Troubleshooting - JLG 1930ES Service Maintenance Manual

5.8

TROUBLESHOOTING

It should be noted that there is no substitute for a thorough knowledge of the equipment and related systems.
It should be recognized that the majority of the problems 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 electrical control power. This can be ascertained by overriding the bypass valve
(mechanically or electrically) so that oil is available to the function valve, then overriding the function valve mechani-
cally. If the function performs satisfactorily, the problem exists with the control circuit.
NOTE: It may also be helpful to do the following for intermittent or difficult problems: run a system test, ANALYZER -> 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 Programming Infor-
mation).
These below flash codes apply only to machines without the MDI (refer to Section 3.7, MDI (Multifunction Digital Indica-
tor) and Brake Release). For machines with the MDI, refer to Section 6, Diagnostic Trouble Codes.
Anytime a problem is resolved, recycle the EMS.
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
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.
– JLG Lift –
SECTION 5 - JLG CONTROL SYSTEM
Cause Possible Resolve
5-9