Danfoss
ET4000 Crimp Machine Operator’s Manual
12 | © Danfoss ET4000 Crimp Machine Operator’s Manual | 2023.02.
AQ439269047772en-000101
Troubleshooting Procedures
Troubleshooting the Danfoss T-441 Electric Pump
PROBLEM
CAUSE
SOLUTIONS (PAGE 13)
Pump/motor does not start
Blown fuse; Improper electrical hookup
Step #1
(cut cord, loose wire, switch malfunctions)
Motor starts but blows fuses
High Amps; Pusher doesn’t advance;
Step #1
Pump binding or scored; Cold oil
Replace Pump
Motor runs - Pusher does not advance
Shuttle stuck open; Pump coupling sheared;
Step #4
Pump unload valve stuck open
Replace pump
Motor runs - Pusher advances but doesn’t
Pump unload valve stuck shut
Replace Pump
develop final crimp pressure, blows fuse
Motor runs - Pusher advances but doesn’t
Relief valve leaking;
Step #3
develop final crimp pressure.
Shuttle valve leaking;
Step #4
Relief valve set low
Step #3
Pusher won’t retract
Shuttle valve stuck closed
Step #4
Erratic Pusher movement
Low oil level;
Step #2,
Worn Seal
Replace Pump
Noisy pump; On start up only (continuous)
Low room temp. - Oil too thick;
Use lighter weight oil
Air leaking - Low oil Level
Step #2
Oil temperature hot
Having unit operate at crimping PSI too long;
Operate for 3 seconds at crimp pressure;
Low oil level:
Step #2,
Pump worn (longer cycle time);
Replace Pump,
Leaking relief valve and /or shuttle valve
Step #3, #4