Re: Help with hydraulics

Posted by Ken McWilliams on July 02, 2000 at 06:14:57 from (152.163.195.213):

In Reply to: Help with hydraulics posted by Doc on July 01, 2000 at 22:47:27:

Doc,

Your patient probably has one of three problems.

Low fluid level. Check this first.

The relief valve is not reseating or the gasket on the head plate is leaking.

You have a tractor that is very easy to repair.

Remove the port holes on each side and look inside while raising the lift with a load. Some times you can see fluid squirting out of the pump at a gasket. Or can feel fluid squirting out of the releif valve. Be careful, the PTO shaft is spinning and don't have a shirt sleeve or jewelery that can get snagged. The shaft at that location is smooth, but don't take chances.

The relief valve is on the back side of the pump down at the lower side and is usually submerged.

The pistons are moved by blocks that encircle the PTO shaft. As the PTO shaft spins, the blocks "wobble" and stroke the pistons. Once the fluid has been pumped out of each piston, the fluid goes into the circuitry. First is passes through a check valve. The only other possible leaks are the piston, relief valve or the lowering valve.

My guess is the relief valve or a gasket. I have experienced both on 8N's and 9N's.

The relief valve can by replaced and is usually available by your local Ford tractor repair facility. Remove the 4 bolts around the PTO shaft and pull the shaft straight out. Place a pan under the opening because you will loose some fluid. You will be able to see the relief valve at the bottom of the pump assembly. Use a deep well socket to remove the relief asssembly.

If you have discovered it's not the relief valve, then the unit needs to be removed. While the PTO shaft is removed. Drain the remainder of the fluid via the two drain plugs in the bottom of the transmissin case. Disconnect the linkage from the control lever. This can be done working through the port holes. Remove the 10 or so bolts in the bottom of the transmission case and drop (remove) the entire pump assembly out the bottom.

Get an IT manual from your local TSC or Quality Farm and Fleet. It will show you the circuitry and pictures of the unit.

Don't get overwhelmed, Doc. It's no more complicated than an appendectomy. This unit is very easy to repair.

Ken McWilliams
Dayton, OH

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