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F-36

F-36

TROUBLESHOOTING & REPAIR

SHUTDOWN SOLENOID TEST (continued)

FIGURE F.9 - SHUTDOWN SOLENOID LEAD TERMINALS

PULL-IN COIL (LARGER TERMINALS EACH SIDE

#225 AND #262)

SHUTDOWN

SOLENOID

 

HOLD-IN COIL

 

(SMALLER TERMINALS

IDLER

EACH SIDE

SOLENOID

#224 AND #240)

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TEST PROCEDURE

1.Turn the engine off.

2.Unlatch, lift and secure the right side engine service access door. Using a 5/16” nut dri- ver, open up the control panel and tilt out. Remove the control board cover

3.Check the pull-in coil resistance by discon- necting lead #262 from the B2 terminal at the control board and measuring the resis- tance from lead #262 to the ground screw at the control board. Normal coil resistance is approximately 0.4 ohms. Reconnect lead #262 to the B2 terminal at the control board.

Check the hold-in coil resistance by discon- necting J3 & J4 from the control board and measuring across J3 pin 2 to J4 pin 5. Normal coil resistance is approximately 20 ohms. Reconnect J3 at the control board.

If either coil resistance is incorrect, the wiring may be faulty. Inspect the solenoid leads for faulty or loose connections.

If the lead connections are OK, recheck the coil resistances directly across the solenoid. If the coil resistances are incorrect, the sole- noid may be faulty. Replace.

4.Using the external 12VDC voltage supply, apply 12VDC to the larger shutdown sole- noid terminals (#262+ to #225-). The sole- noid should activate.

CAUTION

When the solenoid activates, remove the voltage supply immediately. Do not leave the external supply connected to terminals #262 and #225 for longer than three seconds. Component damage could result.

The solenoid should deactivate when the 12VDC supply is removed.

5.If the solenoid does not operate properly, check for a mechanical restriction in the linkage.

6.Using the external 12VDC voltage supply, apply 12VDC to the smaller solenoid terminals for the hold-in coil, (#240+ to #224-). Push in the solenoid plunger. With 12VDC applied to the hold-in coil, the plunger should stay in until the 12VDC is removed.

7.If the linkage is intact and the solenoid does not operate correctly when 12VDC is applied, the solenoid may be faulty. Replace.

8.Replace the harness leads to the correct ter- minals. See Figure F.9 and the Wiring Diagram. Replace any previously removed wire wraps.

8a. Using the control PC board layout, locate the Q25 on the control board. Scrape the environmental coating from all three legs of the device, and check the resistance between all three legs. If there is continuity between any of the legs, Q23 is bad. Replace the control PC board.

9.Close and secure the right side engine ser- vice access door. Replace the control board cover and close the control panel.

COMMANDER 400

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Lincoln Electric SVM133-B service manual Shutdown Solenoid Test, Figure F.9 Shutdown Solenoid Lead Terminals

SVM133-B specifications

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