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Brake Switch (Fig. 17)
The brake switch is a normally open (N.O.) switch that
closes when the brake is engaged.
To test the brake switch disconnect the wires from the
switch terminals and connect a continuity tester or ohm
meter across the terminals of the switch. With the brake
disengaged, the switch should show no continuity. With
the brake engaged, the switch should show continuity.
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Figure 17
1. Brake switch
Pressure Gauge/Switch (Fig. 18)
The pressure gauge switch is normally open and closes
when inlet water pressure goes above 20 to 30 PSI. The
switch opens when inlet water pressure goes below
approximately 10 PSI.
To test the pressure switch, disconnect the wire connec-
tor and connect a continuity tester or ohm meter across
the terminals of the switch connector. The switch should
show continuity when inlet water pressure reaches 20
to 30 PSI on gauge. The switch should break continuity
as water pressure goes below 10 PSI.
Figure 18
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1. Pressure gauge/switch
Accumulator Charge Switch (Fig. 18a)
(Model 09801)
The accumulator charge switch is normally open and
closes when accumulator charge pressure is greater
than 1800 PSI. The switch opens when accumulator
charge pressure goes below 1400 PSI.
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Figure 18a
1. Accumulator charge switch
HydroJect 3000
Page 5 - 23
Rev. B
Testing