Roadster Posted October 9, 2011 Share Posted October 9, 2011 I have an ex military Douglas aircraft tug based on a David Brown tractor; probably a 990. If it was an agricultural tractor I would expect to use a mineral type brake fluid but as it is also fitted with front wheel brakes I am wondering what is the correct fluid to use. Does anyone have any information on these tugs which could give a definitive answer? The specification plate is dificult to read but I can make out that the Douglas model is 9B. Thanks for any advice. Rod Quote Link to comment Share on other sites More sharing options...
Roadster Posted October 10, 2011 Author Share Posted October 10, 2011 Sorry I was a bit lazy last night. I cleaned off the identification plate properly today. The beast is a: "Tractor wheeled aircraft medium with winch" 16A/2791 Chassis No DT225 Contract no.A/C TS/NW4315/AC12ac (the 1between the C and the 2 may only be a mark on the plate) Douglas specification NS 1359B Also a photo for you to enjoy! Rod Quote Link to comment Share on other sites More sharing options...
chevpol Posted October 11, 2011 Share Posted October 11, 2011 thats nice! Mark Quote Link to comment Share on other sites More sharing options...
trustmeimamechanic Posted October 12, 2011 Share Posted October 12, 2011 Don't think that year DB tractor would of had hyd brakes ..... be careful ... some AG stuff use's LHM or mineral brake oil NOT brake fluid..... put the wrong stuff in and its goodbye seals . Quote Link to comment Share on other sites More sharing options...
diamond-t-steve Posted October 12, 2011 Share Posted October 12, 2011 Douglas still exist. You could always give them a ring and ask them. I'm sure they would be happy help you out. Quote Link to comment Share on other sites More sharing options...
Roadster Posted October 12, 2011 Author Share Posted October 12, 2011 (edited) Thanks for the replies. My concern is whether it is a mineral or EG type brake fluid as most agricultural tractors use mineral fluid. This one has four wheel brakes! I spoke to someone at Douglas yesterday who was very helpful and is sending me a lubrication chart for this tractor: it is a "Taskmaster". I had not contacted Douglas before as I had read somewhere that they had binned all their records of the older tugs. They still have technical info and are happy to share it. I will post the answer to my query when I get it form Douglas. Rod Edited October 12, 2011 by Roadster sp Quote Link to comment Share on other sites More sharing options...
Masseyboy89 Posted October 14, 2011 Share Posted October 14, 2011 What a gem! Quote Link to comment Share on other sites More sharing options...
Roadster Posted October 29, 2011 Author Share Posted October 29, 2011 I did get a very helpful reply fro Douglas with a list of all fluids used in this tractor. For anyone elses info if needed; it takes conventional (not mineral) brake fluid. Thanks again for your replies. Rod Quote Link to comment Share on other sites More sharing options...
Pavy8 Posted October 29, 2011 Share Posted October 29, 2011 This is quite an interesting piece, i always have had a soft spot for MV plant & machinery. I hope you keep us updated on this project Quote Link to comment Share on other sites More sharing options...
mrpye Posted November 14, 2011 Share Posted November 14, 2011 Hi there Roadster,I also have one of these but mine has a 10 ton Boughton winch on the back of it. I have found out quite a bit about the braking parts on these tractors as my brake system has needed a total rebuild. It is based on ford commercial parts which I have found to be Ford ET6 (thames). I also have an ex RAF manual for this vehicle i could possibly copy for you if you like? Would it be possible for you to send me a copy of the lubrication chart you got from Douglas please? I contacted them a few years ago but they wern't interested in the older vehicles then, I may have to try again.RegardsMatt Quote Link to comment Share on other sites More sharing options...
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