Main Angle Movement Without Cmd; Main Angle Sensor Disagreement - JLG 1250AJP Troubleshooting Manual

SECTION 1 - FAULT DICTIONARY AND SELECTED TROUBLESHOOTING

1.189 MAIN ANGLE MOVEMENT WITHOUT CMD

Flash Code: 8-4
Main angle movement without command. The control system detected at least 2.5° of main angle movement in 0.5 seconds,
while the main lift command was not being operated. This is most likely caused by a problem with the hydraulics.
Note Pretest Instructions
1.189.1 Read fault log.
1.189.2
1.189.3 Read fault log.
1.189.4
1.189.5
1.189.6 Swap cartridge from main
lift enable valve [X082] to
tower tele enable valve
[X081].
1.189.7 Rig wires from battery +
and ground to reach the
main lift enable valve
[X082]. Raise main boom.
Do not allow stripped area of
wires to touch each other.
1.189.8 Ensure machine is set up the
same as in step 1.189.7.
Disconnect hose on port 2
from main lift enable valve
[X082].

1.190 MAIN ANGLE SENSOR DISAGREEMENT

Flash Code: 8-4
Main angle sensor disagreement. The BLAM detected a difference between the left and right main boom angle sensors. A
difference greater than 3.0° was held for at least 2.0 seconds.
Note Pretest Instructions
1.190.1
1-104
Test
Does the main lift PVG valve have one or more
faults in the stack?
Open main boom to maximum angle and
return to fully closed. Does fault still occur?
Are there any 3-3 faults regarding main lift pilot
pressure?
Are there visible hydraulic leaks?
Are the main lift cylinder hydraulic connec-
tions good?
Does this fault still occur?
Disconnect main lift enable connector [X082].
Energize main lift enable valve [X082] by
touching wires from battery (+) and (-) wires
to solenoid contacts. Does main boom move
when solenoid is energized?
Disconnect main lift enable connector [X082].
Energize main lift enable valve [X082] by
touching wires from battery (+) and (-) wires
to solenoid contacts. Is there fluid flowing out
of the hose?
Test
Check the fault log for primary faults, MAIN
ANGL1 CAN COMMUNICATIONS LOST, MAIN
ANGL1 INVALID ANGLE, MAIN ANGL2 CAN
COMMUNICATIONS LOST, or MAIN ANGL2
INVALID ANGLE. Are any primary faults
present?
1250AJP
Result Corrective Action
Yes Repair main lift PVG valve in accordance with
fault(s) in stack.
No Go to step 1.189.2
Yes Go to step 1.189.3
No Air was in cylinder. Troubleshooting complete.
Yes Repair machine in accordance with those fault(s)
first.
No Go to step 1.189.4
Yes Repair/replace as needed
No Go to step 1.189.5
Yes Go to step 1.189.6
No Repair as needed
No Repair/replace main lift enable valve [X082]
Yes Go to step 1.189.7
Yes Keep machine in same condition. Go to step
1.189.8.
No Repair/replace main cylinder
Yes Repair/replace main cylinder holding valve
No Repack main cylinder piston seal
Result Corrective Action
Yes Troubleshoot the primary fault before continuing
No Go to step 1.190.2
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