Tuning HW30s or R7 Part- II Problem Identification

Ok! Now we are going to understand what needs to be look at. And why it is required to tune.

Lets follow the picture.

Here we are going to remove the cocking arm. There are two pin that needs to be removed in order to remove the required piece. There is another way too. By removing the main screw that holds the barrel with the receiver can be removed too. But this is simple way.

The next pin too has to be removed.

Now you see the cocking arm is removed. Interestingly if you

Closely, the surface of the receiver badly damaged.

Also see the cocking arm link. Bad in shape. That means metal to metal friction was heavy. So we have to reduce the excess material from the link and polish it. Also we have to File-off few micron of material from the receiver and then polish and blue them.

Not bad after bluing.

It is important to deburr carefully the arrow marked areas. While doing that, just keep in mind, while you will enter the seal, it may cut. So you have to remove all that possibly can cut the seal.

Also you see, the receiver is honed. The ID was Phospheted  from factory to avoid rusting. But it will also avoid nicely lube that important for seal.  Don’t worry about the rust. Go ahead and  hone the receiver with 320 girt if you are doing it with low speed. If you are good with hand tool you can go with high speed honing and in that case, 220 grit will do wonderful job. If you don’t have your hand on water soluble lard oil you can use singer oil for honing.

I have made a honing tool something like this. I wrap emery paper around the front part. The slit helps to secure the paper around it.

See how the deburring and honing is done. Some says they do mirror polish. I strongly object that. My suggestion, a fine Matt finishing is needed for an airgun. 

You are done with your receiver.

In next part, will talk about the spring, piston and the seal and of-course Lubricants.



One response

  1. Nice post. I was checking constantly this blog and I am impressed!
    Very useful info specifically the last part 🙂 I care
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    for a very long time. Thank you and best of luck.

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