Correct gearbox/hydraulic fluid for 1964 DB 990

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AJT4
Posts: 3
Joined: Tue Jul 09, 2019 2:34 pm
Location: Cheshire

Correct gearbox/hydraulic fluid for 1964 DB 990

Post by AJT4 » Wed Aug 21, 2019 8:00 pm

Evening all!

I’ve posted this elsewhere but seems to be so many different opinions on which gearbox/hydraulic fluid should be used in a 1964 DB990 implematic.

I’ve has the following
15W/30 Universal (seems to be the most readily available and at a reasonable price)
20W/30 (only really seems available via DB shop)
SAE50 (seems to be a classic car oil of some sort)
SAE90 (fairly available)

Any ideas? best preferably not to costly but if it’s good stuff I’ll potentially get it.

Thanks

philedge
Posts: 271
Joined: Sun Dec 03, 2006 11:27 am
Location: Chester UK

Re: Correct gearbox/hydraulic fluid for 1964 DB 990

Post by philedge » Wed Aug 21, 2019 9:32 pm

Universal tractor oil or super universal tractor oil. Maybe the same your running in the engine, or could be if you only want to keep one oil in stock
'66 880 Selectamatic rat.

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db2d
Posts: 2178
Joined: Fri Feb 24, 2012 10:01 pm
Location: Monmouthshire

Re: Correct gearbox/hydraulic fluid for 1964 DB 990

Post by db2d » Wed Aug 21, 2019 9:55 pm

The gearbox and hydraulic system share the same oil. There is a filter for the hydraulic system situated on the underside of the gearbox, this filter should be cleaned prior to new oil being introduced.
Universal 15-30 can be used but sae 50 or sae 90 gear oil is by far the better option. These tractors left the factory with sae 50 gear oil in the gearbox and sae 140 in the reduction units. These oils are available from davidbrownparts.com and most oil suppliers.

Mover
Posts: 24
Joined: Sun Aug 12, 2018 6:29 pm
Location: County Durham

Re: Correct gearbox/hydraulic fluid for 1964 DB 990

Post by Mover » Fri Aug 23, 2019 8:01 pm

Out of interest, as you say, early models left the factory with SAE140 in the reduction units but later models like the 90 and 94 series used EP90. Was this down to any fundamental changes in the reduction units or was it advancements in the lubrications technology?

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