TroubleshootNg Chart - Mec Speed Level Series Service & Parts Manual

Secton 8 - Troubleshootng - 3084RT Models
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 possible 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.
Problem
General Power Issue
Main Battery Switch turned OFF
Emergency Stop Switch pushed or Ignition
Switch turned OFF
Battery discharged or faulty cables
No operation from Circuit Breaker Tripped
Upper or Lower
control station
Damaged Upper Control Box harness
Blown supply fuse
Other fault in system monitored by GP400
Functions from Lower
Controls but not from Interlock Switch (Joystick)
Upper Controls
Lift/Lower
Excessive weight on platform
Lift Relief Valve out of adjustment
Lift Valve SV-1 not energized
Lowering valve SV-5 stuck open (located
at base of lift cylinder
Platform will not raise
Level sensor out of level (platform elevated
above 10')
Main system pressure inadequate
Battery discharged - no charge output
System interruption
Page 114
Troubleshooting Chart
Possible Cause
Speed Level Seres - Servce & Parts Manual
Remedy/Solution
Located left of Lower Control Box
Upper or lower E-Stop will cut all power, as will the Ignition
Switch in the Upper Control Box
Will receive 4-4 or 7-7 flash on GP400.
Clean, service and charge battery - repair cables
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.
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
Locate source of short circuit. Inspect/replace fuse located just
below Main Battery Switch
Check HELP message on EZ-Cal or check Flash Code for
error
Check power to red wire (power to switch) and power to
purple wire (power out of switch) at the joystick plug
Reduce weight to within platform capacity
Adjust Relief Valve to rated platform capacity
Check wiring to lift valve
Check for EZ-Cal message or flash code
Check and remove contamination from valve
Reposition machine to firm level surface
Check level sensor function using EZ-Cal
Check pump output pressure
Check battery voltage, alternator output (14.5 volts)
Clean, service and charge battery
Check HELP messages using EZ-Cal
January 2019