Troubleshooting - Oshkosh JLG 1930ES Service Maintenance Manual

5.8

TROUBLESHOOTING

It should be noted that there is no substitute for a thor-
ough knowledge of the equipment and related systems.
It should be recognized that the majority of the prob-
lems arising in the machine will be centered in the
hydraulic and electrical systems.
The first rule for troubleshooting any circuit that is
hydraulically operated and electrically controlled is to
determine if the circuit is lacking hydraulic oil and elec-
trical control power. This can be ascertained by overrid-
ing the bypass valve (mechanically or electrically) so
that oil is available to the function valve, then overriding
the function valve mechanically. If the function per-
forms satisfactorily, the problem exists with the control
circuit.
Flash
Help Message
Code
Help Messages with no flash code may occur during normal operation and explain various vehicle interlocks.
0 0 ALARM SOUNDING--TILTED AND ABOVE ELEVATION
0 0 DRIVING AT CUTBACK -- ABOVE ELEVATION
0 0 DRIVE & LIFT UP PREVENTED -- TILTED & ELEVATED
0 0 LIFT UP PREVENTED -- MAX HEIGHT ZONE A
3121656
NOTE: It may also be helpful to do the following for inter-
Table 5-2. Flash Code Listing
Platform is elevated and the chassis is not level.
Platform Position Sensor (PPS) elevation status is elevated and
the vehicle is tilted and machine setup's TILT CUTOUT is config-
ured correctly, see Table 5-4, Machine Configuration Program-
ming Information.
No motion restrictions.
Platform is elevated and the machine is in the drive mode of
operation.
In platform mode, Platform Position Sensor (PPS) elevation
status is elevated and the vehicle is driving and the drive speed
is drive elevated.
Driving at elevated speed.
Driving is not possible since the platform is elevated and the
chassis is not level.
In Platform Mode, Platform Position Sensor (PPS) elevation
status is elevated and the vehicle is tilted and machine setup's
TILT CUTOUT is configured correctly, see Table 5-4, Machine
Configuration Programming Information.
Drive prevented.
Applicable to 3246ES configured for the Zone A/B Capacity
Selection, and operating on Zone A. The vehicle has reached
the maximum height and further lift up motion is not possible.
Machine Setup's CAPACITY SELECT is 1=ZONE A/B and Machine
Setup's MODEL is 3246ES and Zone A Lift Up=False.
Lift up prevented.
SECTION 5 - JLG CONTROL SYSTEM
mittent or difficult problems: run a system test, ANA-
LYZER -> SYSTEM TEST; check the machine
personalities, ANALYZER ->PERSONALITIES (refer to
Table 5-3, Machine Model Adjustment); and check
the machine setup, ANALYZER -> MACHINE SETUP
(refer to Table 5-4, Machine Configuration Program-
ming Information).
These below flash codes apply only to machines
without the MDI (refer to Section 3.7, MDI (Multifunc-
tion Digital Indicator) and Brake Release).
machines with the MDI, refer to Section 6.
Anytime a problem is resolved, recycle the EMS.
Cause
For
Possible Resolve
5-9