“4069RT” Service and Parts ManualMarch 2014
Page 4-22
TROUBLESHOOTING -- TROUBLESHOOTING CHART
T
ROUBLESHOOTING
C
HART
The following chart is a guide to help the technician find the area of a problem. In order to
benefit from the information, you are advised to fully assess the symptoms by operating all
machine functions. There may be some functions that operate while others may not.
Record this information and proceed down the left-hand column until you find the failure
scenario that best fits the problem. Refer to the information provided to the right for possi-
ble causes and remedies. This unit contains a Microprocessor based control system
which contains various safety features designed to protect itself and the operator in the
event of a failure.
The EZ-Cal scan tool will provide the technician with detailed information related to the
failure. It is strongly recommended that the technician use the EZ-Cal to read any
displayed messages before proceeding to use this Troubleshooting chart.
Information on the use of the EZ-cal tool plus helpful Flow Charts and graphs can be
found earlier in this troubleshooting section. Please read and familiarize yourself with all of
the information provided in the troubleshooting section before attempting to diagnose or
repair the machine.
Table 4-1: Troubleshooting Chart
PROBLEM POSSIBLE CAUSE REMEDY/SOLUTION
General Power Issue
No operation from
Upper or Lower control
station
Main Battery Switch turned OFF Located left of Lower Control Box
Emergency Stop Switch pushed or Ignition
Switch turned OFF
Upper or lower E-Stop will cut all power, as will the Ignition
Switch in the Upper Control Box
Battery discharged or faulty cables Will receive 4-4 or 7-7 flash on GP400.
Clean, service and charge battery - repair cables
Circuit Breaker Tripped Located in Lower Control Box Panel
Look for short circuit and/or damage in wiring or high
amperage draw at valve coils or engine actuators.
Damaged Upper Control Box harness Inspect the harnesses and harness plugs for damage or
broken wires - May receive 6-6 flash code on GP-400 (CAN
bus) or no power at all
Blown supply fuse Locate source of short circuit. Inspect/replace fuse located
just below Main Battery Switch
Other fault in system monitored
by GP400
Check HELP message on EZ-cal or check Flash Code for
error
Functions from Lower
Controls but not from
Upper Controls
Interlock Switch (Joystick) Check power to red wire (power to switch)
and power to purple wire (power out of switch)
at the joystick plug
Lift/Lower
Platform will not raise Excessive weight on platform Reduce weight to within platform capacity
Lift Relief Valve out of adjustment Adjust Relief Valve to rated platform capacity
Lift Valve not energized Check wiring to lift valve
Check for EZ-cal message or flash code
Lowering valve stuck open
(located at base of lift cylinder
Check and remove contamination from valve
Level sensor out of level
(platform elevated above 10')
Reposition machine to firm level surface
Check level sensor function using EZ-cal
Main system pressure inadequate Check pump output pressure
Battery discharged - no charge output Check battery voltage, alternator output (14.5 volts)
Clean, service and charge battery
System interruption Check HELP messages using EZ-cal
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