Author Topic: Beeman Chief Redo  (Read 928 times)

CraigH

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Beeman Chief Redo
« on: March 06, 2018, 06:39:56 AM »
I have had poor luck with a few Beeman Chief rifles.   This is a model I really would like to appreciate but that has been difficult indeed.   There have been many issues, both minor and very serious.   An example of the last would be a deep gouge in a barrel (more than 1/16” deep) that the factory tried to grind out and failing that, blued the barrel and assembled it to a rifle.

The particular Beeman Chief (version 2 with tandem o-ring probe) in this post, initially had a poor shot curve running from approximately 890 fps down to 800 fps in a straight line with under 15-20 shots depending on pressures used.  This with the spring adjuster turned full out.   No bell curve whatsoever and not at all as desired.    Trying to remove the hammer spring for modification, which is a simple process, turned into an unmitigated disaster due to a jammed fastener from the factory (about which more later) that had to have its head removed with an end mil, and subsequent removal of the thread body with vise grips, turning very hard all the way.   It took over two months – one email and three phone calls to Beeman (S-R Industries actually) to final get a new bolt/probe sent.   Apparently not much IDC at Beeman.

During the parts wait, I shortened the factory hammer spring to 2.24” in length, flat and ground, which will be run with zero preload.   Also bought some other springs but do not think they will be satisfactory.   Also spent considerable time with the trigger assembly – really pretty nice now.

With all parts in hand, the assembly began, but problems developed.   It turns out that the initial jammed rear breech screw was caused by the tapped hole in the rear air tube cap being too far back to allow proper alignment with the other parts.   The new shcs would not start into the assembly but easily screwed into the bare rear cap (I had previously run a 0.7mm pitch tap through with practically no metal removal).   I continued to carefully try to get the screw started with a T-hand Allen wrench and finally got in going but it was a firm installation.   This will require re-centered to a larger size in the mill later.

The finally problem was the stock retaining screw would not start.    I could see the side valve retention screws were not into the stock as they should be.   Seems the stock is warped in the vertical plane and the action rocks fore and aft.    After much messing about, finally got the screw to start and pulled things together.    But the front of the stock does not touch the air tube by about 3/16”.    That will have to be cut to a flat plane.    Not much factory quality control.

And finally some good news!    The rifle now runs at a power level I like for suburban pesting – about 780-800-780 fps for about 22 shots between 1700 psi and 1275 psi.   And since there is no preload, the adjuster can be turned in for more fps/fpe.   A full graph of 200 psi to 1075 psi is below.

EDIT:   Hammer spring was modified to 2.42", not 2.24"  -  from about 2.6"
« Last Edit: March 11, 2018, 12:34:48 PM by CraigH »


  • Lone Tree, Colorado
Craig

Beeman QB78D - Beeman P17 (2) - Beeman Chief
Benjamin Marauder Pistol
Benjamin Maximus Hunter
Benjamin Wildfire
CCS 2400KT; .22 14.6" LW barrel "Verminator"
Crosman 2240; 3 Carbines, 1 Stock Pistol
Crosman 1322C; 18" Carbine, FTP, Steel Breech
Crosman 1377; Phase 2
Crosman 1077 - Crosman 2100B
Gamo Urban
SPA PP700S-A .22
Umarex 712 - Umarex P.08

Vintage
Crosman 130 - 150 - 180 - 600 - Mark I - 38C; .22's
Hahn Super BB Repeater

Alan

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Re: Beeman Chief Redo
« Reply #1 on: March 06, 2018, 06:56:33 AM »
I see Amazon has this PCP for as low as $163. So I'm not too surprised at the issues. However, Beeman has had a good reputation with respect to quality control, even on their lower-priced airguns. Too bad you're the recipient of a lemonized version. The good news is, you've overcome most of them.
  • Roswell, New Mexico
Alan

I have an Omega compressor. If you're a fellow Guild member, and you pass through Roswell, NM, I'll fill your portable tank as a courtesy.

CraigH

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Re: Beeman Chief Redo
« Reply #2 on: March 06, 2018, 08:19:35 AM »
Thanks for your reply, Alan.

My (three) Chiefs came from PA.    They were of course excellent on customer service.   There were long out-of-stock waits though.    And the delivered sale price was even lower.

Yes, I did overcome!   I was quite convinced I was being tested!   None of my other PCP's (or other types) have had such issues.
  • Lone Tree, Colorado
Craig

Beeman QB78D - Beeman P17 (2) - Beeman Chief
Benjamin Marauder Pistol
Benjamin Maximus Hunter
Benjamin Wildfire
CCS 2400KT; .22 14.6" LW barrel "Verminator"
Crosman 2240; 3 Carbines, 1 Stock Pistol
Crosman 1322C; 18" Carbine, FTP, Steel Breech
Crosman 1377; Phase 2
Crosman 1077 - Crosman 2100B
Gamo Urban
SPA PP700S-A .22
Umarex 712 - Umarex P.08

Vintage
Crosman 130 - 150 - 180 - 600 - Mark I - 38C; .22's
Hahn Super BB Repeater

Christopher

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Re: Beeman Chief Redo
« Reply #3 on: March 06, 2018, 06:08:44 PM »
Good job. Way to hang with it and fix the issues. You a machinist? You seemed to know what you were doing with your Chief. Great write up too. As slow as I type by the time a thought leaves my brain and goes to my fingertips some things get lost in the transmission  :o

Chris

  • dead end road KY

CraigH

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Re: Beeman Chief Redo
« Reply #4 on: March 07, 2018, 04:04:04 AM »
Thanks, Chris!

Just a hobby tinkering "machinist".     I've had a few mini-lathes (of quite variable quality) now and then.   I removed the head of the poorly installed machine screw with an end mill in a drill press.   I just last week bought an LMS HT Bench Mill.

https://littlemachineshop.com/products/product_view.php?ProductID=5500
  • Lone Tree, Colorado
Craig

Beeman QB78D - Beeman P17 (2) - Beeman Chief
Benjamin Marauder Pistol
Benjamin Maximus Hunter
Benjamin Wildfire
CCS 2400KT; .22 14.6" LW barrel "Verminator"
Crosman 2240; 3 Carbines, 1 Stock Pistol
Crosman 1322C; 18" Carbine, FTP, Steel Breech
Crosman 1377; Phase 2
Crosman 1077 - Crosman 2100B
Gamo Urban
SPA PP700S-A .22
Umarex 712 - Umarex P.08

Vintage
Crosman 130 - 150 - 180 - 600 - Mark I - 38C; .22's
Hahn Super BB Repeater

canadian_shooter

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Re: Beeman Chief Redo
« Reply #5 on: March 11, 2018, 12:00:18 PM »
WOW! I am so glad my Chief did not have any of those issues. Only required some trigger work. I can put 5 in same hole at 35 yards all day with JSB 18.13. I would have just kept sending them back until they sent me one that was right. That is what warranty is for, after warranty I would then do what I had to make perfect. You are much more patient than I. Glad you got it all sorted out.   :D
  • South River, Ontario, Canada
Airguns:
1976 Blue Streak .20
1977 Webely Hurricane .177
Slavia 630 .177
Gamo Magnum .22
Umarex Colt Commander CO2 BB (fun blowback)
QB Chief .22
Beeman P17

Powder burners:
too many to list.

CraigH

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Re: Beeman Chief Redo
« Reply #6 on: March 11, 2018, 12:32:30 PM »
I probably would have sent number 3 back.   But my intent was to just modify the excessively strong hammer spring, however, things went very bad, and when the owner starts breaking parts it pretty much become owned.   It was fortunate I could get the part but it surely did take perserverance!

You are quite correct regarding warranties and what their purpose is.

BTW, the hammer spring was modified to 2.42", not 2.24"  -  from about 2.6".
  • Lone Tree, Colorado
Craig

Beeman QB78D - Beeman P17 (2) - Beeman Chief
Benjamin Marauder Pistol
Benjamin Maximus Hunter
Benjamin Wildfire
CCS 2400KT; .22 14.6" LW barrel "Verminator"
Crosman 2240; 3 Carbines, 1 Stock Pistol
Crosman 1322C; 18" Carbine, FTP, Steel Breech
Crosman 1377; Phase 2
Crosman 1077 - Crosman 2100B
Gamo Urban
SPA PP700S-A .22
Umarex 712 - Umarex P.08

Vintage
Crosman 130 - 150 - 180 - 600 - Mark I - 38C; .22's
Hahn Super BB Repeater

canadian_shooter

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Re: Beeman Chief Redo
« Reply #7 on: March 11, 2018, 01:11:51 PM »
I probably would have sent number 3 back.   But my intent was to just modify the excessively strong hammer spring, however, things went very bad, and when the owner starts breaking parts it pretty much become owned.
LOL I hear ya there.
  It was fortunate I could get the part but it surely did take perserverance!

You are quite correct regarding warranties and what their purpose is.

BTW, the hammer spring was modified to 2.42", not 2.24"  -  from about 2.6".    Good to know
  • South River, Ontario, Canada
Airguns:
1976 Blue Streak .20
1977 Webely Hurricane .177
Slavia 630 .177
Gamo Magnum .22
Umarex Colt Commander CO2 BB (fun blowback)
QB Chief .22
Beeman P17

Powder burners:
too many to list.

Monkeydad1969

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Re: Beeman Chief Redo
« Reply #8 on: March 11, 2018, 09:30:40 PM »
Hey Craig,

I thinks it's time for another breakfast, but this time followed up by some shooting.  Let me know.

Joe
  • Aurora, Colorado
Joe the P-Dawg Slayer!!!!!

CraigH

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Re: Beeman Chief Redo
« Reply #9 on: March 12, 2018, 04:55:53 AM »
Joe,

PM sent.
  • Lone Tree, Colorado
Craig

Beeman QB78D - Beeman P17 (2) - Beeman Chief
Benjamin Marauder Pistol
Benjamin Maximus Hunter
Benjamin Wildfire
CCS 2400KT; .22 14.6" LW barrel "Verminator"
Crosman 2240; 3 Carbines, 1 Stock Pistol
Crosman 1322C; 18" Carbine, FTP, Steel Breech
Crosman 1377; Phase 2
Crosman 1077 - Crosman 2100B
Gamo Urban
SPA PP700S-A .22
Umarex 712 - Umarex P.08

Vintage
Crosman 130 - 150 - 180 - 600 - Mark I - 38C; .22's
Hahn Super BB Repeater