PRESSURE REGULATOR INSPECT/TEST/REPLACE.
This task covers: a. Removal/Installation b. Inspection c. Test
Multimeter (Item 12, Appendix B)
Tool kit, general mechanics (Item 1, Appendix B)
The pressure regulator is removed and installed In accordance with paragraph 2-28.
Inspect pressure regulator for evidence of burning or other damage.
Using multimeter, check supply voltage between terminals 5 and 10 of the pressure control. Supply voltage should
be +24 Vdc. If supply voltage is not present, check wiring.
With MODE CONTROL switch positioned in MANUAL, using multimeter, check voltage between terminal 17 and
ground of the pressure control. Voltage shall be 0. Turn MODE CONTROL switch to AUTO. Voltage shall be +24
Vdc. If voltages are not as stated, replace pressure regulator.
Using multimeter, check voltage between terminals 11 and 12 of the pressure control. Voltage shall increase from
0 to +3 Vdc as ENGINE/PUMP CONTROLLER knob is rotated from minimum to maximum. If voltage is not as
stated, replace pressure regulator.
Using multimeter, check voltage between terminals 1 and 4 and between terminals 6 and 9. Voltage shall be +5
Vdc. If voltage is not as stated, replace pressure regulator.