C9, TM 9-2350-230-12
TABLE 5-8.1. CLEANING AND LUBRICATION OF GUN LAUNCHER (REFER TO FIG. 5-10.2)
DAILY CLEANING AND LUBRICATION (AT COMPLETION OF DAYS FIRING SCHEDULE)
2. Using a soft rag, wipe residue, dirt, and foreign material from obturator seal, rear face of gun tube, seal cavity,
breech chamber front face, coupling and breech chamber buttress threads, and all exposed surfaces. DO
NOT USE STEEL WOOL.
3. Visually inspect all areas for cleanliness and reinstall obturator seal.
4. Apply coating of lubricating oil(PL-S) to all cleaned areas. Spread evenly with a clean saturated rag or brush.
Blow out detent cavity with dry compressed air. Make sure that coupling and breech chamber buttress
threads are well lubricated.
5. Hand crank breech chamber open and closed several times to check for smooth and normal operation. Leave
breech backed out but not rolled over to permit air circulation and reduce condensation. Return hand crank
to an approximate 12:00 o'clock lockout position.
6. Before firing, wipe dry all areas except coupling and breech chamber buttress threads. Maintain lubricant on these
threads at all times.
7. Clean gun/launcher tube with RBC (M81 tube - also clean evacuator valves and chamber, Fig. 5-10).
8. Notify organizational maintenance to service detent as necessary after days firing but not to exceed 40 rounds.
Additional checking and cleaning is recommended if a prolonged period between firing missions exists.
NOTE. After firing 200 rounds, notify organizational maintenance to remove firing probe and inspect probe
and breech chamber for erosion (Table 5-1).
9. (M81E1 and M81 Modified) Notify organizational maintenance to service check valve at least every 100 rounds.
More frequent cleaning is recommended if carbon buildup or decrease in CBS air volume is suspected,
CLEANING AND LUBRICATION AT COMPLETION OF FIRING MISSION AND WHEN WEAPON WILL NOT BE USED
FOR EXTENDED PERIODS
1. Immediately after firing and on next two following days thereafter, open breech, remove obturator seal, and
thoroughly clean bore and breech chamber with RBC, (MIL-C-372) insuring that all powder-contacting
surfaces (including rifling) are well coated. Do not wipe dry.
2. On third day after firing, clean bore with RBC, using RBC and a non-scratch pad or stiff bristle brush, wash
obturator seal, breech chamber, front face and exposed surfaces, gun tube rear surface and seal cavity, and
coupling threaded area. DO NOT USE STEEL WOOL..
(M81 only) On third day after firing or monthly if cannon is not being fired, remove evacuator and valves (Fig.
5-10). Clean all powder contacting surfaces with RBC. Wipe dry and apply a
thin coating of
PL-S. Apply GG
at temperatures above 0F and GAA below 0F to threaded portions of evacuator and thrust collar before
assembling.
5-24.1