Eaton 33 User Manual

15EATON EP Control for Heavy Duty Series 2 Piston Pumps Parts & Service 08-10-0002-EN-0901 September 2001
No Flow in Either Defective Power Check Power Input. Disconnect the two-pin connector from the power supply to the
Direction Connection, or EP Control electronic module. Inspect the two connectors for corrosion, loose wires or
Loose Wires broken wires. Measure the DC voltage across pins “A” and “B” at the connector. The
reading should be between 9 to 30 Vdc.
Command Signal Check Command Input Signal. Disconnect the three-pin connector from the command
Missing input device to the EP Control electronic module. Inspect the two connectors for
corrosion, loose contacts, loose wires and broken wires.
If 1-6 Vdc joystick or potentiometer is used, measure the DC voltage across pins “A” and
“B” at the connector. Move the joystick or potentiometer position. The voltage reading
will be approximately 2.5 volts DC at joystick neutral or the half range position of the
potentiometer. The DC voltage will be approximately 5 volts at one end of the joystick or
potentiometer travel. At the opposite end of travel the DC voltage will be approximately
zero.
If ±4-20 mA current loop input is used, measure the DC voltage across pins “A” and “B”
at the connector. The DC voltage reading should be approximately zero at zero input cur-
rent which occurs at command input neutral. The DC voltage reading should be approxi-
mately ±5 volts for input command currents of ±20 mA respectively.
Defective Check Solenoid Coil. Disconnect the two-pin power supply and the three-pin command
Solenoid Coil input device connectors from the EP Control electronic module. Inspect the connectors
for corrosion, loose contacts, loose wires and broken wires. Remove the EP Control
electronic module. Refer to instructions on page 5. Disconnect the two mating four-pin
connectors. Measure the coil resistance across the designated pins at the solenoid
four-pin connector. Refer to the Solenoid 4-pin Connector chart on page 18 for typical
readings.
Defective Check Electronic Module. Disconnect the two-pin power supply and the three-pin
Electronic Module command input device connectors from the EP Control electronic module. Inspect the
connectors for corrosion, loose contacts, loose wires and broken wires. Remove the EP
Control electronic module. Refer to instructions on page 5. Caution: The engine or
motor driving the pump should not
be running. Connect command input device and
power to the module. Measure the current to the coil at the four-pin connector. Activate
the input device end to end and at neutral. Monitor the current on one coil, and then on
the other. Refer to Command Input Device chart on page 18 for typical readings.
Manual Override Check Manual Override. Disconnect two-pin power supply and the three-pin command
Does Not Function input device connectors from the EP Control electronic module. Inspect the connectors
for corrosion loose contacts, loose wires and broken wires. Remove the valve assembly.
Refer to instructions on page 7. Use a small Phillips screwdriver to push on the manual
override of the solenoid tube’s solenoid tube actuator pin.
Flow Only in One Command Signal Check Command Input Signal. Disconnect the three-pin command input device
Direction Incorrect connector from the EP Control electronic module. Inspect the two connectors for
corrosion, loose contacts, loose wires and broken wires.
If 1-6 Vdc joystick or potentiometer is used, measure the DC voltage across pins “A” and
“B” at the connector. Move the joystick or potentiometer position. The voltage reading
will be approximately 2.5 volts DC at joystick neutral or the half range position of the
potentiometer. The DC voltage will be approximately 5 volts at one end of the joystick or
potentiometer travel. At the opposite end of travel the DC voltage will be approximately
zero.
If ±4-20 mA curernt loop input is used, measure the DC voltage across pins “A” and “B”
at the connector. The DC voltage reading should be approximately zero at zero input cur-
rent which occurs at command input neutral. The DC voltage reading should be approxi-
mately ±5 volts for input command currents of ±20 mA respectively.
SYMPTOM CAUSE ACTION
Troubleshooting

Eaton 33 Specifications

General

Brand	Eaton
Model	33
Category	Water Pump
Language	English