ASSEMBLY INSTRUCTIONS

8. Before assembling components to make up a complete depth charge, check each part to see that it bears a depot inspection tag or stencil. This marking insures that the parti-cular component was in proper working order when shipped.

INSTALLATION OF BOOTSER AND BOOSTER EXTENDER

9. Install a booster and booster-extender in a depth charge case as follows:

(a) Engage the socket on the booster can with the collar on the booster-extender. Place the booster and booster-extender in the central tube of the depth charge case, with a rubber gasket, in good condition, between the booster-extender flange and the flange on the central tube.

(b) Place cap screws with lock washers in the flange and tighten the screws gradually, one by one, until all are uniformly tight. If the screws are not all thightened equally, the booster-extender may be slightly cocked in the central tube. This condition may cause faulty operation of the mechanism, or may allow water to leak into the central tube of the depth charge.

10. TEST the booster-extender as follows:

(a) Remove the safety fork (Hooking the extender testing tool into the eye of the fork is a convenient means of doing this). When the fork is removed the spindle should move inward about ¼ inch due to the spring tension in the bellows. Only on rare occasions will the Mark 6 booster extender fail to do this. Howe-ver, since the spindle of the Mark 6 Mod. 1 booster extender passes through a seal in the spindle bushing, the spindle will sometimes fail to move inward due to tighness of the seal. If the spindle does not move inward, the packing gland should be backed off to free the spindle. Approximately ¼ turn should be sufficient to accomplish this purpose. In this connection it should be noted that the sufficient to accomplish this purpose. In this connection it should be noted that the function of the gland seal is to prevent moisture entering the booser extender hydrostatic chamber when the safety fork is in place on the spindle. Excessive slackening of the packing gland will permit water to leak along the spindle into the hydrostatic chamber, causing corrosion and, at times freezing of internal operating parts.

(b) Engage the hook of the testing tool in the hole at the end of the spindle and pull outward. Hold the spindle in this position and swing the body of the tool until the recessed end engages in the groove in the spindle. Release the tension on the tool. The booster spindle will be retracted by the tension in the bel-lows and the body of the tool will be pulled into the hole in the spindle bushing. The hook will now be free; swing it outward to clear the flange. Before releasing the tension on the tool be sure that it is well centered on the spindle so that the seal on the Mark 6 Mod. 1 booster will not be gouged with the edge of the tool as it is pulled into the hole.

(c) Test the booster for freedom of motion by pushing the spin-le inward about ¾ inch, ONLY.

(d) The spindle has a certain natural resistance to motion due to the reaction of the spring and friction of the locking balls. If there is binding or restistance in excess of this natural resistan-ce and the cause cannot readily be found and corrected by ex-amination of the booster can, central tube or exterior of exten-der mechanism, return the extender mechanism to a depot or tender for overhaul.

(e) To release the tool from the booster spindle, swing the hook into the hole at the end of the spindle. Pull outward on the hook and disengage the body of the tool from the groove. Swin the body of the tool outward and away from the spindle and replace the safety fork. Remove the hook.

INSTALLATION OF DETONATOR

11. To install a detonator in a pistol and to install the pistol in the case, proceed as fol-lows:

(a) Remove the safety cover and inspect the ports of the inlet valve (Mark 6 pistol) or the orifice of the deep firing mechanism (Mark 6 Mod. 1 pistol). Set the deep firing poin-ter at 0 - 300. Replace the safety cover.

(b) Set the index pointer to SAFE with the depth setting wrench. (Check to see that the pisol is cocked. Then rotate the index pointer counterclockwise from "Safe" to "30" and clockwise from "30" to "Safe" with the depth setting wrench. An imporperly assembled depth setting sleeve or a sheared index pointer stop pin can thus be discovered before the detonator is attached to the pistol and before the pistol is installed in the depth charge.)

(c) Release the detonator holder locking spring and remove the detonator holder with de-tonator holder wrench.

(d) Place the detonator in the detonator collar. Lower the deto-nator holder over the detonator and with the detonator holder wrench screw it in place. Replace the detonator holder locking spring. See that the end of this spring projects inside of the guide tube to prevent the detonator holder from backing out.

CAUTION: CAUTION: THE OPERATION OF ATTACHING THE DETONATOR TO THE PISTOL SHOULD BE PERFORMED WITH EXTREME CARE.

(e) Place a rubber gasket on the central tube flange of the depth charge case or slip the gasket over the centering flange of the pistol and hold it against the pistol carrying flan-ge. Then insert the pistol in the case.

(f) Put securing cap screws and lock washers in place. Locate the safety stop to depth setting wrench by placing its attaching cap screws in the pistol carrying flange holes ad-jacent to the "150" and "250" dial marks. Note that the safety stop is provided with a marking on the top of the projecting mid-section to indicate its releationship to the cen-ter of the pistol. Set up the cap screws until all are uniformly tight.

(g) Make up the safe setting lock by reaving a piece of No. 19 (".0358 dia.) copper wire through the holes in the solid lug of the index pointer and the holes in the wrence safety stop. Use the long nose pliers and a piece of wire approximately 6 inches long for this purpose. Both of these items are included in the service tool set. If the depth charge is intended for immediate use the safe setting lock may be omitted at the discretion of the responsible officer.