David Brown Tractor Forum

From a safety point of view, the way to think of the electrical circuit is to take account of your wire rating and choose a fuse accordingly to protect it, regardless of whether the load at the end of it, lamps or whatever, need a higher or lower fuse rating. In a non-malfunctioning circuit, if the ...

what would you expect to pay for one these days?

Hi to all, does anyone know where i can get a steering ball tube for a 990 selectamatic 1967? (the tube thing that's in two halves and allows the ball bearings to recirculate around the steering nut). i have tried my local case agent and he says they are 'plus fourni' which i think means no longer a...

Is the double acting valve unit an actual D.b. part for this tractor, Erkki? It sounds like a good solution if i can get one, otherwise i'll have to keep on juggling as Jimc says.

Thanks for the drawing db780, i have looked at that one before but struggled to see the exact path of the oil. looking at it again and with a re-read of erkki's explanation i think i have grasped what's happening. so it is necessary to use the old 3 wheeled valves or installing another valve somewhe...

Thanks everyone for your help and advice. I was hoping that there was a way to supply the external valve without effecting the raising and lowering of the linkage but i guess not. If anyone has a diagram of the internal pipework i would really appreciate a look so i can get my head round what's goin...

aww..! but that means i have to keep twiddling knobs all the time while using the mower. and to make it worse they're not even knobs; the main one is just a nail sticking through the hole in the shaft. can't i just plumb into a live feed that will supply the exteranl valve block? (without affecting ...

I thought the hump was an independant supply straight from the pump not controlled by the quad lever...the hydraulic circuit diagrams i have are not clear at all. does anyone have a detailed plan of the hydraulic circuitry for my model? I have previously piped the loader from the 3 wheeled valves an...

thanks for the reply Powerrabbit but it's not the loader that comes up first when i operate the loader on the external valve block. i have to get the links all the way up before the loader responds although it will drop via the valve without dropping the links. the external valve block (3 valves) is...

Hi to all, i have an AL1 loader and i am wondering if anyone knows why my 3 point goes up when i operate my loader through a separate valve block supplied by (and returned to) the 'camel's hump'? i have to wait til the linkage is fully up before the loader rises although it's alright after that. Als...

just to add my tuppence worth, albeit very late in the thread.... the wire you connected to, i assume, a 12v supply at the ignition switch was probably an earth wire or a fuse should surely have blown, in fact i can't understand why a fuse would not have blown anyway. it would be worth checking your...

Oh, i forgot to tell you to tighten down the locknuts after backing out the bolt 1 and 1/2 turns.

There are several posts on the site regarding this procedure so read them all if you can in case i've forgotten something and for more details on the pedal freeplay etc.

anyway, best of luck again.

Hi Paul, where the engine meets the gearbox underneath you will find a hole about 6 inches wide and 2ish deep which may have a plastic cover over it. get the cover off if it's there, and around the clutch mechanism inside the big hole are 3 allen bolts with locknuts on. if there isn't one visible th...

Hi to all, discovered i had a 'seized' live drive clutch on the 990 a couple of months ago when i bought a disc mower and had to start her up in drive to use it. i read loads of posts as to how to free it and the bottom line was that if adjustment didn't sort it then it was going to have to be a spl...

let us know the result as i've had similar probs.

how much trouble was it getting the chest out by the way?