Hi - Could you point me in the direction of the tutorial for adjusting the HW110 regulator that you have put together. Also would adjustments on the HW44 regulator be the same - Many thanks - Bernie
Hi Bernie,
Here are the instructions. I have corresponding photos that I’ll have to dig up - they may be in the HW110 Owners Group on Facebook.
As to your question, yes - I believe these instructions will also apply to your HW44 - (other than stock removal) as the actions are basically the same between HW44 pistol and HW110 rifle.
HW110 Reg Pressure Adjustment: I promised to do another tutorial on how to adjust the regulator pressure on the HW110.
It took a while to markup all the photos, but its done. I hope that you find this useful:
ADJUSTING HW110 REGULATOR PRESSURE:
Step 1: Remove the two M-4 allen head stock bolts – (remember that the shorter bolt is towards muzzle when reassembling)
Step 2: Remove the trigger guard – simply remove the M-2.5 allen screw and then tap out the pin with a light hammer.
Step 2b: Loosen the two M-2 barrel grub screws in the barrel band. (this step is not required, but may prevent scratching your barrel if you get to aggressive “wiggling” in step 3)
Step 3: Move forward the metal “backbone” which barrel band slides onto. This is accomplished by removing the M-2.5 short Allen screw. Then wiggle / tap the backbone so that it moves off the trigger assembly – you must move the backbone at least 1/2” towards the muzzle, as the lip of the backbone holds the trigger assembly in place - you can’t lift the trigger assembly out without moving the backbone off the trigger assembly lip.
Step 4: Lift out the trigger assembly. It simply just lifts out – the back end of assembly tucks under first when reassembling.
Step 5: Lift out the magazine advance - note long end of pivot points forward for reassembly (I marked forward on mine in pink ink – see photo).
Step 6: Remove the air cylinder by loosening M-5 black Allen screw. Best to use a long Allen key and insert from back of breech. Air cylinder does NOT have to be depressurized before removal - it is a self contained unit and can remain pressurized during removal.
TIP: I have two M-5 allen keys – I leave the key in place in the screw after sliding the air cylinder out. This makes it simple as it keeps the M-5 screw held in place for reassembly – rather than having to get the screw back into position. You will need the 2nd M-5 allen key to adjust the reg pressure adjustment screw (Step 9).
** Note at this point that you have only removed the two stock bolts, two M-2.5 allen screws, tapped out a pin, and unscrewed the M-5 air cylinder – the rest came apart like Legos! You’re HW110 is a simple rifle to work on – crazy simple !! **
Step 7: Drain the air cylinder by turning the M-2.5 pressure release screw IN (clockwise) slowly - until you hear air escaping. Drain all the air, then close the drain screw by turning back OUT (counter-clockwise)
Step 8: Open the regulator Test Port grub screw (M-3 Allen). Do this VERY slowly - as there may still be some air in the regulator. There is a ball bearing under the screw - remove this. There is an o-ring at the bottom of the reg test port - leave this in (or remove and put it on the end of reg test gauge) when screwing in reg test gauge (source for the gauge is HWTuning - a UK store). AVOID quickly removing/draining this grub screw/port quickly or you risk blowing the steel ball bearing and o-ring out – and you will be hunting all over your room for them, lol.
TIPS: Do NOT overtighten the reg test gauge when screwing it in - just tighten until you feel a bit of pressure on the o-ring - when you add air pressure, the pressure will help seal it. When reassembling after you have completed setting the reg pressure, do NOT overtighten the reg test port grub screw - just tighten until you feel a bit of pressure on the o-ring. Otherwise, by over tightening you can deform the o-ring at the bottom of the reg test port - possibly creating a leak (and permanently damaging the o-ring).
Step 9: After screwing in the reg pressure test gauge, add air to pressurize the air cylinder. The factory reg set pressure on a “FAC” HW110 is 150 bar. The sub-12 factory reg set pressure is 100 bar. Note that both of these factory reg settings are actually marked on your Wika cylinder pressure gauge – see the larger white triangle type marks on the gauge. To change the reg pressure, first you must loosen or remove the locking grub screw (M-2.5 Allen) for the regulator adjuster (M-5 Allen). Turn in (clockwise) the M-5 adjuster to increase reg pressure - counterclockwise to reduce reg pressure.
Strategy for adjusting reg pressure: The Best Strategy to adjust reg pressure is probably to drop the reg pressure down to 100 bar or less (if you have a FAC rifle currently set at 150 bar) - by turning the M-5 reg adjustment screw about 1/4 turn counterclockwise (1/4 turn is a significant amount – most adjusting will be slight turns). Then when you pressurize the cylinder, you can increase the reg pressure to where you want it by turning the 5mm screw IN - clockwise. I had no luck trying to REDUCE the reg pressure once the cylinder was pressurized. If you find you need to reduce the reg pressure further to reach your desired pressure, I always depressurize the cylinder, then reduce the pressure by turning the M-5 adjuster further counterclockwise – then put air back in. Summary – when the cylinder is pressurized, you can adjust reg setting up but not down – so plan accordingly – so that you don’t have to keep pressurizing and depressurizing to get to your desired regulator set point.
Step 10: After you have set your desired reg pressure, remember to tighten down the M-2.5 reg lockdown grub screw.
Step 11: Depressurize your air cylinder following directions in Step 7. Remove the reg test gauge and put the o-ring back in bottom of the reg test port (if it came out when removing the gauge). Put steel ball back on top of the o-ring. Then tighten the M-3 grub screw - as in Step 8 - just until you feel some tension on the o-ring. Don’t overtighten or you will deform the o-ring and create a leak – you can always tighten a bit more if you need to.
TIP: You should put some pressure back in the cylinder and check the reg test port for air leak - BEFORE reassembling the cylinder back into the rifle.
REASSEMBLY: follow the above steps in reverse
