David Brown 780 - Altenator

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David Brown 780 - Altenator

Post by diamadiss » Tue Jan 19, 2016 10:45 pm

I want to install in my David Brown 780 Selectamatic a generator like has the David Brown 990 Selectamatic which has the voltage regulator embedded and not extra like the generator of 780 Selectamatic. Do you know if the generator of 990 (or different model of David Brown which has the same type of generator) fits on David brown 780 Selectamatic and which is the part number (because I want to buy the original generator from CASE IH).

Picture 1 -The original DB 780 generator:

Picture 2 -The type of generator that I want to install in my DB:

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RE: David Brown 780 - Altenator

Post by John_Allen » Wed Jan 20, 2016 8:39 am

780s weren't normally fitted with an alternator but you can convert to one if you use a mounting from an 885. The later ones had alternators but some earlier ones had dynamos so make sure you get a bracket from an alternator-equipped one!

You will need to alter the wiring - there is an FAQ (on main menu) that deals with this.

However, I still say that a good dynamo and control box is just as good as an alternator on these older machines, Both my tractors have dynamos and I have had few problems with them. Similarly, the Ferguson I owned still had it's original dynamo when I bought it - and when I sold it. A recently deceased friend had a MF135 that he bought in 1968 and it still has its original dynamo and he had little trouble with that until he stopped using it regularly.

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Re: RE: David Brown 780 - Altenator

Post by diamadiss » Wed Jan 20, 2016 12:01 pm

Ok. Thanks for the reply. The David Brown 780 which dynamo have installed originally? This with 11 Apmere (part number: K913986) or with 22 Ampere (part number: K928643)?


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RE: Re: RE: David Brown 780 - Altenator

Post by SteveCollett » Thu Jan 21, 2016 3:26 pm

if you bodge an alternator on to the tractor , and I have done many, be very careful to space the attachment bolts very carefully.
If you over tighten the those aluminium pivots they will crack off just like that. so plenty of washers on hand

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