JLG 1250AJP Troubleshooting Manual page 136

SECTION 1 - FAULT DICTIONARY AND SELECTED TROUBLESHOOTING
active until an EMS cycle, the engine will be stopped if out of transport and pressure is indicated with this fault, and engine
starting will be prevented while out of transport and pressure is indicated by this switch.
Note Pretest Instructions
1.266.1
1.266.2
1.266.3
1.266.4
1.266.5 Tee in a 1000 psi pressure
gauge next to the pressure
switch on the traction con-
trol valve manifold
1.266.6 Connect a 1000 psi pres-
sure gauge to the MP port on
the traction control valve
manifold
1.266.7 Disconnect, plug and cap all
four drive hoses at the top of
the swivel (ports 3, 4, 5, and
6). Tee a gauge in with the
hoses at the charge (pres-
sure) filter (on engine side).
Plug open lines.
1.266.8 Tee a gauge in with the hoses
at the charge filter. Discon-
nect the front drive pump
charge pressure lines (ports
Fa and Fe). A jumper hose
between the fittings on the
pump is required to prevent
pump damage.
1.266.9 Disconnect, plug and cap all
four drive hoses at the bot-
tom of the swivel (ports 3, 4,
5, and 6). Tee a gauge in with
the hoses at the charge filter.
Plug open lines.
1.266.10 Disconnect hoses to trac-
tion valve ports A3, a4, A5,
A6, B3, B4, B5, and B6.
Plug/cap open lines and
ports. Tee a gauge in with the
hoses at the charge filter.
1-136
Test
Is the primary fault, RESTRICTED TO TRANS-
PORT - AXLE LOCKOUT VALVE STB OR OC
present in the fault log?
With the machine idling, does ANALYZER ⇒
DIAGNOSTICS ⇒ SYSTEM ⇒ OSCILATING
AXLE PRES. SW. read CLOSED?
While drive is activated in the transport posi-
tion does ANALYZER ⇒ DIAGNOSTICS ⇒
SYSTEM ⇒ OSCILATING AXLE PRES. SW.
read CLOSED?
While drive is activated in the elevated position
does ANALYZER ⇒ DIAGNOSTICS ⇒ SYS-
TEM ⇒ OSCILATING AXLE PRES. SW. read
OPEN?
While drive is activated in the transport posi-
tion does the gauge read above 200 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?
Start engine and let it idle. Ensure hydraulic oil
has been warmed up. Does the gauge read
about 500psi?
Start engine and let it idle. Ensure hydraulic oil
has been warmed up. Does the gauge read
about 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 Troubleshoot any primary faults first
No Go to step 1.266.2
Yes Go to step 1.266.14
No Go to step 1.266.3
Yes Go to step 1.266.4
No Go to step 1.266.5
Yes Perform drive calibration. See 5.3 Calibrating
Drive on Pg. 292.
No Check the fault log. Troubleshoot any 3-3 codes
in the fault log first
Yes Go to step 1.266.11
No Go to step 1.266.6
Yes Replace the axle lockout valve cartridge
No Go to step 1.266.7
Yes Reassemble, but keep gauge installed. Go to step
1.266.9.
No Shut down, and reassemble, but keep gauge
installed. Go to step 1.266.8.
Yes Repair/replace right side drive pump
No Repair/replace left side drive pump.
Yes Shut down, and reassemble, but keep gauge
installed. Go to step 1.266.10.
No Repair seals in swivel.
Yes Repair drive motor leakage or replace.
No Repair/replace traction valve.
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