Service Manual

Pump Clutch (Fig. 21)
To test the pump clutch, disconnect the wire connector
and connect a continuity tester or ohm meter across the
terminals of the clutch wire connector. There should be
continuity across the terminals of the clutch connector.
Resistance measured through the clutch coil should be
approximately 3 ohms.
The clutch can also be tested by connecting a 12 VDC
ba
ttery across the clutch connector terminals. The
clutch should engage as 12 VDC is connected to the
clutch connector terminals.
Clutch coil resistance:
1
3.79 Ohms + 5% at 20
o
C (68
o
F)
Figure 21
1. Pump clutch
Valve Clutch (Fig. 22)
To test the valve clutch, disconnect the wire connector
and connect a continuity tester or ohm meter across the
terminals of the clutch wire connector. There should be
continuity across the terminals of the clutch connector.
Resistance measured through the clutch coil should be
approximately 3 ohms.
The clutch can also be tested by connecting a 12 VDC
ba
ttery across the clutch connector terminals. The
clutch should engage as 12 VDC is connected to the
clutch connector terminals.
Clutch coil resistance:
1
3.5 Ohms + 5% at 20
o
C (68
o
F)
Figure 22
1. Valve clutch
HydroJect 3000
Page 5 - 25
Rev. B
Testing