decoybob Posted July 21, 2011 Report Share Posted July 21, 2011 Hi I have a Weihrauch HW90 with a Theobone Gas Ram. I have been trying to put more pressure into it, at the moment it is 9.5lb. Unfortunately I can not get any pressure into it, although I know the pump is not faulty as I have successfully used it on a friend's gun. Can anyone offer advise with this problem please? Quote Link to comment Share on other sites More sharing options...
Tiger955i Posted July 21, 2011 Report Share Posted July 21, 2011 Could the valve in the back of the 90s cylinder be sticking? The one on my old Fennman used to from time to time and in the end I replaced it. Hope this helps. Quote Link to comment Share on other sites More sharing options...
wilam Posted July 21, 2011 Report Share Posted July 21, 2011 (edited) What type of pump are you using? The Gas ram pressure is very high, a normal pump will not do. From memory I think the pressure rquired is in the lower 1000s psi. 1000-2000 psi. So a bike pump has not chance, also if using Theoben pump/kit the first few pumps only prime the system. Had a HW90K lovely rifle, now have a Theoben Evo. Both nice but the HW trigger is "golden". Edited July 21, 2011 by wilam Quote Link to comment Share on other sites More sharing options...
Davy Holt Posted July 21, 2011 Report Share Posted July 21, 2011 (edited) Hiya, As above you need to use the correct pump for the gas ram to get the pressure.... Cracking rifles I still miss my .177 that I stupidly sold at the start of the year. Edited July 21, 2011 by Davy Holt Quote Link to comment Share on other sites More sharing options...
Clubshot Posted July 24, 2011 Report Share Posted July 24, 2011 (edited) Had kit to fill off Dive Bottle Big issue is very easy to go over Legal Sub 12.FP Limit But seems other Gun part's Fail If found to be over - when repaired as breaks part's Chance Gun will not be returned - but handed over to Police as a Fire Arm Try and find a Local Gun Smith who is able to get it Right - BOB/R Edited July 24, 2011 by Clubshot Quote Link to comment Share on other sites More sharing options...
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