Setting Crackpoints; Platform Level Up And Down Crackpoints - JLG 1850SJ Service And Maintenance Manual

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6.11 SETTING CRACKPOINTS

Crackpoints, the point at which a valve is opened enough to

induce movement, must be set for a variety of reasons: when-

ever related valves or cartridges are changed, software is

updated, the UGM is changed, or the boom envelope control

does not seem to be functioning properly.

The crackpoints covered in this section are:

• Platform Level Up and Down,

• Jib Level Up and Down,

• Main Lift Up and Down,

• Main Telescope Out and In.

THE JLG ANALYZER WILL PROMPT USERS FOR A CODE UPON REACHING MENU:

OPERATOR ACCESS. THIS FIVE-DIGIT CODE (33271) WILL DISABLE THE BOOM

ENVELOPE CONTROL. WHEN THE BOOM ENVELOPE CONTROL IS DISABLED,

THE MACHINE MAY TIP IF USED INCORRECTLY.

DO NOT ATTACH THE ANALYZER TO THE CONNECTION PORT IN THE PLAT-

FORM. DO NOT CONDUCT ANY CRACKPOINT SETTINGS FROM THE PLATFORM.

NOTE: Cycle the boom functions (8 to 10 times, 5 seconds in each

direction) prior to setting the crackpoints to ensure the

hydraulic oil is at operating temperature.

NOTE: If ESC

is pressed while calibration readings are being

taken, the calibration will abort, and CAL FAILED will

appear on the analyzer. The previous calibration values

will be used instead. Only press ESC

During all Control System lag times, the analyzer will dis-

play CALIBRATING...

NOTE: To set crackpoints for Platform Level Up and Down, a JLG

analyzer is needed. Have an assistant on hand to help ver-

ify that movement occurs.

1. Connect the JLG analyzer to the machine at the Ground

Controls. Start the engine.

2. Scroll to MENU: OPERATOR ACCESS and press ENTER

3. Enter code 33271 and press ENTER

when instructed

SECTION 6 - JLG CONTROL SYSTEM