Technical Bulletin
Parts and Service News
TB-2009-2
Apr 16, 2009
Equipment Affected
All Harlan tractors equipped with the Harlan Shutdown System, Part Number
02060-1031.
Part Description
Figure 1, Harlan Shutdown System Indicator Panel
Figure 2, Harlan Shutdown System Enclosure
Discrepancy
This system should be tested periodically to ensure that it is working as designed.
Possible Failure
If not tested, the system could fail to provide the expected protection.
Correction Procedure
Add the following system test to semi-annual or 500 hour periodic maintenance
requirement.
Page 1 of 6
Technical Bulletin
Parts and Service News
TB-2009-2
Apr 16, 2009
Procedure
Test the Harlan Shutdown System twice a year or every 500 hours of operation to ensure that the
system is functioning properly.
1. Oil pressure test
a. Start the engine.
b. Locate wire #22 connected to NC position on the Oil Pressure Switch mounted to the
right side of the engine.
Figure 3, Oil Pressure Sensor
c. Connect a Ohmmeter between the Common and the Normally Open terminal of the
switch. There should be continuity while the engine is running.
d. Connect the Ohmmeter between Common and the Normally Closed terminals. There
should be no continuity while the engine is running.
e. While the engine is running, short Wire #22 to ground. The audible alarm in the Harlan
Shutdown System should sound immediately. The engine should shut down after about
30 seconds. Remove the shorting wire.
f. While the engine of off, there should be continuity between the Common and the
Normally Closed terminals and no continuity between Common and Normally Open
terminals.
Page 2 of 6
Technical Bulletin
Parts and Service News
TB-2009-2
Apr 16, 2009
2. High temp
a. Start the engine.
b. Locate the temperature switch in the front top on the engine by the radiator hose.
Figure 4, Coolant Temperature Sensor
c. Short the switch to ground (you do not need to remove sensor wire). The audible alarm in
the Harlan Shutdown System should sound immediately. The engine should shut down
after about 30 seconds.
d. To test the temperature sensor:
i.
Heat some cooking oil in a
small pan on a stove to 230o F
or 110o C.
ii.
Remove the sensor from the
engine.
iii.
Connect an Ohm meter to the
sensor. The meter should
indicate no continuity.
iv.
Dip the sensor in the heated
oil. The meter should indicate
continuity.
v.
Allow the sensor to cool and
then re-install it.
Page 3 of 6
Technical Bulletin
Parts and Service News
TB-2009-2
Apr 16, 2009
3. Coolant Level
a. Start the engine.
b. Locate the single yellow wire within the harness cluster against the left firewall behind
engine.
Figure 5, Coolant Level Signal Wire
c. Unplug the wire. The audible alarm in the Harlan Shutdown System should sound in
about 10 seconds. The engine should shut down after about 30 seconds after the alarm
sounds.
d. To test the sensor, start when the engine is cool. Siphon the coolant out of the overflow
bottle until the sensors are uncovered. The audible alarm in the Harlan Shutdown System
should sound in about 10 seconds. The engine should shut down after about 30 seconds
after the alarm sounds.
e. Return the coolant to the overflow bottle.
Note: This step requires that the coolant be the correct 50-50 mix of water and anti-freeze.
Page 4 of 6
Technical Bulletin
Parts and Service News
TB-2009-2
Apr 16, 2009
4. Low Fuel
a. Start the engine.
b. Locate the fuel sender on the right side behind starter relay.
Figure 6, Fuel Level Signal Wire
c. Remove the single wire. There should be an audible alarm from the shutdown box. The
engine should shut down in about 30 seconds.
d. If the fuel gauge is working normally, there is no need to test the sensor.
Page 5 of 6
Technical Bulletin
Parts and Service News
TB-2009-2
Apr 16, 2009
5. 15 Second Timer
a. Locate the starter relay on the right side of the engine compartment.
Figure 7, Starter Wire on Starter Relay
b. Disconnect wire #33, the top single large wire on the relay.
Important: Insulate this wire while it is disconnected.
c. Turn the key to start and hold it. You should hear an audible click immediately when the
relay energizes. After about 15 seconds a you should hear a second click as the relay
deenergizes.
d. Reconnect wire #33.
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