TANK A.-FUEL 3H7914 - Caterpillar

Ensure that the gas supply to the propane gas pressure regulator is turned off.
Illustration 3 g03606576
(1) Low-pressure side port (2) High-pressure side port
Connect 1U-5470 Engine Pressure Gp or 198-4240 Digital Pressure Indicator Gp to the engine.
Connect the "Low Pressure Side " of the gauge to the port at the outlet of the propane regulator. The port should be upstream of the electronic fuel control valve and the propane emission adjustment screw as shown in Illustration 3.
Connect the "High Pressure Side " of the gauge to the tee fitting by the balance line on the propane regulator as shown in Illustration 3.
Install the 8T-5160 Gas Regulator Setting Tool if necessary.
Turn the gas supply pressure back on. Start the engine and operate at rated speed and no load.
Note the pressure differential reading. The reading should be in the range of 1.5-3.0 inches in H2O.
If the values match proceed to Step 9.
If the values do not match while using the 8T-5160 Gas Regulator Setting Tool , proceed to Step 6. If the values do not match while not using the 8T-5160 Gas Regulator Setting Tool , proceed to Step 7.
Use the 8T-5160 Gas Regulator Setting Tool to adjust the regulator spring pre-tension until the measured and calculated differential pressures match. Once the pressures match, proceed to Step 9.
Shut down the engine and turn off the gas supply pressure.
Remove the cap from the engine mounted gas pressure regulator.
Adjust the regulator with the nut/screw with a screwdriver or similar tool.
Replace the cap.
Turn on the gas supply pressure. Start the engine and operate at rated speed with no load.
Check the measured differential pressure. If the reading is between 1.5-3.0 inches H2O, proceed to Step 9. If the measured differential pressure is not within the range, repeat Step 7 to Step 8. Repeat these steps until the measured and calculated differential pressures match.
Replace the cap.
Stop the engine and turn the gas supply to the regulator off.
Remove the lines for the differential pressure gauge and install the plugs into the low and high-pressure ports.
Turn on the gas supply pressure and restart the engine.Set up for Automatic Switching Between Natural Gas/Field Gas and Propane
Note: The switchable dual fuel timing feature can only be used if the secondary fuel is propane. This system does not support any other type of fuel as the secondary fuel. Caterpillar does not guarantee the engine performance or emission compliance, if a fuel other than propane is used.
Illustration 4 g03605476
(1) Point A (2) Balance lines kept separate (3) Natural gas emission Adjustment screw (4) Balance line 1/2 inch diameter (5) Propane gas emission adjustment screw (6) Propane gas regulator (7) Solenoid valve (8) Vaporized propane gas (High BTU gas) (9) 1.5-3.0 in H2O negative differential from here to Point A (10) 5.5 inch 5 inch H2O differential here to Point A (11) Check valve (12) Manual shutoff valve or solenoid valve and pressure switch (13) Natural gas (Low BTU gas) (14) Pressure switch (15) Natural gas regulator (16) Fuel actuator (17) CarburetorNote: Callouts (7)