HOSE 3R5019 - Caterpillar

Use only properly designated Caterpillar gas pressure regulators.
The gas pressure regulator requires adjustment during the following conditions:
Engine installation
Reworking of the regulator
Change in the BTU content of the fuelIn order to adjust the gas pressure regulator correctly, the 1U-5470 Engine Pressure Group must be used. This pressure group will measure the air/fuel differential pressure.Perform the adjustments on the gas pressure regulator as the adjustments are outlined in this section. The difference in pressure for G3408 Engines and G3412 Engines with high pressure systems and with low pressure systems is equal. The difference in pressure should be equal to the following amount.Difference in pressure ... 1 to 1.2 kPa (4 to 5 inch of H2O) Engines that use negative pressure regulators should be set to -0.25 kPa (-1.00 inch of H2O).Adjustment For Gas Regulators With Known BTU Content Of The Fuel
The following tools will be needed in order to perform these adjustments:
8T-5160 Gas Regulator Setting Tool
1U-5470 Engine Pressure Group
Illustration 10 g00580080
Pressure Measurement (1) Carburetor. (2) Plug. (3) Location for the tee for the pressure tap. (4) Cap over the adjustment screw.
Illustration 11 g00580088
Pressure Measurement On Dual Fuel Engines (1) Carburetor. (2) Plug. (3) Plug. (4) Cap over the adjustment screw. (5) Cap over the adjustment screw. (6) Plug on the balance line. (7) Location for the tee for the pressure tap.
Make sure that the main valve is shut off.Note: If the BTU content is not known in a pressure regulator, disregard steps 2, 3, 4, 10, 11, and 12.
Remove the plug from the gas line at location (2) .
For pressure regulators, remove the elbow at point (2) and replace the elbow with a tee. Remove plug (6) on regulators that measure vacuum.
Connect the 1U-5470 Engine Pressure Group and the shutoff valve. This can display the pressure differential on the pressure regulators. This connection should be made between location (2) and location (4). Use locations (3) and (6) for pressure regulators to measure a vacuum.
Remove the cap (5) for the pressure regulators. Remove the cap (7) for the pressure regulators that measure vacuum. If a locknut is present, loosen the locknut. Install the correct tools from the 8T-5160 Gas Regulator Setting Tool. On regulators that measure vacuum, the screw should be adjusted to a different position. This screw should be adjusted to the halfway point.
Open the main gas valve. Start the engine and run the engine at high idle.
Adjust the regulator. Turn the screw for the positive regulator in the clockwise direction. This will cause the amount of output on the fuel pressure regulator to increase. On negative regulators, turning the nut inward will decrease the amount of output. This will reduce the vacuum.
Shut off the engine.
Remove the 8T-5160 Gas Regulator Setting Tool from the regulator. Install the cap (5) or the cap (7) .
Remove the 1U-5470 Engine Pressure Group from the engine.
Install plug (2) and install plug (3).
For pressure regulators, install a cap or a plug at location (4) and (5). The elbow that was removed earlier at this location will not