Hi, Your tractor has controls a little different to mine, but the operation is mostly the same.
The noise you tell me I think is a knocking or a hammering sound? Like you hit a thick piece of timber with a hammer? Does it also seem related to engine speed?
The outer lever with the round ball-shaped handle is the Draft Control, and the inner square-shaped lever is the Position Control.
"Draft" regulates lifting strength; or will sense and regulate load. "Position" regulates lifting height, and that height will be kept automatically.
The Draft Control is used when you are ploughing the soil. You set the lever at a suitable location and it will let the hydraulic system "feel" the load on the tractor and adjust the height of the plough to keep it from overloading the tractor and losing grip. When using the Draft function, the Position lever is usually near the top, and when you want to raise the plough to turn around you just pull the Draft lever right up.
The Position lever is used when you want to lift an attached implement to a specific height. In this mode, the Draft lever is usually at the top.
The "Position" lever also engages a function called "Constant Pumping" which is used only when a hydraulic attachment such as a loader is connected to the system. This function should never be used without an attachment connected - otherwise it will destroy the internal pump.
You said the Position lever doesn't work, but the Draft lever does. When you are using one lever, is the other lever at the top? Remember, the Position lever cannot be in "Constant Pumping" position - that is the cause of the noise I believe you are hearing.
Here is what I would like you to check. Do these first steps with the engine stopped:
1. Look under the round arch-shaped mount for the lever assembly. You will see the shafts for the levers. The first pic below is what mine looks like from underneath. The Position control shaft is a tube with the lever near one end but not at that end, and the Draft control shaft is inside it. Move each lever and you should see the Position control tube moving, or the end of the Draft control shaft moving when you push or pull the relevant lever.
2. Next, start up the engine and let it idle. Carefully raise the 3PL arms with the Draft lever.
Now both levers should be raised. You should hear the knocking noise when the arms stop at the top.
3. Next, increase the engine speed a little and note if the noise knocks faster.
4. Next, move the Position lever toward the "Lower" direction and note if the noise stops when the arms begin to lower.
5. Otherwise the arms might not lower. If they don't, push the Draft lever toward the "Lower" direction and again note if the noise stops at the moment the arms begin to lower.
Please reply with your answers and comments on anything you saw happen, or not happen, in each of these test steps.
The second pic is what my quadrant and lever set looks like from the driver's seat.
The third pic is the view from the front of the tractor.
Check these things carefully please, and let me know your results.
Pat. :drink:
digging a trench for new transpiration pipes off the septic system here at home. All finished now, :thumbsup: but what a whole new ball game that is ... seems a backhoe has a mind of it's own at times! :laughing: Also helping a good mate with a gearbox conversion on his big tilt-tray, other mechanical work on vehicles for various people - the list never ends! :confused2: Finally getting on top of things though.
