Twr Length Sensor One Value Out Of Range High - JLG 1250AJP Troubleshooting Manual

Note Pretest Instructions
1.365.10 Connect a 5000 psi pres-
sure gauge to LS on the main
valve manifold. ANALYZER
⇒ ACCESS LEVEL 1 ⇒
SERVICE MODE ⇒ SET
PRESSURES ⇒
CODE(14605) ⇒ TWR
LIFT? ⇒ WARNING MOVE-
MENT POSSIBLE
1.365.11 Connect a 5000 psi pres-
sure gauge to LS on the main
valve manifold. ANALYZER
⇒ ACCESS LEVEL 1 ⇒
SERVICE MODE ⇒ SET
PRESSURES ⇒
CODE(14605) ⇒ TWR
TELE? ⇒ WARNING MOVE-
MENT POSSIBLE
1.365.12 Disconnect tower tele
enable valve connector
[X081]
1.365.13 Swap the tower tele enable
valve cartridge with the main
lift enable valve cartridge
1.365.14 Raise tower. Disconnect
hose from port 2 of the tower
tele enable valve [X081]

1.366 TWR LENGTH SENSOR ONE VALUE OUT OF RANGE HIGH

Flash Code: 8-4
Tower length sensor 1 (top) value out of range high. The BLAM module is reading a value above 675.4" for the calibrated
tower boom length sensor #1 (top). This sensor should always read between 299.4" and 675.4". This could be caused by a
mechanical problem with the sensor or cable, the sensor ground wire being broken, or a sensor failure.
Note Pretest Instructions
1.366.1
1.366.2 Disconnect tower boom
length sensor #1 (top)
[X093]
1.366.3 Turn on machine. Discon-
nect tower boom length sen-
sor #1 (top) [X093]
1.366.4 Turn on machine. Discon-
nect BLAM J 3 [X088]
3128411
SECTION 1 - FAULT DICTIONARY AND SELECTED TROUBLESHOOTING
Test
WHEN THE STABILITY CONTROL
IS OFF, THE MACHINE WILL TIP IF
USED INCORRECTLY.
While activating tower lift UP , does the gauge
read 2755 to 3088 psi? -AND- While activat-
ing tower lift DOWN, does the gauge read
2755 to 3088?
WHEN THE STABILITY CONTROL
IS OFF, THE MACHINE WILL TIP IF
USED INCORRECTLY.
While activating tower tele OUT, AND while
activating tower tele IN, does the gauge read
2537 to 2871?
Does it measure 4.8 Ω?
Will the tower now extend and is the fault
cleared?
Does fluid flow out of hose continuously?
Test
Is the tower boom length sensor #1 (top)
[X093] securely mounted to the machine and
is cable free to move?
Does the tower boom length sensor #1 (top)
connector [X093] have moisture, damage or
corrosion?
Is there about 5VDC between tower boom
length sensor #1 (top) socket A [X093.A.soc]
and socket B [X093.B.soc]?
Is there about 5VDC between BLAM J 3 pin 7
[X088.7.pin] and pin 9 [X088.7.pin]?
1250AJP
Result Corrective Action
Yes Go to step 1.365.11
No Replace the tower lift PVG Section
Yes Go to step 1.365.12
No Replace the tower tele PVG section
Yes Go to step 1.365.13
No Replace tower tele enable valve solenoid [X081]
Yes Replace the valve cartridge originally from the
tower tele enable
No Go to step 1.365.14
Yes Repair/replace tower tele holding valve
No Repack tower tele cylinder
Result Corrective Action
Yes Go to step 1.366.2
No Repair as needed
Yes Repair as needed
No Keep tower boom length sensor #1 (top) [X093]
disconnected. Go to step 1.366.3
Yes Go to step 1.366.5.
No Keep machine in same state. Go to step 1.366.4
Yes Repair/replace harness between BLAM J3
[X088] and tower boom length sensor #1 (top)
[X093]
No Replace BLAM
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