Basket Leveling Crackpoint Up Not Calibrated - JLG 1250AJP Troubleshooting Manual

SECTION 1 - FAULT DICTIONARY AND SELECTED TROUBLESHOOTING
Note Pretest Instructions
1.19.11 Cap platform valve port L2
and its hose. Install a high
pressure gauge in port M2.
Start engine.

1.20 BASKET LEVELING CRACKPOINT UP NOT CALIBRATED

Flash Code: 8-3
Basket leveling crackpoint up not calibrated. The control system detected there was no stored calibration data for the plat-
form leveling up valve current crackpoint. This could be due to installing a new ground module that has not yet been cali-
brated or prematurely escaping from a level down calibration. A default crackpoint will be assumed, but automatic platform
leveling will be disabled. Platform leveling can still be performed manually, but the BASKET LEVELING SYSTEM TIMEOUT
fault will still be enabled. Complete a level up crackpoint calibration, see 5.6 Calibrating Platform Level on Pg. 302
Note Pretest Instructions
1.20.1 Run a system test
1.20.2
1.20.3 Install a high pressure gauge
on port M1 of the platform
valve. Start engine.
1.20.4 Remove hose from platform
valve port L2. - Cap port L2.
Install a high pressure gauge
on end of hose.
1.20.5 Install a high pressure gauge
on port MP of the platform
valve. Start engine.
1.20.6 Install a high pressure gauge
on port MP1 of the main
valve. Start engine.
1.20.7 Install a high pressure gauge
on port MP1 of the main
valve. Start engine.
1.20.8 Start engine.
1.20.9 Turn off machine. Discon-
nect platform dump sole-
noid [X135].
1-38
Test
Operate level down to end of stroke. Adjust
pressure of the platform level down relief for
2000psi. See Figure 3-3. Platform Valve Lay-
out on Pg. 249 for location. Does gauge read
the proper pressure?
Test
Are there any basket leveling sensor faults?
Complete a level up crackpoint calibration, see
5.6 Calibrating Platform Level on Pg. 302. Did
it complete successfully?
Activate level up to end of stroke. Does gauge
read or adjust to about 3000 psi?
Start engine. Activate level down. Does pres-
sure on gauge read about 3000 psi?
Activate level down to end of stroke. Does
gauge read about 3400psi?
Activate level down to end of stroke. Does
gauge read about 3400psi?
Activate level down to end of stroke. Adjust
high pressure relief to 3400psi. See Figure 3-
2. Pumps Layout on Pg. 248 for location. Can
it be adjusted to proper pressure?
Do the other platform functions operate?
Does the platform dump solenoid [X135]
measure about 6.4 Ω?
1250AJP
Result Corrective Action
Yes Repair/replace platform level cylinder
No Repair/replace platform level down relief
Result Corrective Action
Yes Troubleshoot those faults first.
No Go to step 1.20.2
Yes Troubleshooting complete
No Go to step 1.20.3
Yes Go to step 1.20.4
No Keep machine in same condition.
Go to step 1.20.5.
Yes Repair/replace level circuit check valve
No Repair/replace level cylinder holding valve.
Yes Go to step 1.20.8
No Go to step 1.20.6
Yes Unclog/repair/replace pressure filter at the plat-
form and/or hose from main valve port P3 to plat-
form valve port P .
No Keep machine in same condition.
Go to step 1.20.7.
Yes Inspect/repair/replace hydraulics between main
valve and platform valve, including filter at plat-
form valve.
No Repair/replace function pump and/or high pres-
sure relief
Yes Go to step 1.20.10
No Go to step 1.20.9
Yes Clean/repair/replace platform dump valve [X135]
cartridge.
No Replace platform dump solenoid [X135]
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