Governor Diagnostics (Ford Engines) - Skyjack SJKB-40-D Operating Maintenance Instructions & Part List

BARBER\COLMAN GOVERNOR DIAGNOSTICS (Ford Engines)
1. At carburetor, check movement of throttle shaft. It should move freely and spring return to the idle position.
Repair any binding of the throttle shaft. Repair any binding of the throttle shaft.
2. Locate the electrical connector in the actuator wires, between governor control box and the governor actuator
on the carburetor.
3. Disconnect the connector and using a volt\ohm meter set on the RX10 scale, measure resistance of the
actuator coil. Resistance should be 2.0 OHMS ± .5 OHMS. If reading outside of this range, replace actuator.
Reconnect the connector.
4. Start engine from base control panel.
5. At the governor control, measure voltage between terminals 1 and 2. It should read 12 volts ± 2 volts. If no
voltage present repair wiring between control box and engine terminal strip.
6. Select "Platform" with key select switch.
7. With speed select switch in the low position and the foot switch held down, measure voltage between terminal
7 on the governor control box and a good chassis ground. Reading should be 12 volt ±2 volts. If no voltage
present repair wiring between speed select switch and control box.
8. With speed select switch in the high position and the foot switch held down, repeat step 7 between terminal 8
on the governor control box and a good chassis ground. Reading should be 12 volt ±2 volts. If no voltage
present repair wiring between speed select switch and control box.
9. Measure voltage between terminals 5 and 6 and a good chassis ground. The voltage at each terminal should
be the same and fluctuate with engine RPMs. If no voltage present, repair wiring between governor control box
and the distributorless ignition module. NOTE: The absence of voltage at either terminal 5 or 6 will cause the
governor to operate the engine at double theset RPM.
10. Measure the voltage between terminal 3 and a good chassis ground. It should read12 volts ±2 volts. If no
voltage present, replace governor control box.
11. Attach a volt/ohm meter to terminals 3 and 4. With the foot switch held down activate speed selector switch
from low to high and from high to low and measure voltage. If no voltage present, replace governor control box.
SECTION 5, Page 18
JUN. 1999
SJKB-40-D, SJKB-40-D/F