TM-9-2320-280-20 HMMWV Technical Manual Unit Maintenance Volume 3 Download
Page 507 of 1170
TM 9-2320-280-20-3 I 11-166. NBC AIR LINE PIPING MAINTENANCE This task covers: a. Removal c. Installation b. Air Line Piping Fabrication INITIAL SETUP: Applicable Models Materials/Parts M996, M996A1, M997, M997A1, M997A2 Adhesive (Appendix C, Item 6) Tools Manual References General mechanic’s tool kit: TM 9-2320-280-10 automotive (Appendix B, Item 1) TM 9-2320-280-24P NOTE ● Replacement and repair for NBC air lines in M996, M996A1, M997, M997A1, and M997A2 ambulances are basically the same. This procedure gives general guidelines for repair or replacement of PVC pipe. c The PVC pipe used in ambulance NBC air lines is made up of tees, elbows, connecters, and miscellaneous lengths of straight pipe. All of these are connected and sealed with PVC adhesive. Before beginning a repair or replacement procedure, ensure that you have all necessary pipe, connectors, and PVC adhesive. Remove section of damaged pipe (6). Damaged pipe section (6) will have to be cut from system because pipe joints cannot be separated without damaging components. b. Air Line Piping Fabrication 1. 2. 3. 4. 5. 6. Cut a section of new pipe (2) 1/16 in. (1.6 mm) smaller than damaged pipe section (6). NOTE Perform steps 2 and 3 before applying PVC adhesive. Install two connectors (3) on new pipe section (2). Install connectors (3) and new pipe section (2) on pipe ends (4) to ensure correct fit and then remove connectors (3) and new pipe section (2). NOTE Clean ends of pipe with emery cloth before applying adhesive. Apply PVC adhesive to one end of connectors (3) and both ends of new pipe section (2). Install two connectors (3) with PVC adhesive coated ends inward, to new pipe section (2) and twist components 70-90°. If an elbow (1) or tee (5) is being installed, twist components together 70-90° and then turn components to their proper orientation. Allow PVC adhesive to dry. Apply PVC adhesive to connectors (3) and pipe ends (4). c. Installation Install connectors (3) and new pipe section (2) on pipe ends (4) and twist 70-90°. Allow PVC adhesive to dry. 11-244