Section 10 - Schematics - Mec Speed Level Series Service & Parts Manual

Secton 9 - Troubleshootng - 3084ES Models
Problem
LEVEL, AUTO & MANUAL
Platform is in elevated position or
is perceived to be in the elevated
position.
Elevation is monitored by a sensor
located on left-rear portion of the
No level operation
scissor stack.
System interlock
Level switch/s inoperative
Directional pressure valve not
functioning
Switch or switch wiring problem.
Located inside upper control box
No auto-level
operation; manual
Level Sensor not calibrated
level operates
System Interlock
Unit on too extreme an angle
Level valve sticking
Excessive weight on platform
Pressure relief valve out of
Unit will not
adjustment
accurately level
Tilt sensor not calibrated or not
platform
calibrated properly
Level cylinder valves wired
incorrectly
Level cylinder hoses connected
incorrectly
Counterbalance valve adjustment or
Will not stay level;
failure
drifts down
Failure of cylinder internal seals
Page 153
Possible Cause
Speed Level Seres - Servce & Parts Manual
Remedy/Solution
Use EZ-Cal to monitor platform state of elevation.
See Diagnostic chart I.D. 2a13 for elevated status
and 2e1 for platform % of elevation input. Failure of
the angle transducer will trigger a fault code.
Check HELP messages using EZ-Cal
Check level switch located in the upper control box
Located behind lower control box. Inspect valve for
loss of power, ground or damage.
Check switch and wiring
See Tilt Sensor Calibration instructions found earlier
in this section.
Check HELP messages using EZ-Cal
Relocate unit to more level ground
Inspect/replace valves located behind lower control
box
Reduce weight to 1500 lbs max (680Kg)
Set steering relief valve SV-2 to 2000 PSI (138 bar)
See Tilt Sensor Calibration instructions found earlier
in this section.
Refer to schematic diagram for correct wiring.
See Hydraulic section for hose routing detail
Located on the outrigger cylinder, not adjustable. If
valve is suspect it must be replaced
Inspect and repair as necessary
January 2019