Mec Speed Level 2684 ES, Руководство по обслуживанию и запасным частям

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“3084 Speed Level™ Sigma Lift” Service and Parts Manual November 2009
Page 4b-30
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R O U B L E S H O O T I N G
- 3 0 8 4 E S
M O D E L
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R O U B L E S H O O T I N G
C
H A R T
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
above10') 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
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