March 2008
"2047ES / 2647ES / 3247ES" Service & Parts Manual - CE Specifications
Page 5-8
PROBLEM
REMEDY/SOLUTION
No drive either
direction
Pump motor
runs while
attempting to
drive
LOW pressure
indicated at
Test Port TP-1
Troubleshooting (continued
POSSIBLE CAUSE
DRIVE
Freewheel Valve NV1 open
Turn counter-clockwise to close
Drive valve SV3 not shifting - no
ground to valve coils on wire
# 151
Check Limit Switch LS1 for sticking or failure
Loosen up with lubricant
Replace
Reduced, slow
or sluggish
drive either
direction
Torque switch
OFF
Freewheel Valve NV1 partially
open
Turn counter-clockwise to close
Brake valve SV5 not shifting
Check power to SV5
Remove SV5 and check for contamination
Replace SV5
Brake valve SV5 not shifting -no
power on wire 19
Check power back to diode board term 3
No drive either
direction
Pump motor
runs while
attempting to
drive
HIGH pressure
indicated at
Test Port TP-1
Counterbalance Valve CBV1
failure
Replace CBV1
Drive valve SV3 not shifting
Check power to SV3
Remove SV3 and check for contamination
Replace SV3
Torque valve/s SV4 & or SV6
sticking
Inspect torque valves SV4 & SV6, replace
Decel valve SV7 inoperative -
earlier units only
Check for power to SV7 while driving
Check valve for contamination
Replace valve
One or both Wheel motors WM1
& WM2 internal bi-pass
Test wheel motors
Replace wheel motors
Limit Switch LS1 inoperative
Check power on wire 22 and 2 in limit switch with
platform below 6 feet.
6- flash code at motor controller
Test potentiometer POT1 for open circuit
Located in upper control box
Replace
Reduced, slow
or sluggish
drive either
direction
Torque switch
ON
One Torque valve SV4 or SV6
not shifting
Check voltage on wire #13 while driving
Check valves for contamination, replace SV4 or SV6
One or both Wheel motors WM1
& WM2 internal bi-pass
Test wheel motors
Replace wheel motors
