LUG 5G6978 - Caterpillar

Installation Procedure
1. Cut tubes for the nozzle adapters as follows: A. Cut exactly 59 mm (2.3") from the short end of a 5P4721 Tube. Use this tube for the 5P8744 Adapter Assembly. The length cut from the tube for this adapter is important because the volume of fluid in the tester is the basis for the "Pressure Loss Test" of capsule-type fuel nozzles. The volume of test fluid in the new fitting is the same as the volume in the length of tube removed. The lengths cut from the tubes that follow for the other adapters are less important, and can be approximate.B. Cut approximately 75 mm (3.0") from the short ends of three 5P4721 Tubes and one 6V2171 Tube Assembly.C. Cut approximately 75 mm (3.0") from the long end of one 6V2170 Tube Assembly.
Illustration 1. Assembly of parts for improved optional modification.2. Remove all burrs from the cut ends and thoroughly clean the tubes.3. Install a 5P4719 Fitting Assembly and 6V3989 Nipple on the cut end of each tube. See Illustration 1. Also, see the topic "Replacement of 5P4721 Tube" in Special Instruction Form SEHS7292.4. On the opposite end of each tube, use a 3J1905 Sleeve and 3J1906 Nut (also parts of 5P4719 and/or 5P4720 Fitting) to install each adapter as shown in Illustration 1.5. Remove the original tube assembly and 5P4719 Fitting from the tester.6. Install a 5P3238 Nipple and 6V4143 Coupler Assembly. See Illustration 2.
Illustration 2. New nipple and coupler assembly installed in tester.7. To test 9L8965 Nozzles (for early 1100 Series Engines), install a 6V4142 Nipple and 9S7341 Fitting on an 8S2268 Tube Assembly with no modification. See Illustration 3.
Illustration 3. Assembly of parts to test 9L8965 Nozzles.8. Illustration 4 shows the correct position of the tube and nozzle to make the test.
Illustration 4. Correct position of tube and nozzle for test.