Just Piddling 0 #1 Posted April 29, 2009 I was just looking at a listing for a D180. It states that the engine is directly coupled to an axial piston pump. The direction and speed is controlled by the swash plate, through the travel lever. I guess the pump is hosed to hyd motor(s) driving the drive wheels. Is this true? Are all of the Ds designed this way? There is a German fork lift manufacturer (Linde) that uses this same system design. As long as the fluid stays clean it is bullet proof. I know the Ds were designed in Europe and more complex from the standard WH design, but a true hydrostat performs well above engine HP. Share this post Link to post Share on other sites
kpinnc 14,587 #2 Posted April 30, 2009 I was just looking at a listing for a D180. It states that the engine is directly coupled to an axial piston pump. The direction and speed is controlled by the swash plate, through the travel lever. I guess the pump is hosed to hyd motor(s) driving the drive wheels. Is this true? Are all of the Ds designed this way? Yep, that's about how it works. The D series (except D250) use the same pump and motor as the Sundstrand-powered B and C series (and a few older) autos. NOT to be confused with the Eaton-powered hydros... The difference is that the pump and motor are separate on the D- They are connected with a hydraulic manifold system, and the B and C series simply have the pump and motor bolted together with o-ring seals between them. And as you said, the D is shaft-driven. The B and Cs were belt drive. There are some other minor differences like a splined input shaft on a D pump as opposed to a keyed one on a B/C... but for the most part they are the same creature. The Sundstrands are pretty stout, no doubt about it. But I think the D series tractors were about all they could handle. And like you said, that's as long as contaminates are kept out of the system. Kevin Share this post Link to post Share on other sites
pond195520032003 27 #3 Posted April 30, 2009 Hi Chris, the 18 automatic through D-200 tractors were not designed in Europe! they were built and designed in south bend Indiana! the D-250 was the only one built in Europe and was built by Guthbrob(spelling) and that was after the D's were already being built! yes the 18 automatic, D-160, D-180, and D-200 tractors use a hydraulic pump that sits on a 4 line manifold to the hydraulic motor attached to the rear end! hope this helps some Greg in s.e. ohio Share this post Link to post Share on other sites
TT-(Moderator) 1,162 #4 Posted April 30, 2009 Ah, yes..... the Gutbrod: (they're gear driven - not hydro) Look familiar? :omg: Share this post Link to post Share on other sites
Just Piddling 0 #5 Posted April 30, 2009 Thanks, I thought they were all European. Now I know. Is this the only horse to use a axial piston pump? Aren't the Eatons radial piston pumps? Edit- After reading Kevin's post again, I guess I should ask are the Sunstrands Axial and the Eatons Radial? Share this post Link to post Share on other sites
TT-(Moderator) 1,162 #6 Posted April 30, 2009 After reading Kevin's post again, I guess I should ask are the Sunstrands Axial and the Eatons Radial? I think the Sundstrands are axial piston pumps with a georotor style charge pump and the Eatons are radial ball piston pumps with (what I call) an orbital charge pump. Get my back on this, Gator, would you? :omg: Share this post Link to post Share on other sites
kpinnc 14,587 #7 Posted April 30, 2009 Get my back on this, Gator, would you? As I understand it- you are exactly right. It has always confused me that the Sundstrands were MUCH more complex with more moving parts, and they seem to last forever. The Eaton pumps are so simple in design (meaning a very intelligent design) by comparison, and they seem to give more problems. In addition, the Sundstrands were serviceable by the user- and I mean a complete rebuild. The Eatons were basically a disposable unit. They could be remanufactured, but not much could be done with them by a dealer service department. Kevin Share this post Link to post Share on other sites
Just Piddling 0 #8 Posted April 30, 2009 Thanks for the clarification. That's funny, I had thought of making a small tractor off the axial pump design before I new anything about WH. I reckon I was about 50 years late. Share this post Link to post Share on other sites