SHUTOFF AND ALARM SYSTEM COMPONENTS
TESTING AND ADJUSTING
SHUTOFF AND ALARM SYSTEMS COMONENTS
CONTACTOR SWITCH FOR OIL PRESSURE
Tools Needed:
3P1564 Pressure Gauge (O to 60 psi).
3B7734 Pipe Nipple, 1/8 in. X 3.5 in.
386483 Cap.
Two 3B7263 Pipe Nipples, 1/8 in. X 2 in.
Two 389389 Shutoff Cock Fittings.
Two 1F9369 Tees.
44914 Tee.
Two 5K3772 Hose Assemblies.
884627 Circuit Tester.
TEST EQUIPMENT
1. 3P1564 Pressure Gauge (0 to 60 psi). 2 3B7734
Pipe Nipple. 3.3B6483 Cap. 4. Oil supply line. 5.
3B7263 Pipe Nipple. 6. 3B9389 Shutoff Cock Fitting.
7. 359389 Shutoff Cock Fitting. 8. 1F9369 Tees.
9.5K3772 Hose Assemblies. 10. 44914 Tee.
Test Procedure
1.
Remove the cover of the contactor switch and
disconnect the wires from the normally closed (B
or Blue) terminal.
2.
Disconnect the oil supply line from the contactor
switch and install the test equipment as shown.
3.
Connect the 5K3772 Hose from tee (10) to the
contactor switch. Put the end of the other
5K3772 Hose in a pan.
4.
Connect the 8S4627 Circuit Tester between the
common terminal and the normally closed
terminal. The light of the circuit tester will be
activated.
5.
Close shutoff fitting (7) and open shutoff fitting
(6).
6.
Look at the pressure gauge, start the engine and
run it at low idle rpm. The light must go out, with
an increase in oil pressure, at the specification of
the switch.
7.
Close shutoff fitting (6) and slowly open shutoff
fitting (7) The light must be activated, with a
decrease in oil pressure, at the specification of
the switch.
8.
Stop the engine.
9.
Connect the wire(s) to the normally closed
terminal.
10.
On contactor switches with a button or a control
knob either push the button or turn the knob to
the OFF position.
11.
Close shutoff fitting (7) and open shutoff fitting
(6).
12.
Start the engine and run it at low idle rpm.
13.
Put a jumper wire between the common terminal
and the normally closed terminal. This will check
the system beyond the contactor switch.
14.
Remove the jumper wire.
Adjustment of Earlier Micro Switch Type Contactor
1. Loosen locknut (16) and turn adjustment screw (14)
counterclockwise to make a decrease in the tension of
spring (15).
CONTACTOR SWITCH FOR OIL PRESSURE
(Micro Switch Type)
13. Set for start button. 14. Adjustment screw. 15,
Spring. 16 locknut 17. Contact button.
2.
Disconnect the wires from the normally closed
terminal of the switch.
3.
Start the engine and run it at low idle rpm.
4.
Close shutoff fitting (6) and slowly open shutoff
fitting (7) until the pressure gauge shows the
pressure specification at which the switch must
close with a decrease in pressure. Close shutoff
fitting (7).
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