JLG 1250AJP Troubleshooting Manual page 289

5.1 CALIBRATION INSTRUCTIONS
This machine incorporates a variety of sensors and a high
degree of function interaction. For safety and proper
machine functionality, the calibration procedures must be
repeated for any control module replacement, system cal-
ibration related fault, or removal or replacement of any
sensors, valves, coils, motors, or pumps. The chart below
lists the calibrations required and potential reasons for re-
calibration.
All calibration procedures are menu driven through the
use of the standard JLG analyzer. With the exception of
steering calibration, no external tools are required to com-
plete the calibration procedures. The user is prompted to
exercise the machine in a specific order to use the
machines physical properties to consistently establish
sensor response and the interaction of valves, pumps,
and motors. Steering calibration also uses the analyzer
and is performed on one side of the machine at a time
requiring the use of a string or other means to determine
when the tires are in line with each other. With the excep-
tion of the load control calibration, all calibrations are
accessed by connecting the analyzer into the control sys-
tem inside the main terminal box or on the bottom of the
platform control box. Calibration of the platform load sens-
ing system is accessed by connecting the analyzer
directly into the LSS module.
Table 5-1. Calibrations Listed by Symptom
Symptom
Boom control system inaccuracy
Drive lugs engine
Drive pulls to one side
Load control inaccuracy
Platform leveling erratic
Speed control for slow speed is poor
Tilt indication inaccuracy
Wheel misaligned persistently
Table 5-2. Calibrations Listed by Service Action
Service Action
BLAM removal
BLAM replacement
Chassis Module replacement
Drive pump/coil replacement
LSS module replacement
Ground Module removal
3128411
SECTION 5. CALIBRATIONS
Calibration
Boom Sensors
Drive
Drive
Platform Load Sensing
Platform Level Crack Point
Drive
Chassis Tilt
Steering
Calibration
Boom Sensors
Boom Sensors
Drive
Steering
Drive
Platform Load Sensing
Boom Sensors
Chassis Tilt
1250AJP
SECTION 5 - CALIBRATIONS
Table 5-2. Calibrations Listed by Service Action
Service Action
Ground Module replacement
Load cell removal or replacement
Load pin removal or replacement
Main boom angle sensor removal or
replacement
Main lift valve/control module replacement Boom Valve
Main terminal box removal or replacement Chassis Tilt
Platform level valve/coil replacement
Platform module replacement
Steer Angle Sensor replacement
Tower boom angle sensor removal or
replacement
Tower boom length sensor removal or
replacement
Tower lift cylinder angle sensor removal or
replacement
Tower lift valve/control module replace-
ment
Tower telescope valve/control module
replacement
Calibration
Boom Sensors
Chassis Tilt
Drive
Platform Level Crack Point
Steering
Platform Load Sensing
Boom Sensors
Boom Sensors
Platform Level Crack Point
Platform Level Crack Point
Steering
Boom Sensors
Boom Sensors
Boom Sensors
Boom Valve
Boom Valve
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