Figure 3-3. Shutter Maintenance

TM 5-6635-386-12&P Figure 3-3. Shutter Maintenance NOTE Two 6-32 fasteners simplify plate removal. It will require occasional cleaning due to dirt buildup within the shutter chamber. Set the tester on its side or tail with the source in safe position. Stand behind the tester, peek over bottom of tester to see cleanout plate. Remove the 1/4 turn fasteners holding the cleanout plate in position. Remove the plate and the captive shutter. The shutter and cleanout plate are an integral assembly. Do not touch the brass ring around the hole in the plate. Clean the shutter and the plate thoroughly, and clean out the shutter chamber with a brush (standing behind the tester while this is done). It is not necessary to extend the source to clean the end of the rod! Leave it alone! Spray the shutter, cleanout plate, and the interior of the chamber with molybdenum-disulphide lubricant (Appendix E, Item 2). This lubricant should then be allowed to dry for a period of four hours or more to cure to the metal. This will provide a long life lubrication of the shutter for maximum utility between cleanings. NOTE Do not force the source rod handle when the shutter is dirty. CPN does not recommend the use of oil or grease for lubrication, however, several customers have reported good performance by spraying WD-40 (Appendix E, Item 3) into the shutter chamber without disassembling it. The use of WD-40 will not injure the tester or affect test results. If it works for you, use it. 3-7. SHIPPING CASE MAINTENANCE The shipping case is a fiberglass case built to MIL Spec standards. It is very strong and will produce excellent service. No special care is required on the case other than an occasional cleaning (both inside and out) with soap and water. 3-8. TESTER EXTERIOR MAINTENANCE Wash the tester with soap and water if it becomes unusually dirty. WARNING Drycleaning solent PD-680 is toxic and flammable. Wear protective goggles and gloves and use only in a well ventilated area. Avoid contact with skin, eyes, and clothes, and don’t breathe vapors Do not use near open flame or excessive heat. The flash point for Type #1 Drycleaning Solvent is 1000F (380C) and for Type #2 is 1380F (500C) If you become dizzy while using cleaning solvent, get fresh air immediately and get medical aid If contact with eyes is made, flush your eyes with water and get medical aid immediately. Remove asphalt with PD-680. Do not scratch display window with abrasive cleaners. 3-3