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B. Jones, we just worked through the same problem with Dad's WD. You need to use the "HOLD" feature of the hydraulic system. If you don't have access to the Operators Manual, this verbal description will add to Butch's a little. When correctly set, you will feel the control lever reach an "detent point" mid-way up the quadrant. The detent is actually down on the "Hold Position Valve". This detent is the position that should hold your rams where you want them. To raise them, move the lever up until you get the right lift, and then return to the detent. To lower the rams, move the lever down until the desired position is reached, and then return to the detent position. In the detent position, the pump is not actually applying pressure to the cylinders. The pressure is just trapped there; so it is important that the hydraulic cyplinders do not leak. If they do, AGCO still carries seal kits,, and they are relatively easy to install. To set the hydraulic pump and Hold Position Valve up, follow the hydraulic hoses from the rams to their fittings. The fittings screw into the Hold Position Valve. It has two adjustment screws on it: B and C. "B" is at the rear of the Hold Position Valve, and has a large thumbwheel next to a nosecone. Screw this thumbwheel (may have to clean, lubricate & use pliers) towards the outside of the tractor so that the camshaft plate locks into the control lever plate. There is a nosecone on this end of that thumbwheel that fits into a locating hole in the control lever plate. Go to the front end of the Hold Position Valve, where screw "C" is located and back this screw out most of the way to the stop. The exact position is not critical. This screw is of benefit if the left ram is run forward, rather than back to the lift lever. The Hold Position Valve sits on top of the Hydraulic Pump. Follow it down and to the rear where the control housing is located. You will find another rotating plate there, with a control lever running from it. The rotating plate is also connected to the link rod that runs back to the drawbar for traction control. You want to deactivate this feature. Find the large thumbscrew "A" in the rotating plate, and screw it into the hole in the control housing. The final adjustment is on screw "D" at the front of the hydraulic pump body. When screwed out, the hydraulic rams will react very quickly to movement of the lever up on the control quadrant. Screw D can be screwed in some, and this will reduce the speed of response without affecting the final pressure, or lift capacity. These adjustments are easier to visualize with a picture; I hope that you can figure them out from this description. E-mail me if this requires more clarification. Good luck,
stu (ON)
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