TM5-4930-230-13b. Disassembly.(1)(2)lever (9).(3)Remove and disassemble wingnuts (2), Iockwashers (3), hooks (4), hook bolts (5), and gasket (6).Disassemble latch assembly by removing hinge bolts and nuts (7) closing cam (8), and lockingRemove nut (10), washer (11), bolt (12), washer (13), two washers (14), and spacer (15) andremove closing cam (8). Remove Fuse Plug, gasket and nut (16). Remove Vent Assembly (17). Removemetal gasket retainer (18) and rubber gasket (19).c. Cleaning and Inspection.WARNINGDrycleaning solvent, P-D.680, used to clean parts is potentially dangerousto personnel and property. Avoid repeated and prolonged skin contact. Donot use near open flame or excessive heat. Flash point of solvent is 100degrees F -138 degrees F (38 degrees C-59 degrees C).(1) Clean parts with dry cleaning solvent (item 1, Appendix E) and dry thoroughly.(2) Inspect parts for breaks, cracks, damaged threads, and other defects.(3) Inspect gasket.(4) Replace defective parts.d. Installation.(1) Position cover gasket (6), and install manhole cover (1) on tank,(2) Space hook assemblies around inner perimeter of manhole cover and tighten wingnuts (2).(3) Lower hinge (8) over cover and lock with release cam (9).The manhole cover assembly (figure 4-16) is provided with a vent assembly located in the cover whichvents at approximately 0.5 psi (0.0352 kg/sq cm) of internal pressure. It is also equipped with fuse plugwhich will melt at 170 degrees F to 190 degrees F (77 degrees C to 88 degrees C).4-36
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