Metallisation MK 73 - Dismantling the Wire Drive Assembly

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4.6.1 Dismantling the Wire Drive Assembly
Referring to DIAG 8 and Sub Assembly’s A-C:
 Remove the Rear Wire Guide (E2).
 Remove the Gas Head, as in Section 4.4.
 Unscrew the Bear Housing (E1) with a Peg Spanner / C Spanner and withdraw the
Wormshaft.
 Separate the Bearing (C4) from the Bearing Housing (C1), if necessary using an
appropriate tool.
 Unscrew the Cap Retaining Screw (C2) from the end of the Wormshaft and remove the
Bearing Cap (C3), Ball Bearing (C4) and Bevel Gear (C5).
 Examine all parts for wear.
 Undo the 2 Roller Feed Nuts (A1) and remove the Wire Rollers (A2).
 Remove the Dust Excluders (A3), Feed Roll Cover (A4) and Feed Roll Gasket (A5).
 Unscrew the Cover Screw (B1) found on the right hand side of the pistol.
 Screw out the Slotted Head Screw (B2), retain the Threaded Spring Support (B4), Plain
Spring Support (B3) and Springs (B5).
 Slacken the Lock Screw (E3) and withdraw the Wire Feed Lever (E4).
 Remove the Socket Set Screw (E9).
 Remove the Spacer (E7) using one of the Gas Head Fixing Screws as an extractor.
 Remove the Socket Set Screw (E8).
 Extract the Yoke Support (E5) and Bearing (E6) from the Pistol Body.
 Taking the Yoke Assembly (B6), unscrew the Socket Set Screws (B7) securing each
Roller Gear (B8), and slide the Roller Shafts (B9) from the Yoke Assembly (B6).
WHEN & WHY?
The Wire Drive Assembly should only be dismantled when it is absolutely necessary.
For example:
 There is excessive play in Wire Rollers.
 The Wire Rollers cannot be opened.
 The Wire Feed Lever spins through 360°