DIFFERENTIAL & BEVEL GEAR GP 6W2570 - Caterpillar

The water manometer or the differential pressure gauge is not required for the Deltec mixer systems with zero pressure regulators.
Turn off the main gas valve.
Remove the air filter service indicator (1) from the air cleaner.
Remove the plug (2) from the gas line.
Connect a 1U-5470 Engine Pressure Group or a water manometer between the two pressure taps with the proper adapter fittings.Emissions Analyzer
Install the emissions analyzer after the three-way catalyst in order to monitor the exhaust emissions. Connect the emissions analyzer in accordance with the manufacturers instructions.Note: Use an emissions analyzer that can measure NO and NO2 separately, CO and O 2. Use the emissions analyzer to adjust the air/fuel ratio control. The accuracy of the emissions analyzer must be within 10 percent of a standard at the desired engine O 2 emissions level.Inlet Manifold Pressure
The inlet manifold pressure is measured below the throttle plate with a pressure gauge. The inlet manifold pressure is used to indicate the engine load.Initial Start-Up Procedure
Ensure that all of these factors are in proper working condition prior to the initial start-up: engine installation, driven equipment, all of the related hardware and electrical connections. Failure to perform the commissioning procedure could result in unsatisfactory operation.Perform the following procedure for the initial start-up and for start-up after major maintenance and/or after repair.Adjusting the Gas Pressure Regulator
Illustration 6 g03331529
(1) Adjusting screw
Turn the adjusting screw (1) in counterclockwise direction until the screw stops. The carburetor is set to full rich.
Set the gas line pressure into the gas regulator to 10 to 35 kPa (1.5 to 5 psi).
Illustration 7 g03331548
(2) Cap
Remove cap (2) from the gas pressure regulator.
While the engine is OFF, adjust the gas pressure regulator using the 8T-5160 Gas Regulator Setting Tool in order to obtain a differential pressure of 1.74 kPa (7 inch of H2O).Note: Turning the disk clockwise will increase the differential pressure. Turning the disk counterclockwise will decrease the differential pressure.Tuning The Air/Fuel Ratio Control (AFRC)
Note: Only applicable to engines with AFRC.
Start the engine
Verify the differential pressure with the engine running. If necessary, readjust the regulator.
Establish communication between Cat ET and the ECM.
Access the "Configuration" tab.
Set the emissions feedback to "Feedback Disable" in order to operate in the open loop mode.Note: Do not run the engine in open loop mode unattended.
Once the engine is at operating temperature, load the engine to 100 percent.Note: The three-way catalyst outlet temperature should be greater than the catalyst inlet temperature prior to tuning the engine emissions. An outlet temperature value that is greater than the inlet value indicates the catalyst has reached effective operating temperature.
Allow the engine to stabilize
Observe the values shown on the emissions analyzer.
Use Cat ET to adjust the "Emissions Feedback Disable Fuel Actuator Position Command".
Adjust the percentage of the fuel valve position in small increments.
Allow the emissions to stabilize before monitoring.Adjusting the position of the actuator affects the exhaust emissions by allowing more or less fuel for combustion.Engine operation is sensitive to changes to the air/fuel ratio. Allow a few minutes after each adjustment