transmission overfilling ?

[winston1]

I do understand what he is saying, I just disagree. I will try another explanation and see if it makes any more sense. If we look at the cylinder with the rod extended we have a cylinder full of fluid and a 1" x 18" rod on the outside. If we then retract the rod we have a cylinder full of fluid minus 1" x 18". Any way you look at it when you put a 1" x 18" rod into a cylinder you are going to replace 1" x 18" worth of fluid. Here is a picture of a cylinder. As you can see when that rod goes out or in it represents diameter of cylinder x length in volume. Front End Loader Cylinders, hydraulic cylinder, hydraulic cylinders, loader cylinder, loader cylinders

 

[clemsonfor]

I do understand what he is saying, I just disagree. I will try another explanation and see if it makes any more sense. If we look at the cylinder with the rod extended we have a cylinder full of fluid and a 1" x 18" rod on the outside. If we then retract the rod we have a cylinder full of fluid minus 1" x 18". Any way you look at it when you put a 1" x 18" rod into a cylinder you are going to replace 1" x 18" worth of fluid. Here is a picture of a cylinder. As you can see when that rod goes out or in it represents diameter of cylinder x length in volume. Front End Loader Cylinders, hydraulic cylinder, hydraulic cylinders, loader cylinder, loader cylinders

Ahh yes i see your point. Fully retracted you will have Less fluid in the resivoir equal to the volume of the rod in each of the rods in each retracted cylinder. When the cylinders compress you should have more volume by the same amout of rod that is now inside the cylinder versus outside the cylinder.

 

[Gary Sweat]

I do understand what he is saying, I just disagree. I will try another explanation and see if it makes any more sense. If we look at the cylinder with the rod extended we have a cylinder full of fluid and a 1" x 18" rod on the outside. If we then retract the rod we have a cylinder full of fluid minus 1" x 18". Any way you look at it when you put a 1" x 18" rod into a cylinder you are going to replace 1" x 18" worth of fluid. Here is a picture of a cylinder. As you can see when that rod goes out or in it represents diameter of cylinder x length in volume. Front End Loader Cylinders, hydraulic cylinder, hydraulic cylinders, loader cylinder, loader cylinders

I better understand your statement now. My statement was based taking into account the size of the tank or in this case the transmission. How much oil will it take to raise the oil level another inch in the transmission? A gallon over a large enough area won't raise the oil level very much. My loader took just under a gallon extra to bring it back up to the full level once the system was full. The difference in the oil level in my transmission extended or retracted is about 1/2". No where near the level that could cause problems.

If the transmission were filled to the top then it would be a problem.

 

[kjung17]

It's true. There is a displacement differential between extended and retracted equal to the displacement of the rod shaft. On the other hand, that amount of oil is relatively meaningless.

 

[winston1]

I also agree with you that the amount of fluid difference shouldn't cause a problem. Just saying I sort of check my level both ways and when I take my loader off which is frequent my level is normally a little over the full mark as the cylinders are retracted when I unhook. I think we are all on the same page or at least close to the same page. :thumbsup:

 

[Gary Sweat]

I also agree with you that the amount of fluid difference shouldn't cause a problem. Just saying I sort of check my level both ways and when I take my loader off which is frequent my level is normally a little over the full mark as the cylinders are retracted when I unhook. I think we are all on the same page or at least close to the same page. :thumbsup:

I'm more guilty of forgetting to check the transmission oil level. On average it's probably once a year that I remember and that's only because I change it every winter just in case it gets water in it. A little over full is likely a good thing for me.

Let's go get a beer

 

[Gary Sweat]

Appears over filling on my tractor is not a good thing after all. I noticed a couple of days ago that the brakes weren't working all that well. Took more pressure to stop the tractor than usual. Got around to pulling the brake covers today and found both sides were filling up with transmission oil.

So I held the dipstick against the side of the transmission to see just where the normal level would be on the brake shaft coming out of the gear case and guess what, it is at the bottom of the shaft. Appears when I filled it to the top of the shaft (about 3/4" over full) it caused the shaft to start pulling oil through the seal when it spins. Up till now the brake housing has always been dry and even a little rusty. Now it's nice and oiled up! I guess these type of seals work ok to keep out a little splash oil but not submerged.

Figured now would be a good as time as any to replace all the bearings, seals and hardware.