=Cannoneer Dismountings.= A. Breechblock. 1. Safety piece. 2. Striker. 3. Lanyard. 4. Striker hammer. 5. Hammer spindle. 6. Spring assembling pin. 7. Rack springs. 8. Rack. 9. Latch pin. (Pawl Pin.) 10. Latch (Pawl). 11. Latch spring. (Pawl spring.) B. Extractor. 1. Clow. (Tang.) 2. Spindle. 3. Arms. C. Level. D. Sight case. E. Wheels. F. Limber pole. G. Fuze setter from caisson. H. Luggage frame from limber. =Mechanic Dismountings.= A. Coupling keg. B. Push gun back on slides. C. Safety bolt. D. Friction piece. (Sweeper plate.) E. Wiper. (Guide piece.) F. Front plug. G. Filling hole plug. H. Elevating screw pin. I. Elevating screw. J. Trunnion caps. K. Rocker Trunnion caps. (Half Rings.) =Daily Cleaning and Lubricating.= (By cannoneers.) 1. Clean sight support and socket. 2. Lubricate oil holes 20, 21, 22, 23, 24. 3. Clean base of sight column. 4. Clean levels. 5. Lubricate range mechanism. (Holes Nos. 1 and 2.) 6. Clean and oil rocker trunnion caps. 7. Oil holes 7 and 8. 8. Clean and grease exposed parts of axle. 9. Dismount and clean breech and all its parts. 10. Clean and grease the bore if the gun has been fired. 11. Clean and grease the slides if the gun has been fired. 12. Grease the wheels if the gun has been on the road. 13. Clean fuze setter. 14. The life of a gun depends on “Daily Care.” =Forbidden Practices.= 1. =Readjustment of French Sights=. 2. =Fitting with files=. 3. =Forging and Riveting=. 4. =Unauthorized Dismountings=. Care of Recoil Mechanism. (_Chief Mechanic Only_) =Caution.=—Never remove piston rod nut, as piston is under pressure and would pull piston rod into cylinder. The recoil apparatus proper cannot be dismounted. If properly taken care of the recoil mechanism will not go wrong for years; but if neglected, its destruction is only a matter of very little firing. The position of the gauge finger is the index as to whether or not the recoil is being properly absorbed. The joints are not absolutely tight, the slight leakage which takes place during fire or even when gun is at rest is not important. In normal firing conditions the recoil apparatus contains a slightly greater quantity of oil than absolutely necessary; this quantity is called the “reserve.” When the reserve is exhausted any loss is liable to reduce the quantity strictly necessary. The loss may prevent the gun from fully returning to battery when firing. The amount of reserve is indicated by the position of the gauge. No reserve: The gauge finger is down deep in its recess. Full reserve: The end of the gauge finger is level with the gauge index. Excess reserve: The gauge finger projects beyond the index. _No firing should be done with an excess reserve._