understand and obey the
safety rules and operating
instructions contained in
operation manual.
• Read all procedures and rules.
• Unless otherwise specified,
perform each repair procedure
with the machine in the following
configuration:
– Machine parked on a firm, level
surface.
– Platform in the stowed
position.
– Key switch in the OFF position
with the key removed.
– All wheels choked.
BOOM AND PLATFORM
COMPONENTS
Boom and Platform Systems
Platform Control Enable System
The platform controls make use of a time dependent
enable circuit to limit the time availability of “live” or
enabled controls. When the footswitch is depressed,
the controls are enabled and the operator has 7
seconds to operate any function. The controls will
remain enabled as long as the operator continues to
use any function and will remain enabled 7 seconds
after the last function has been used. While the controls
are “live”, the enabled light will be illuminated in the
platform display panel. When the time limit has been
reached, the enabled light will turn off and the controls
will be “dead” or disabled. To continue use of the
machine the controls must be re-enabled to start the
timer system over again. This is done by releasing all
functions, then releasing and re-depressing the
footswitch.
Boom Position Sensing System
The boom position sensing system uses 2 angle
sensors mounted in the upper pivot and travel switch
mounted in the main boom to indicate the boom
position. The boom operating position is recognized
when the angle sensor reads more than 0°of main
boom up , or more than –10°of upper secondary boom
up, relative to the horiztonal, or when the travel switch
detects the telescopic boom is not fully retracted,
otherwise it indicates that the boom is in the non-
operating position. The jib boom position is excluded
from consideration.
This system is used to control the following systems：
• Drive speed cutback system
Drive Speed Cutback System
When boom is in operating position, the drive motors
are automatically restricted to the low speed mode.
Platform Controller
ELECTROCUTION HAZARD
Before performing this procedure, be
sure to disconnect the battery and
the charger on AC outlet. Contact
with live conductors may result in
death or serious injury.
NOTICE
Perform this procedure with the machine in stowed
position.
1. Disconnect external power supply, and push in the
emergency stop buttons on the platform and ground
controllers to OFF position.
2. Locate the cable connected to the bottom of the
platform controller.
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