PROBLEM REMEDY/SOLUTIONPOSSIBLE CAUSE
"3072ES / 3772ES / 3772ES HD" Service & Parts Manual October 2008
Page 4-33
Drive
Steer
No Speed Selection
Limit switch not functioning Check limit switch located on left rear of base
Check limit switch input with EZ-Cal (EZ-Cal ID# 2d5)
No High Speed Speed/Torque selector switch inoperative
Valve SV4 not functioning
EP2 poppet valve not functioning
Check for 12 volts on all terminals of Speed/Torque switch in Platform
Controls box with drive enabled.
Check voltage and ground to valve
check for faulty valve spool
Check or replace valve
No Mid Speed SV3 or SV4 powered and/or shifted
Speed/Torque selector switch malfunction
These valves should not have 12 volts.
In mid-speed, check valve function
Should not have power at terminals 1 & 3 of Speed/Torque switch in
Platform Controls box with drive enabled
Check for 12 volts on terminals 2 & 3 of Speed/Torque switch in platform
control box with drive enabled.
Check for 12 volts to valve
Check ground to valve
Check for faulty valve spool
Check or replace vavle.
Speed/Torque switch inoperative
Valve SV3 not functioning
EP1 poppet valve not functioning
No low speed
(high torque mode)
No steer in either
direction
Joystick rocker switch inoperative
Steering valve inoperative
System Interruption
Hoses connected incorrectly
Pressure relief valve set too low
Check rocker switch output;
OUTPUT - green and yellow wires.
INPUT - blue wire
Check steering valve for power or damage.
Check HELP and MODE message on EZ-Cal
See hydraulic section for proper connection.
Set steer relief valve to 2000 p.s.i.
Steers in one
direction only
Steering valve inoperative or stuck
No power to steering coil
System Interuption
Inspect – replace steering valve
Check for power and groung in both directions.
Repair wiring
Check HELP and MODE message on EZ-Cal
Steers, but not fully,
or steers slowly
One or both steering cylinder/s internal seal
failure
Pressure relief valve set too low
King pin/s seizing in the bore
Check steering cylinder seals – replace
Set steer relief valve to 2000 p.s.i.
Disassemble and inspect
Repair
Replace bushings
continued…
TROUBLE
Table
continued
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