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Servicing your HW100
This is a collection of great tried & tested tips, tricks and advice from our Service Engineers & Customers. This section will keep growing, so keep an eye on it!
It can be quite daunting the first time you attempt to service the HW100 yourself. Some of the most common mistakes people make are overtightening the gun when putting it back together, using the wrong tools or o-rings/seals or scratching the gun whilst trying to remove old orings. PLEASE be careful - the HW100 is a precision instrument. If you don't have the right tools or the confidence to attempt it yourself, please contact us or your local Gunsmith to do it for you.
Learn More
One of our customers, Martin Healy has made a series of 3 You Tube videos on how to service your HW100. MANY of our customers have found them helpful...
WHY IS MY GUN FIRING ITSELF?
You have most likely smashed the sears. If you have undertaken any work to the gun, ie. replaced the anti tamper, when re-assembling you MUST make sure that the trigger unit is NOT in a cocked state (press the trigger before attaching to the gun). If you fit the trigger section to the gun when it is cocked you WILL smash the trigger sears - usually the middle sear.
How do you know if you have smashed the sears? On cocking the gun, when you push the cocking lever forward, the gun automatically fires itself (this is because the sear adges are smashed and there is nothing for it to "latch" to).
Fill the Air Cylinder From a Dive Bottle or Pump?
Weihrauch recommend that you use "Divers air quality only" to fill your air cylinder - this is because it has a VERY small moisture content - you can only get this quality air from a dive bottle. Most pumps can only guarantee to provide air that is 90% moisture free - even with a dry pack filter attached.
Any time that you fill your cylinder from empty, remove it from the gun to fill with air 150 to 200bar, then screw it back onto your gun. This is so that the exhaust valve gets a good shot of air to create the best seal. You should do this anytime that your air cylinder has completely emptied to avoid leaks…
Oils, Lubricants and Grease
NEVER put WD40 on your gun!
Only special lubricants specifically designed for pcp-air guns should be used. These are sophisticated oils specially formulated for this purpose. Of the hundreds of oils available, only a few have the proper viscosity, lubricity, lack of acids for use in fine quality pcp-air guns. Our workshop recommend Molykote 33M or our own Professional Airgun Lube.
Never oil the connecting threads and valves of your rifle’s air cylinder and always protect the thread and inlet valve with the dust cover cap provided. That goes for the original Weihrauch cylinder AND our Titanium Cylinders.
JSB Pellet Label Explained
On the back of the tin of JSB pellets you will find a sticker with three sets of numbers (JSB Exact Jumbo Cal .22 pictured):
1st Number: 15050017
2nd Number: 1
3rd Number: 5.52
The 1st number is broken down into the following:
- 15 = The number of the pressing die that was used to make the pellets.
- 05 = Production Employee ID.
- 00 = Quality Control Employee ID.
- 17 = Year of production.
When buying pellets, look at the last 2 digits for the year of production - try and get the newest pellets you can - JSB had a "bad batch" in approx 2015 where the domes on the pellets were not as full as they should be and gave very poor results.
The 2nd number (1) is the manufacturing batch number.
The 3rd number is the calibre head size 5.52.
Free Support
We understand that it can be frustrating when your beloved air rifle isn't working as it should - whether you need it for work or for play. We spend a lot of time offering free support - and are happy to do so - but if you want to send us £1 (or whatever, it's entirely up to you) to say "thankyou" we are always most grateful...
