5-1
TM 10-4930-220-13&P
CHAPTER 5
DIRECT SUPPORT MAINTENANCE INSTRUCTIONS
Section I. DIRECT SUPPORT TROUBLESHOOTING
5-1.
There are no troubleshooting procedures at Direct Support Maintenance Level for the Tank, Unit, 600 Gal-
lon, Liquid Dispensing.
Section II. DIRECT SUPPORT MAINTENANCE PROCEDURES
5-2. General.
a.
This section contains the direct support maintenance procedures as authorized by the Maintenance Al-
location Chart (MAC), Appendix B of this manual.
b. The tank assembly includes the manhole cover assembly, the drain valve and control handle, the emer-
gency dump valve and control lever, and the pump port and holddown assemblies.
c.
The tank and its components must be cleaned before any repair is initiated. Each time a component
is removed for repair, inspection or other service, it must be cleaned thoroughly.
d. No repair will be initiated until the tank has been thoroughly vented and cleaned. The atmosphere inside
the tank must be tested and certified safe by technically qualified personnel prior to welding on the tank.
e.
Before attempting welding repairs on the tank, drill four 1/2 inch diameter drain holes in each skid (eight
holes required) and four 1-1)2 inch holes in each skid (eight holes required). (See Figure 4-1)
f.
Read all warnings, cautions, notes and instructions carefully before operating or working on the tank
assembly.
5-3. Repair Tank Assembly.
This task covers:
a. Repair
INITIAL SETUP
Tools
MSA Vapor Tester (Appendix B, Section III, item 5)
Welder (Appendix B, Section III, item 4)
Tool Kit, Master Mechanic’s (Appendix B, Section III, item 4)
Materials
Rags, Wiping (Appendix E, Section II, item 3)
Compressed air supply and air hose of sufficient length to reach depth of the tank.
A sufficient quantity of gas tank purger solution or a suitable detergent solution
(Trisodium-phosphate, (Appendix E, Section II, item 6) FS-O-T-642D)
(Appendix E, Section II, item 1 ) FS-P-D-790).
