ARM GP-TOW 7R0330 - Caterpillar

Ensure that you wear eye protection at all times during testing. When fuel injection nozzles are tested, test fluids travel through the orifices of the nozzle tip with high pressure. Under this amount of pressure, the test fluid can pierce the skin and cause serious injury to the operator. Always keep the tip of the fuel injection nozzle pointed away from the operator and into the fuel collector and extension.
Illustration 2 g00804566
5P-4150 Nozzle Testing Group (1) 5P-7448 Adapter (2) Fuel injection nozzle (3) 6V-2170 Tube assembly (4) 1U-8857 Extension (5) 8S-2270 Fuel collector (6) 8T-5313 Filter
Do not use dirty test fluids when you test fuel injection nozzles. Also, do not test fuel injection nozzles unless you have the correct service tools.The use of dirty test fluids and the use of incorrect service tools will result in damage to fuel injection nozzles.
Connect fuel injection nozzle (2) to the tooling that is shown in Illustration 2.Position the fuel injection nozzle so that the fuel spray is directed into the 1U-8857 Extension (4) and the 8S-2270 Fuel Collector (5) .Use clean 6V-6068 Calibration Fluid when the fuel injection nozzles are tested. The calibration fluid is equivalent to SAE J-967 (ISO 4113) oil.
Close the gauge protector valve. Close the shutoff valve. Open the pump isolator valve. In order to flush the fuel injection nozzle, operate the nozzle tester for 10 to 15 strokes at a rate of approximately 60 strokes per minute.
Open the gauge protector valve. Slowly increase the pressure until the valve in the fuel injection nozzle opens. Note the highest pressure indication on the dial indicator before the pointer moves to 0 kPa (0 psi). This highest pressure indication is the opening pressure of the fuel injection nozzle. The opening pressure is defined when the valve needle is lifted from the valve seat.
Refer to Specifications, "Fuel Injection Nozzles" for the correct pressure settings.If the opening pressure is not within the range of the setting that is given, the fuel injection nozzle must be replaced.Back Leakage Test
Connect fuel injection nozzle (2) to the tooling that is shown in Illustration 2.Position the fuel injection nozzle so that the fuel spray is directed into the 1U-8857 Extension (4) and the 8S-2270 Fuel Collector (5) .
Pump the pressure to about 1030 kPa (150 psi) below the opening pressure of the fuel injection nozzle.Refer to Specifications, "Fuel Injection Nozzles" for the correct setting of the opening pressure.Release the handle. When the pressure begins to decrease, note the time that is required for the pressure to decrease to approximately 0 kPa (0 psi). If the fuel injection nozzle is not faulty, the time will not be less than 5 seconds or more than 45 seconds.
When the test in Step 2 is done, look for any leakage from the pressure faces of the holder and the retaining nut of the fuel injection nozzle. If leaks are visible, make sure that the components are tightened to the correct torque. Do