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1971 990 dave brown help requested

M

mike 321

New User
hello this is my 1st time trying this type of thing, i just bought a 1971 dave brown 990 , it has 3 shifting levers, and my manual only talks of 2, can any one help with how it should be shifted. and also how to adjust the clutch for the drive /shifting, there is not much pedal .
thank you
 
On a 3 stick 990, the one to the left and forward are the underdrive or "SLOW" gears. The next stick over is your High and Low. Third stick is the 1-2-3-R.

The underdrive(slow gears) shouldn't be used for "Heavy draft" uses, where all the power is going to the ground through the wheels. They come in very handy for uses like rototilling, tight maneuvering, hitching up, or backing wagons.
 
(quoted from post at 14:46:36 02/21/17) On a 3 stick 990, the one to the left and forward are the underdrive or "SLOW" gears. The next stick over is your High and Low. Third stick is the 1-2-3-R.

The underdrive(slow gears) shouldn't be used for "Heavy draft" uses, where all the power is going to the ground through the wheels. They come in very handy for uses like rototilling, tight maneuvering, hitching up, or backing wagons.
Click to expand...

thank you so much, so for normal stuff making hay and such where should that lever be ?
 
For hay it wouldn't matter, just find a comfortable gear.

Also keep in mind it has a 2 speed PTO gear box. Low will give you 540 at 1800 engine rpms, high will give you 540 at about 1100,
 
(quoted from post at 17:03:35 02/21/17) For hay it wouldn't matter, just find a comfortable gear.

Also keep in mind it has a 2 speed PTO gear box. Low will give you 540 at 1800 engine rpms, high will give you 540 at about 1100,
Click to expand...
do you know to adjust the clutch to give me a little more pedal for shifting and starting off?
 
(quoted from post at 20:09:21 02/21/17)
(quoted from post at 17:03:35 02/21/17) For hay it wouldn't matter, just find a comfortable gear.

Also keep in mind it has a 2 speed PTO gear box. Low will give you 540 at 1800 engine rpms, high will give you 540 at about 1100,
Click to expand...
do you know to adjust the clutch to give me a little more pedal for shifting and starting off?
Click to expand...


Is it a 2 stage clutch, or single stage one?
 
(quoted from post at 17:59:46 02/21/17)
(quoted from post at 20:09:21 02/21/17)
(quoted from post at 17:03:35 02/21/17) For hay it wouldn't matter, just find a comfortable gear.

Also keep in mind it has a 2 speed PTO gear box. Low will give you 540 at 1800 engine rpms, high will give you 540 at about 1100,
Click to expand...
do you know to adjust the clutch to give me a little more pedal for shifting and starting off?
Click to expand...


Is it a 2 stage clutch, or single stage one?
Click to expand...
2 stage clutch
 
I have a manual for the white David Brown 990 tractors , was going to post it for sale ,if that would be of use contact me . It covers 990 A and 990 B live drive and non live drive models .
 
(quoted from post at 21:09:21 02/21/17)
(quoted from post at 17:03:35 02/21/17) For hay it wouldn't matter, just find a comfortable gear.

Also keep in mind it has a 2 speed PTO gear box. Low will give you 540 at 1800 engine rpms, high will give you 540 at about 1100,
Click to expand...
do you know to adjust the clutch to give me a little more pedal for shifting and starting off?
Click to expand...

You need and operators manual. It covers all this stuff.
 
(quoted from post at 19:15:09 02/21/17) I have a manual for the white David Brown 990 tractors , was going to post it for sale ,if that would be of use contact me . It covers 990 A and 990 B live drive and non live drive models .
Click to expand...
interested Harvey Hall, can you email me , [email protected]
 
That's good to know. My 4600 also has the 3 stick set up and I haven't had much luck finding info on that arrangement. My assumption was that it was an option for tilling as the Brits seem to have more PTO driven tillage equipment than over here. I typically run my third stick in HI and it seems comparable to other tractors' speeds.
 
On the later tractors they used the same underdrive, but only used 2 levers. On the later ones you push your "High-Low" stick to the left and forward to get "high/slow" and "Low/Slow.
 
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