(Make Sure Revolver is Unloaded!)
1. Open the gate and rotate the cylinder a few times to be certain the revolver is unloaded. Leave the gate open.
2. Press in fully on the left side of the base pin latch, and while holding it in that position, withdraw the base pin. Remove the cylinder and close the gate. This is as far as you need to go for routine cleaning.
2. Draw hammer rearward to full cock position. Insert a short length (about D of nail or pin into the small hole at the lower end of the hammer strut (The purpose of the pin is to confine the mainspring when the hammer is released.)
3. While maintaining thumb pressure on the hammer spur, squeeze the trigger and ease hammer down to full forward position.
4. Remove the five screws which fasten the grip frame to the cylinder frame.
5. Pull the grip frame rearward and downward to separate it from the cylinder frame. (If the grip frame does not readily separate from the cylinder frame, draw the hammer rearward a short distance.) Remove the mainspring assembly from the grip frame, hut do not remove the small pin that is confining the mainspring. The mainspring assembly will later be reassembled into the frame as it is.
Do not 'lose' the pawl spring and plunger (located in a hole in the rear of the left side of the cylinder frame, just above the grip frame screw hole) or the cylinder latch spring and plunger (located in the hole above front of the trigger guard bow in the grip frame).
6. Remove the trigger pivot (pin) as follows: using a screwdriver as shown in Figure 1, p. 16, depress the gate detent spring so that the end of the spring which rests in one groove of the trigger pivot is free of the groove. Then, use a drift and hammer to push the pivot completely out of the frame.
ACAl.TION: Press the screwdriver blade tip against the spring carefully and he certain the blade does not slip off the spring and damage the frame or injure the person holding the gun.
7. Remove cylinder latch, gate detent spring, and gate.
8. Remove hammer pivot. Then remove the hammer/pawl assembly and the trigger/transfer bar assembly. (Note that the hammer is attached to the pawl and the transfer bar is attached to the trigger. See Figure 2).
ALTHOUGH THE FOREGOING OUTLINES THE CORRECT PROCEDURE, WE WISH TO EMPHASIZE THAT SUCH DETAILED DISMANTLING IS SELDOM IF EVER NECESSARY.
The revolver is, at this stage, disassembled as far as it needs to be for major cleaning and maintenance. However, if it is necessary to go beyond the above steps, the following cautions and suggestions should be useful:
Ejector/Ejector Housing: Wrap one hand firmly around barrel and housing when loosening the screw. Remove screw, then carefully lift housing (which contains compressed spring and ejector rod) away from the barrel.
Base Pin Latch/Nut and Spring: The nut must be held firmly (with jaw-protected pliers) while the latch is being unscrewed. Don't lose the spring. When reassembling, be certain the nut and spring are on the left side of the frame. (See Parts Drawing).
Rear Sight: The rear sight can be removed from the frame by drifting out the pivot pin (MR05600) and removing the elevation screw (MR05902). Unless it is essential, the rear sight should not be removed because there is the risk of losing the very small elevation springs. If the sight is removed, when reassembling it is helpful to put a very tiny dab of lubricating gun grease in the recesses of the sight base. The grease will hold1 the springs upright when the sight is positioned on the frame as the rear sight pivot pin is being reinstalled.
1. Assemble pawl to hammer and transfer bar to trigger as showTi in Figure 2. Partially insert hammer/pawl assembly in its recess in the frame. Insert trigger/transfer bar assembly in its slot in the frame. Then simultaneously complete insertion of the two assemblies into the frame.
2. (Refer to Figure 1 ). Align hammer in frame and insert hammer pivot with the grooved end of the pivot on the gate side of the frame. (The long screw. XR01901, when also inserted on the gate side, will intersect the groove and lock the pivot in place. See step number 11. p. 18).
3. Replace cylinder latch and gate detent spring as shown in Figure 3. Note that the lug on the cylinder latch fits between the arms of the gate detent spring and that the end of one of the arms of the spring is formed at a 90 degree angle. The projection thus formed, is designed to fit through the square hole in the bottom of the frame and to ride on the cam surface of the gate pivot. Note also that this projection holds the loading gate back and in place.
4. (Refer to Figure 1, p. 16). Depress the upper arm of the gate detent spring with tip of screwdriver blade and install trigger pivot. Pivot should be inserted from the gate side of the frame. The non-grooved end of the pivot should be inserted first. (It may be necessary to manipulate the trigger, the gate detent spring, and the cylinder latch to align them to receive the trigger pivot).
5. Insert the base pin, taking care to be certain the "dished out' section of the base pin collar is adjacent to the bottom of the barrel. The base pin must be fully inserted and locked in position by the base pin latch. If the base pin is not fully inserted and locked\ the transfer bar may catch under the firing pin when the hammer is being cocked\
6. (Refer to Figure 4. p. 18). Unhook the ends of the trigger spring (XR03700) from the grooved retaining pin on both sides of the grip frame.
7. Insert cylinder latch spring and plunger in hole in grip frame. (The spring goes in first so that the plunger is on top).
8. Insert pawl spring and plunger (plunger goes in the hole first) in the hole in the left side of the cylinder frame just above the left rear grip screw hole.
9. Install mainspring assembly in the grip frame. Be certain the strut is positioned properly. See the Parts Drawing for correct strut positioning.
10. (Refer to Figure 4. p. 18). Draw hammer to the rear slightly and place the grip frame loosely on the cylinder frame. Before pushing the grip frame forward to mate with the cylinder frame, be certain that;
(a) the cylinder latch plunger (XR07700) is positioned so that is will contact the bottom of the cylinder latch (rather than either side of the latch),
(b) the pawl spring is aligned to contact the left 'ear' of the grip frame (and not be bent as the ear contacts it).
11. See Figure 4, and note the end of the trigger spring (the arrow marked ,4A*). This end of the spring must be depressed so that it slides under the rear portion of the trigger when the grip frame is forward. With all the above springs and plungers aligned, fully mate the grip frame and cylinder frame and install the five grip frame screws. Note that the long screw (XR01901) should go in the grip frame hole on the gate side (Figure 4-B) of the revolver.
12. Hook the two ends of the trigger spring over the pin (KXR06300) as shown in Figure 4-C.
14. Open the gate, withdraw base pin and install the cylinder. Reinsert the base pin and be certain it is fully seated and locked in position.
13. Be certain the mainspring strut seat is correctly positioned on its step in the grip frame. Then, draw the hammer back to the full cock position and remove the small pin from the mainspring strut. Pull trigger and allow hammer to fall.
15. Before loading cartridges into the chamber, cycle the revolver several times. Check to be sure that cylinder rotates and locks correctly, that trigger returns in a positive manner when released, and that loading gate opens and closes normally.
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