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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 and High Pressure Limit Switches (Fig. 18a)
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.
The high pressure limit switch opens at 5500 PSI (rising
pressure) and closes at 5350 PSI (falling pressure).
DANGER
The accumulator contains nitrogen gas under
high pressure. DO NOT attempt to remove or
Figure 18a
replace these switches without first opening
the high pressure water bleed valve and then
1. High pressure limit switch 2. Accumulator charge switch
releasing pressurized gas from the accumu-
lator (see Accumulator Service in Chapter 6 -
Water System).
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Hydroject 3010 Page 5 - 21 Testing