Case/David Brown 990 selectamatic mystery part

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singletree
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Joined: Sat Aug 17, 2019 1:44 pm
Location: United States

Case/David Brown 990 selectamatic mystery part

Post by singletree » Fri Sep 06, 2019 6:53 pm

Hello, I am working on a late model ( 1979 ) 990 selectamatic Case/David Brown. I needed to remove the hydraulic control valve, therefore it was necessary to remove the ramshaft. When I removed the cover from the , ( looking from behind the tractor ) , right ramshaft bracket. I wiped some of the hydraulic oil out of the bracket compartment. While I was wiping and soaking up the hydraulic oil I found a small brightly finished steel pin, roller, dowel, etc. The dimensions of the piece, measured with a standard English rule is 3/16 ths. inch diameter by 7/16 ths. Inch long. I cannot locate any place for this piece to fit. If anyone recognizes this piece, I would appreciate your help identifying it. I have looked at all of the schematics that I can locate but, I cannot find the piece. Thanks for any information leading to the identification and/or use of it. Steve

1952CROPMASTER
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Location: Moncton NB

Re: Case/David Brown 990 selectamatic mystery part

Post by 1952CROPMASTER » Sat Sep 07, 2019 7:20 pm

Where the Valve Chest (Control Valve) is bolted to the ramshaft bracket there is two dowels, one bolt & two Nuts used, to secure the Valve Chest to the ramshaft bracket, I'm guessing that may be one of these dowels,

singletree
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Location: United States

Re: Case/David Brown 990 selectamatic mystery part

Post by singletree » Sun Sep 08, 2019 5:33 pm

Sir, I was hopeful that you were correct however, the diameter of the ( pin, roller dowel,etc ), that I found is much too small . Thank You for your thoughtful reply. Regards, Steve

ALANJ
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Re: Case/David Brown 990 selectamatic mystery part

Post by ALANJ » Sun Sep 08, 2019 5:50 pm

Could you please send a pic ? AJK.

singletree
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Re: Case/David Brown 990 selectamatic mystery part

Post by singletree » Sun Sep 08, 2019 8:04 pm

Sir, I cannot post photos .I could email or text them. Thank you. Steve

singletree
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Re: Case/David Brown 990 selectamatic mystery part

Post by singletree » Sun Sep 08, 2019 9:27 pm

AlAN Sir, I went out and measured the casting face/ portion of the control valve where it dowels and bolts to the bracket.. In the location of the dowels that you refer to in your post, the casting is approximately 1/2 inch thick the dowels in the bracket protrude half way through the flange on the control valve. The dowels are chamfered/ beveled slightly , this helps to guide the control block onto them. Also the dowel holes in the control valve , I forgot to measure them , they are probably metric drilling , however I would estimate them to be between 1/4 -- to 5/16 ths in diameter. The small piece that I have found and inquired about is not beveled . It is cut on a clean 90 deg. angle across both ends. Thank You Steve

ALANJ
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Location: Co. Durham

Re: Case/David Brown 990 selectamatic mystery part

Post by ALANJ » Mon Sep 09, 2019 7:22 am

If you send a secure E address I can send my E address for you to send a pic. With a pic ,all things are possible.we,ll get there. AJK.

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manxmac
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Re: Case/David Brown 990 selectamatic mystery part

Post by manxmac » Mon Sep 09, 2019 9:24 am

Long time since I have been in there but I seem to remember a similar dowel/pin seen from the rear. If you remove the square plate from the right hand rear you will see 2 or 3 controls which are activated by the selector switch in the cab for position, draft and TCU. One of these has a slide with a spring attached, I believe one end of the spring may be retained by the type of pin you describe. The selector switch lever is also attached by a roll pin but this is external.

singletree
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Re: Case/David Brown 990 selectamatic mystery part

Post by singletree » Mon Sep 09, 2019 1:07 pm

Manxmac Sir, I am familiar with the spring anchor that you refer to, that is not the part . I have come to the conclusion that the ( part or item ) that I found is "foreign" to the tractors system. I don't know how it could have got placed there, unless at some point in the tractors history this item was placed there when someone was working on the tractor. That is the only explanation that I can come up with. Thanks for your reply. Steve

ALANJ
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Location: Co. Durham

Re: Case/David Brown 990 selectamatic mystery part

Post by ALANJ » Mon Sep 09, 2019 5:22 pm

Try this.Remove the rear ramshaft cover by unscrewing the 4 Phillips screws .Inspect the sliding bar located under the ramshaft cam.The sliding bar consists of two vertical bars ,one twice as long as the other.They are held together as one assembly by two horizontally mounted pins.
They occasionally do become displaced. Are they dimensionally equal to your rogue pin ?
Here,s hoping, AJK.

singletree
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Re: Case/David Brown 990 selectamatic mystery part

Post by singletree » Tue Sep 10, 2019 1:14 am

ALANJ Sir, The pins that you are referring to are indeed in place . I appreciate your curiosity. I have concluded that the item or part, whatever it is , can not be incorporated into the ramshaft/ lift arm mechanism. Regards, Steve

ALANJ
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Joined: Wed Oct 11, 2017 9:13 pm
Location: Co. Durham

Re: Case/David Brown 990 selectamatic mystery part

Post by ALANJ » Tue Sep 10, 2019 7:49 am

Yes, but are the dimensions identical ? If so, it may be that the previous slide bar failed and the displaced individual parts were not found /removed etc.etc.
Also is the said mystery part case hardened ?
Final thought, the sensing cable has a pin on the ramshaft end which fits into the clevis pivot which in turn operates the depth control sliding bar.The dimension of this pin is similar to the found item.To check ,inspect carefully for a hole in the centre where the cable would have originally gone through.Occasionally the pin would detach from the cable and if the repairing fitter was less than careful the pin could be left in the ramshaft housing.
Worth a look. AJK.

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