Main Tele Flow Control Short To Battery; Main Tele Flow Control Short To Ground; Main Trn Angle Sw Failed - JLG 1250AJP Troubleshooting Manual

SECTION 1 - FAULT DICTIONARY AND SELECTED TROUBLESHOOTING

1.227 MAIN TELE FLOW CONTROL SHORT TO BATTERY

Flash Code: 3-3
Main telescope flow control short to battery. The main telescope proportional valve output [X002.9] is shorted to battery. See
1.377 COMMON STB OR OC PROCEDURE on Pg. 174.

1.228 MAIN TELE FLOW CONTROL SHORT TO GROUND

Flash Code: 3-3
Main telescope flow control short to ground. The main telescope proportional valve output [X002.9] is shorted to ground.
See 1.377 COMMON STB OR OC PROCEDURE on Pg. 174.

1.229 MAIN TRN ANGLE SW FAILED

Flash Code: 8-4
Main transport angle switch failed. The two main boom transport angle switch [X051] inputs at the ground control module
are reading the same state. The normally closed (NC) and normally open (NO) switch inputs should always read opposite. In
the Transport position the NC contacts are closed and the NO contacts are open. Switch states are visible in ANALYZER ⇒
DIAGNOSTICS ⇒ BOOM SWITCHES ⇒ MAIN LIFT ANGLE SWITCH Nx.
Note Pretest Instructions
1.229.1 Disconnect main boom
transport angle switch
[X051]. Turn on machine.
1.229.2 Turn on machine. Take fol-
lowing measurement by
backprobing. See Back-
probing on Pg. 319 for
details.
1.229.3 Turn on machine. ground
multimeter. See Grounding
on Pg. 319 for details. Take
the following measurement
by backprobing.
1.229.4 Turn on machine. Take the
following measurement by
backprobing.
1.229.5 Turn on machine. Ground
multimeter. Take the follow-
ing measurement by back-
probing.
1.229.6 Disconnect main boom
transport angle switch
[X051]. Turn on machine.
Ground multimeter.
1-116
Test
Measure main boom transport angle switch
voltage between socket 1 [X051.1.soc] and
socket 3 [X051.3.soc]. Does it measure
12VDC?
Measure voltage between mtb pass thru - 21
position terminal B [X042.B] and terminal E
[X042.E]. Is it about 12 VDC?
Measure voltage between MTB pass Thru - 21
position terminal B [X042.B] (backprobing)
and ground. Is it about 12 VDC?
Measure voltage between turntable pass thru -
21 position terminal B [X044.B] and terminal E
[X044.E]. Is it about 12 VDC?
Measure voltage between turntable pass thru -
21 position terminal B [X044.B] (backprob-
ing) and ground. Is it about 12 VDC?
Measure main boom transport angle switch
voltage between socket 1 [X051.1.soc] and
Ground. Is it about 12 VDC?
1250AJP
Result Corrective Action
Yes Go to step 1.229.7
No Go to step 1.229.2
Yes Go to step 1.229.4
No Go to step 1.229.3
Yes Repair/replace harness between MTB pass thru -
21 position pin E [X042.E.pin] and MTB ground
bus [X009]
No Repair/replace harness between MTB pass thru -
21 position pin B [X042.B.pin] and Power Down
Relay [X011]
Yes Go to step 1.229.6
No Go to step 1.229.5
Yes Repair/replace harness between turntable pass
thru - 21 position socket E [X044.E.soc] and MTB
pass thru - 21 position pin E [X042.E.pin]
No Repair/replace harness between turntable pass
Thru - 21 position socket B [X044.B.soc] and
MTB pass thru - 21 position pin B [X042.B.pin]
Yes Repair/replace harness between main boom
transport angle switch socket 3 [X051.3.soc]
and turntable pass thru - 21 position pin E
[X044.E.soc]
No Repair/replace harness between main boom
transport angle switch socket 1 [X051.1.soc]
and turntable pass thru - 21 position pin B
[X044.B.soc]
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