Correct on the 1855. Closed center hydraulics with the pump on the side. The 1850 pump is internal open center like the 1655. The pump doesn't run directly off a gear on the PTO shaft in the 1850. The shaft runs through a helical gear that permanently mounted in it's own bearings. There's a gear mounted on it's own bearings in the transmission cover,then there's a short shaft above the PTO shaft that has a larger helical gear on it. That shaft runs in needle bearings in the housing,front and rear. All there is,is a big cotter pin that holds that gear to the shaft so the shaft turns in the bearings and the gear doesn't spin on the shaft. That gear runs the pump drive gear off the PTO shaft gear. I thought what had happened was that the cotter pin had broken or come out somehow and the shaft slid out of the gear on mine,but that wasn't it. The White 2-85 and 2-105s used the 1855 transmission and rear end with the better brakes and the closed center hydraulics,but they went back to the 354 Perkins engine. The best of both worlds. The difference between the two was that the 2-105 had a turbo.
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Today's Featured Article - Tractor Hydraulics - The Basics - by Curtis Von Fange. Hydraulics was one of the greatest inventions for helping man compound the work he can do. It’s amazing how a little floor jack can lift tons and tons of weight with just the flick of a handle. What’s even more amazing is that all the principals of hydraulic theory can be wrapped up in such a small package. This same package applies to any hydraulic system from the largest bulldozer to the oldest and smallest tractor. This short series will take a look at the basic layout of a simple hydraul
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