Disconnect Analyzer And Cycle Ems To Perform Boom Retrieval; Drive & Boom Prevented - Platform Overloaded; Drive Crackpoints Not Calibrated - JLG 1250AJP Troubleshooting Manual

Note Pretest Instructions
1.75.18 Turn on machine and switch
to 500 lb. mode. Take the fol-
lowing readings by back-
probing and grounding
meter near connector.
1.75.19 Turn on machine and switch
to 500 lb. mode. Take the fol-
lowing readings by back-
probing and grounding
meter near connector.

1.76 DISCONNECT ANALYZER AND CYCLE EMS TO PERFORM BOOM RETRIEVAL

Flash Code: 2-5
Disconnect analyzer and cycle ems to perform boom retrieval. The ground module has detected that it needs to use the
backup communications link to the BLAM module but an analyzer is connected. Remove the analyzer and cycle power.
1.77 DRIVE & BOOM PREVENTED - PLATFORM OVERLOADED
Flash Code: 8-2
Drive & boom prevented - platform overloaded. Only applies to machines configured with platform load sensing. Drive and
boom functions will be prevented while the platform is overloaded.

1.78 DRIVE CRACKPOINTS NOT CALIBRATED

Flash Code: 9-9
Drive crackpoints not calibrated. The drive valves require a calibration that has not been performed.
Note Pretest Instructions
1.78.1
1.78.2 Perform dive calibration.
See 5.3 Calibrating Drive on
Pg. 292.
1.78.3
1.78.4 Tee in a 1000 psi pressure
gauge next to the pressure
switch on the traction con-
trol valve manifold
1.78.5 Connect a 1000 psi pres-
sure gauge to the MP port on
the traction control valve
manifold
1.78.6 Disconnect, plug and cap all
four drive hoses at the top of
the swivel (ports 3, 4, 5, and
6). Tee in a gauge with the
hoses at the charge (pres-
sure) filter (on engine side).
Plug open lines.
3128411
SECTION 1 - FAULT DICTIONARY AND SELECTED TROUBLESHOOTING
Test
Move boom such that switch #1 is off cam
and switch #2 is on cam. Is there 12VDC on
MTB passthru - 21 position contact L
[X042.L]?
Move boom such that switch #1 is off cam
and switch #2 is on cam. Is there 12VDC on
ground control module J4 contact 18
[X004.18]?
Test
Are there any Drive faults?
Did calibration complete successfully?
Were there any calibration faults?
While drive is activated in the transport posi-
tion does the gauge read about 500 psi?
With the machine idling, can the pressure be
adjusted with the adjacent charge relief valve
so that the gauge reads 500psi?
Start engine and let it idle. Ensure hydraulic oil
has been warmed up. Does the gauge read
about 500psi?
1250AJP
Result Corrective Action
Yes Keep machine in same condition. Go to step
1.75.19
No Repair/replace harness between MTB passthru -
21 position [X042] and turntable passthru - 21
position [X044]
Yes Reprogram/replace ground control module.
No Repair/replace harness between MTB passthru -
21 position [X042] and ground control module J4
[X004].
Result Corrective Action
Yes Troubleshoot those first
No Go to step 1.78.2
Yes Troubleshooting complete
No Go to step 1.78.3
Yes Troubleshoot all calibration faults
No Go to step 1.78.4
Yes Replace the ground module
No Go to step 1.78.5
Yes Replace the axle lockout valve cartridge
No Go to step 1.78.6
Yes Reassemble, but keep gauge installed.
Go to step 1.78.8.
No Shut down, and reassemble, but keep gauge
installed.
Go to step 1.78.7.
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