Danfoss ET4001 Operator's Manual page 10

Danfoss ET4001 Crimp machine operator's manual
Troubleshooting procedures
ET4001P-002 electric pump
Back view
Problem
Pump/motor does not start
Motor starts but blows fuses
Motor runs - pusher does not advance
Motor runs - Pusher does not advance
Motor runs - Pusher advances
but doesn't develop final crimp pressure,
blows fuse
Motor runs - Pusher advances
but doesn't develop final crimp pressure
Pusher won't retract
Erratic pusher movement
Noisy pump; On start up only
(continuous)
Oil temperature hot
10 | © Danfoss ET4001 Crimp machine operator's manual | 2022.06.
Cause
Blown fuse; Improper electrical hookup
(cut cord, loose wire, switch malfunctions)
High amps; Pusher doesn't advance;
Pump binding or scored; cold oil
Shuttle stuck open; Pump coupling sheared;
Pump unload valve stuck open
Check valve stuck shut
Solenoid malfunction
Pump unload valve stuck shut
Relief valve leaking;
Shuttle valve leaking;
Relief valve set low
Shuttle valve stuck closed
Low oil level;
Worn seal
Low room temp. - Oil too thick;
Air leaking - Low oil Level
Having unit operate at crimping psi too long;
Low oil level:
Pump worn (longer cycle time);
Leaking relief valve and /or shuttle valve
Front view
Solutions (page 11)
Step #1
Step #1
Replace pump
Step #4
Replace pump
Step #5
Step #5
Replace pump
Step #3
Step #4
Step #3
Step #4
Step #2,
Replace pump
Use lighter weight oil
Step #2
Operate for 3 seconds
at crimp pressure;
Step #2,
Replace pump,
Step #3, #4
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