Mec Speed Level Series User Manual

Page 150 Speed Level Series - Service & Parts Manual
January 2019Section 9 - Troubleshooting - 3084ES Models
Problem Possible Cause Remedy/Solution
LIFT/LOWER
Platform will not
raise; electric
motor operating.
Excessive weight on platform Reduce weight to rated platform capacity
Lift Relief Valve RV-1 out of
adjustment
Adjust relief valve to rated platform capacity
Lift Valve SV-1 not energized
Check wiring to lift valve. Check for EZ-Cal message
or flash code
Lowering Valve SV-5 stuck open
(located at base of lift cylinder)
Check and remove contamination from valve
Main system pressure inadequate Check pump output pressure
Platform will not
raise; electric
motor NOT
operating.
Level sensor out of level (platform
elevated above 10’)
Reposition machine to firm level surface. Check level
sensor function using EZ-Cal See Diagnostic chart
2e1
Batteries discharged
Will receive 4-4 or 7-7 flash on GP400. Clean,
service and charge batteries
Battery charger may not operate if battery voltage
drops below 20 volts
System interlock Check HELP messages using EZ-Cal
Platform raises
uncommanded
when operating
other functions
Lift Valve SV-1 sticking Clean or replace SV-1 valve
Shuttle Valve LS-2 damaged or
contaminated
Clean or replace LS-2 valve. See hydraulic diagram
for location
Platform will not
lower or lowers
slowly
Maintenance lock in maintenance
position
Return maintenance lock to the stowed position
Lowering valve not energized
Check wiring to lowering valve located on Lift
Cylinder.
Check for EZ-Cal message or Flash code
Lowering valve not shifting Clean debris. Check for damage, replace
Lowering orifice plugged Clean orifice located inside hose fitting on lift cylinder
System interruption Check HELP messages using EZ-Cal
Platform lowers
uncommanded
(drift down)
Lowering Valve SV-5 sticking or
contaminated
Deploy Maintenance Lock!
Remove and clean or replace lowering valve SV5
Cylinder internal seal failure Check, repair seals
Emergency
lowering not
working
Lowering valve not shifting Clean debris, check for damage, replace
Lowering Orifice ORF-3 plugged Clean orifice, located in Lift cylinder hose port.
Emergency Down battery discharged Charge, check charge diode & connections
Emergency Down supply fuse blown Replace fuse, check for shorts in wire and coil
Valve coil failed on cylinder Test, replace
Problem Possible Cause Remedy/Solution
DRIVE:
No drive function
Drive Valve not shifting
Check electrical connections at drive valve, check
drive valve for contamination.
Lift/Drive select switch malfunction Check continuity through switch
Drive system interlock Check HELP and MODE messages on EZ-Cal
Drive operates
uncommanded
when operating
other functions
Drive Valve SVD-1 sticking or
damaged
Clean, replace SVD-1 valve. See hydraulic diagram.
Shuttle Valve LS-3 damaged or
contaminated
Clean or replace LS-3 valve. See hydraulic diagram
for location

Mec Speed Level Series Specifications

General

Brand	Mec
Model	Speed Level Series
Category	Boom Lifts
Language	English