This is the only pic I have of a filter, look at the bottom of tank, that line goes into a white micron disposable filter. It was the smallest housing I could find. It had barbed ends on it for 1/4" tube and larger. I cut off the barbs and threaded it to accept the m5 hose fittings.
These are the motors I have, I can't find anything about running them higher voltages.
http://www.robotmarketplace.com/prod...-218-1003.html. But if the larger (10 n 11 tooth) sprockets fit (chain clearance) I'll just stay 12 volts and pick up speed with gearing. I think that would probably be the best way. I've been acquiring several spare parts for future builds from this dozer build so adding a couple sprockets to the pile would help fund a future project (sounds good to wife).