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F-75

TROUBLESHOOTING AND REPAIR

F-75

ENGINE FUEL SYSTEM VOLTAGE TESTS (continued)

FIGURE F.28 – PC BOARD

B-1 (-) CHASSIS GROUND

J31-9 (+) OUTPUT TO FUEL SOLENOIDS

J31-1, (+) BATTERY VOLTAGE INPUT AND PUMP

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PROCEDURE

For Code 10856:

1.Place the run/stop switch in the “RUN” position and within 30 seconds, check for battery voltage between terminal J1-9 (+) and terminal J1-5 (-). See Figure #1.

2.Check for battery voltage between terminal J1-1

(+) and terminal J1-5 (-).

If the correct voltage is present for both tests, check the wiring and connections between the PC board and fuel system solenoids and temperature switch. Check the wiring and connections between the solenoids and chassis ground. See the wiring diagram.

If no voltage is present for either test, check the run/stop switch and all wiring and connections between terminal J1-1 and the positive battery terminal. Check all the wiring and connections between J1-5 and the negative battery terminal. See wiring diagram.

If the correct voltage is present for test #2, but not for test #1, and the voltage reading was taken within 30 seconds of placing the run/stop switch in the “run” posi- tion, The PC board is faulty and should be replaced.

IMPORTANT: If the PC board is defective, test the solenoids and engine temperature switch as follows, before installing the new PC board.

3.Disconnect both solenoids and the engine tempera- ture switch, and then check the resistance across each solenoid. See the machine schematic for approximate resistance values. Check the resis- tance between each solenoid and chassis ground, and between the engine temperature switch and chassis ground. The resistance should be very high, 500,000 (500k) Ohms minimum. A qualified Perkins engine technician should repair or replace any defective components before a new PC board is installed.

SAE-400 SEVERE DUTY

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Lincoln Electric SVM187-A service manual Engine Fuel System Voltage Tests, Figure F.28 PC Board

SVM187-A specifications

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