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Weihrauch HW100 Regulator Stripdown by NightHawk


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#1 TheNightHawk®

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Posted 17 November 2009 - 12:21 PM

After several thousand shots and 2 years of service, my regulator started to stick and spread the velocity. So i decided to stripdown my regulator and renew all o rings. i searched google but i did not find a topic for regulator stripdown and service. i did take some pictures for all weihrauch hw100 owners which like to DIY.

i start with my scope, after marking it's position i removed my scope.

After removing the scope, i removed cylinder for my safety.



You have to turn over the rifle and remove 2 stock screws.





To take the barrel, you have to remove this grubscrew , but mark the barrel position.



When you removed the barrel you are ready to remove the trigger group. it is held by 2 screws. Be sure the rifle is not cocked. Decock if necessary (open the cocking lever, fully press trigger, slowly close cocking lever while the trigger is pressed)



Now you can remove 2 long bolts to remove the pneumatic part.



Now we have to remove 2 bolts to open the firing valve assembly.



You can clean these parts with a paper towel.





if you wish you can polish the valve cap. i used metylan metal polish for mirror finish.



Now we mark the regulator cap to find easly the position after. i suggest you to write down the number of turns you have to turn to remove the cap.



Under the action we have a grubscrew, we have to take it but beware there is a tiny ball inside, take it and put it in a secure place, do not loose!



we can now open the regulator cap and remove regulator valve and washer springs. Pay attension to the number and positions of the springs. Clean all parts and inside of the block.



After the cleaning and relubing with silicone based greases like Molycote 33

Molycote 33 Datasheet

O ring sizes required. All sizes are metric !!!

2.57x1.78 for cylinder.



7x1.50 for Regulator assembly



8x1.50 for regulator cap



11x1.50 for firing valve cap

inside this cap there is a pellet probe o ring which is

5.5x1 for 5.5 (.22) rifle.



8x1.50 Barrel face O ring



I Use Loctite 248 for barrel grubscrew. it is recommended for accuracy and loose barrel problems.



Loctite 248 Datasheet



Assembly is in reverse order, but be gentle on o rings. Have a good day.

My FAC regulator has 16 springs in this order

(())(())(())(())

NightHawk from Turkey.

#2 TheNightHawk®

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Posted 17 November 2009 - 12:54 PM

You may need HW100 Parts Diagram




#3 fenman

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Posted 17 November 2009 - 01:26 PM

Top man Nighthawk

printed off for file, may come in at sometime



#4 Artfull-Bodger

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Posted 05 January 2010 - 09:34 PM

very good post Nighthawk!

#5 alhucoll

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Posted 09 January 2010 - 09:48 AM

A very good step by step guide Nighthawk biggrin.gif
Lovely bit of walnut as well!

#6 TheNightHawk®

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Posted 15 January 2010 - 10:22 PM

Thanks to all people who interested and uses weihrauch like me. i have found a trigger unit cutout too. Use it for good biggrin.gif

Attached File  hw100tetikizimi.jpg   45.75KB   104 downloads

And mystery of the steel ball under the action is revealed HERE

Don't have the Quickfill think? Don't be sad , biggrin.gif there is a solution click here

Edited by TheNightHawk®, 15 January 2010 - 10:38 PM.


#7 JIMMER

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Posted 11 March 2010 - 02:19 PM

NIGHTHAWK, I HAVE A BROKEN INDEXING SPRING ON MY HW100 SO THE SINGLE SHOT MAG WILL NOT SPRING OUT. HAVE YOU ANY DIAGRAMS OF HOW IT FITS PLEASE.

REGARDS JIMMER

jeremy.stamp@btinternet.com

#8 Guest_sas5_*

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Posted 15 March 2010 - 08:35 PM

Hi NightHawk,

Could you please tell me how many turns for regulator cap for washer springs for FAC model ? I have tried to clean mine, but forgot to mark exact position sad.gif

Also, hole with tiny ball inside and grubscrew is supposed to be port for manometer? is this true ? If so, any idea what kind of adapter/manometer would be suitable to use?

Thank you

#9 TheNightHawk®

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Posted 18 March 2010 - 10:10 PM

QUOTE(sas5 @ Mon Mar 15 2010, 20:35) <{POST_SNAPBACK}>
Hi NightHawk,

Could you please tell me how many turns for regulator cap for washer springs for FAC model ? I have tried to clean mine, but forgot to mark exact position sad.gif

Also, hole with tiny ball inside and grubscrew is supposed to be port for manometer? is this true ? If so, any idea what kind of adapter/manometer would be suitable to use?

Thank you


i did not remember but it is i think 2mm deep.

manometer port is metric 6, the part you need is

1/8"bsp female x M6x1 metric male taper thread

you can buy it from HERE

#10 TheNightHawk®

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Posted 18 March 2010 - 10:14 PM

QUOTE(JIMMER @ Thu Mar 11 2010, 14:19) <{POST_SNAPBACK}>
NIGHTHAWK, I HAVE A BROKEN INDEXING SPRING ON MY HW100 SO THE SINGLE SHOT MAG WILL NOT SPRING OUT. HAVE YOU ANY DIAGRAMS OF HOW IT FITS PLEASE.

REGARDS JIMMER

jeremy.stamp@btinternet.com


it is pictured in pic number 6 follow the post

part number is cs748 in the diagram.

#11 POK!

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Posted 20 March 2010 - 08:45 AM

Your o-ring for valve cap (11x1.5) is too large c/s. Factory size is 12x1.2 - even this is too large c/s. Both these sizes suffer installation damage. groove/channel containment surface dimensions should exceed o--ring c/s. 12x1 is the correct size.

Inside Reg Valve (2 brass components) is 2x2 (factory) o-ring. Again this is wrong size and suffers over-compression. Replace with 2.57x1.78 (same as reg inlet)

Edited by POK!, 20 March 2010 - 08:51 AM.


#12 TheNightHawk®

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Posted 20 March 2010 - 09:43 PM

thank you POK! i changed valve cap o ring before, it leaks sometimes. you are right, 12x1 is better. i forgot to mention, mine developped a leak 2 days after the installation from the valve cap, i changed with a smaller diameter as you mentioned here. i thinked it is from loose bolt or over tightened barrel grubscrew.

is that Inside Reg Valve (2 brass components) is o ring 132 in the diagram?

Edited by TheNightHawk®, 20 March 2010 - 09:47 PM.


#13 POK!

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Posted 20 March 2010 - 10:01 PM

Breech block - 12x1.2 IMO too large c/s. It will seal on assembly but gets pinched between block and action body acting as a gasket "crush installation", this can lead to extrusion and failure. Any subtle shift of breech block position and it fails (i.e tighten barrel grub screw). Although technically it's already failed as soon as fitted. 12x1mm much better, deforms under load to seal and can be reused.

The other o-ring is unlisted and doesn't appear on any parts diagrams/lists. It seals the 2 brass components that make up the reg valve body. Factory is 2x2mm. This o-ring also gets pinched during assembly, it's 2mm ID interferes with reg valve (ball bearing) seating. Replace with 2.76x1.58mm

Edited by POK!, 20 March 2010 - 10:03 PM.


#14 Gambo

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Posted 28 March 2010 - 10:43 AM

Thanks for sharing that with us, it made great and helpful reading!!!

atb, Gareth.

#15 TheNightHawk®

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Posted 29 March 2010 - 08:53 AM

Weihrauch HW 100, 15.6 x 2.5 HW 2682B
Weihrauch HW 100, 37.1 x 1.6 HW 2682C
Weihrauch HW 100, 32 x 2 HW 2603A= 5.5 MM or B= 4.5 MM
Weihrauch HW 100, 13 x 2 HW 2704
Weihrauch HW 100, 3 x 1.5 HW 2655D
Weihrauch HW 100, 12 x 1.2 HW 2658
Weihrauch HW 100, 5.5 x 1 HW 2659A
Weihrauch HW 100, 4 x 1.5 HW 2618A
Weihrauch HW 100, 2.57 x 1.78 HW 2665
Weihrauch HW 100, 7 x 1.5 HW 2666
Weihrauch HW 100, 7 x 1.5 HW 2668
Weihrauch HW 100, 10 x 1.5 HW 2672
Weihrauch HW 100, 8 x 1.5 HW 2679
Weihrauch HW 100, 2.57x1.78 HW 2703B

Original O ring sizes with part numbers.




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