Mec Speed Level Series User Manual

Page 152 Speed Level Series - Service & Parts Manual
January 2019Section 9 - Troubleshooting - 3084ES Models
Problem Possible Cause Remedy/Solution
LIFT AND DRIVE
No drive or lift
operation motor
operates
Main Relief Valve RV-3 out of
adjustment
For test purposes, swap RV-3 with RV-2.
Pump or pump coupler failure Inspect, replace as necessary
Diverter Valve EC-1 malfunction Inspect, replace as necessary
Hydraulic tank empty Check, fill with approved oil
No drive or lift
operation motor
does not operate
Motor malfunction Inspect, replace as necessary
System interlock Check HELP messages using EZ-Cal
Battery 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.
Problem Possible Cause Remedy/Solution
STEER
No steer in either
direction
Joystick rocker switch inoperative
Check rocker switch output on green and yellow
wires, input on blue wire.
Steering Valve SV-2 inoperative Check steering valve for power or damage.
System interlock Check HELP messages using EZ-Cal
Hoses connected incorrectly See hydraulic section for correct connection.
Pressure Relief Valve RV-2 set too
low
Set steer relief valve to 2000 PSI
Steers in one
direction only
Steering Valve inoperative or stuck Inspect; replace steering valve
No power to steering coil
Check for power and ground in both directions, repair
wiring
System interlock Check HELP messages using EZ-Cal
Steers but not fully
or steers slowly
One or both steering cylinder
internal seal failure
Check steering cylinder seals, replace
Pressure relief valve set too low Set steer relief valve to 2000 PSI
King pin/s seizing in the bore Disassemble and inspect, repair, replace bushings
Wheels do not stay
in position while
driving
One or both steering cylinder
internal seal failure
Check steering cylinder seals, replace
Steers
uncommanded
Steering Valve SV-2 sticking or
damaged
Remove and inspect for visible debris and stem
straightness, clean with solvent and air
Check Valve CV-1 or CV-2 damaged
or contaminated with debris
Remove and clean or replace check valves see
hydraulic diagram for manifold location

Mec Speed Level Series Specifications

General

Brand	Mec
Model	Speed Level Series
Category	Boom Lifts
Language	English