8
2. Start the engine, engage the PTO/clutch switch, briefly advance the engine
to 1200 RPM and return to idle.
3. The TACH calibration will set the EOS-110’s internal tachometer circuit to
match the truck’s tachometer. This test jack voltage will rise and fall with the
engine speed, just as the vehicle’s tachometer. Use the adjustment screw to
adjust the voltmeter so that the meter displays 1.0 VDC when the truck
TACH shows 1000 RPM. The meter should then display 1.5 VDC at 1500
RPM, 2.0 VDC at 2000 RPM, etc.
4. Once you have the RPM set for 1.0 VDC per 1000 RPM turn the engine off
and return the ignition key to the “on” position.
5. Make sure there is power at the EOS-110 (overspeed light should be on).
Place the positive lead into the disengage jack. Using the disengage
adjustment screw adjust the voltmeter so that the display shows your
desired disengagement speed based on the relationship that 1.0 VDC =
1000 RPM. (Example: a disengage speed of 1800 RPM will show 1.8 VDC
on your voltmeter.)
6. Place the positive lead into the engage jack. Using the engage adjust-
ment screw adjust the voltmeter so that the display shows your desired
re-engagement speed based on the relationship that 1.0 VDC = 1000
RPM. It is recommended that the engage be set at 1000 RPM. The engine
must idle at a speed below the engage setting in order for the unit to
function properly.
NOTE: The DISENGAGE is to be set first, then the ENGAGE. Also, when the
engine is running the ENGAGE test jack will show 6 VDC or 6000
RPM when the EOS-110 has engaged the PTO or pump. This con-
dition is normal and no damage occurs during this condition.
7. The EOS is now calibrated. Remove the voltmeter and test the EOS with
engine running. Repeat steps 3-6 if needed.