Basic Parts Inspection Guide... Hudson M3A1 "Grease Gun

[cerwyn]

Basic Parts Inspection Guide... Hudson M3A1 "Grease Gun"

***UNDER CONSTRUCTION***PHOTOS TO FOLLOW***



Field Stripping and Cleaning have already been covered in previous Step by Step Guides so this guide begins with your "Grease Gun" already stripped into its component parts.

Re-assembly is explained in a separate Guide


1. Detonator Pin and Chamber.


The metal Detonator Pin can be prone to corrosion damage and occasionally being knocked out of shape by miss fed cartridges.


Light corrosion can be removed with Wire Wool and / or Emery paper (Wet’n’\Dry)

The Chamber is moulded in ABS and will wear out in time. Cartridges entering the Chamber can scuff the surface but the forces exerted against the Detonator Pin can push it through the back of the Chamber.

Check the base of the chamber to ensure the locating hole for the Pin is undamaged.



Check the entrance into the Chamber for damage.



Any rough edges here might interfere with your cartridges feeding into place. Any light nicks and burrs can be carefully smoothed out by a sharp blade or abrasive paper.
Check the inside of the chamber for dirt and deposits. Build up of dirt or gummed up old oil will cause cartridges to stick and jam inside

2. Bolt and Extractor

Bolt condition is vital to the firing performance of your model gun.
Starting at the bolt face, these photos show how each cartridge is held onto the Bolt during the firing cycle.
Note the circular recess in the centre of the face,the Extractor Claw and the two "prongs" formed by the Ejector Groove projecting forwards.







The Bolt strips each round from the magazine as it travels forwards using these two "prongs" to push the cartridge out of the magazine's feed lips.



The round is pushed home into the Detonator Chamber and its’ rim settles in the circular recess in the Bolt Face Centre.
Any wear or chips to the recess edges and one or both prongs can result in cartridges dropping off the bolt prematurely. If any of these areas are damaged the cartridge will more than likely drop off the bolt. Generally this results in rounds firing, but failing to extract and eject cleanly from the chamber and port.


The extractor claw is spring loaded and clips over the cartridge rim to hold it securely.
Check that the Extractor pivots smoothly against spring pressure…





Check the extractor’s claw for dents or chips. Any slight dents can be cleaned up by careful use of a fine file. Aim to get a sharp and even edge to the claw.


3. Bolt Carrier

Check the screws securing the Bolt to the carrier are tight.



Check the Guide Rods are straight and that the Recoil Springs are in good condition. Look out for broken or coil bound springs

Check the Spring Clip and check the End Cap for any damage as these two components are subjected to being struck by the Bolt each time it travels forwards.





4. Trigger and Sear.



The Sear moves down into the Lower Receiver when the trigger is squeezed. Ensure it drops into it’s recess cleanly and that it returns smoothly when the trigger is released. Problems here may lead to the gun firing accidentally and uncontrollably or the bolt refusing to move forward when the trigger is pulled.


Ref:http://www.mp40modelguns.com/forum2/viewtopic.php?t=2344Reassembly Ref:http://www.mp40modelguns.com/forum2/viewtopic.php?t=2343 Basic Strip Down
Ref:http://www.mp40modelguns.com/forum2/viewtopic.php?t=2345 Basic Clean & Lubrication
Ref: http://www.mp40modelguns.com/forum2/viewtopic.php?t=2349 Parts Inspection
Ref:http://www.mp40modelguns.com/forum2/viewtopic.php?t=2293 Cleaning & Prep Cartridges
Ref:http://www.mp40modelguns.com/forum2/viewtopic.php?t=2323 Loading Hudson Cartridges
Ref:http://www.mp40modelguns.com/forum2/viewtopic.php?t=2266 Loading MGC Cartridges
Ref:http://www.mp40modelguns.com/forum2/viewtopic.php?t=2352 Troubleshooting
Ref:http://www.mp40modelguns.com/forum2/viewtopic.php?t=2351Tuning Tips


Cerwyn