Posted by rrlund on October 18, 2022 at 17:00:05 from (69.36.63.7):
In Reply to: Re: Oliver 600 project posted by Bruce from Can. on October 18, 2022 at 16:47:22:
I don't know about the 950s. I know that Oliver could sell the 500s in Canada because the 850 that they were based on weren't available there, but they couldn't sell the 600s because DB did sell the 990s there and the 600s would have been in competition with them.
Here's what Peter Williams the UK DB guy told me in an email. I'll just copy and paste it.
''Your find is interesting, & very David Brown! Its quite common to find tractors built beyond the official last one, I suspect that this was sometimes to use up parts that were in stock.
There were basically 3 main types of 990 Implematics, and associated tractors, best described as
From serial no. 44001 (1st.) fitted with a pair of 6 volt batteries, one each side if the seat.
From serial no. 456233 battery moved to the front, battery box modified to become a toolbox.
From serial no. 476325 toolbox deleted, requiring self supporting fenders to be fitted.
I attach a copy of the information sheet that I have. It also gives information on the change from a forged to fabricated front axle, although the forged axle remained available as an option.
The last type, with self supporting fenders, was at the time of the introduction of the 990 Diesel, basically the first type of white 990 for the USA but with the new styling & brown/white colours, whilst retaining the Implematic hydraulic system (top ling attached to cross shaft). On Selectamatic tractors the top link attaches to a casting on top of the PTO unit containing a spring.''
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