transmission overfilling ?

[careyo63]

my wife is a nurse so i get these and a supply of latex gloves for keeping hands clean[/QUOTE]

Welcome Motored. seen your other post also You Poor Guy:laughing: My mother retired as a Charge Nurse or Head Nurse since back in the Sixties. And the Med. Syringe not me you never know were it may have been :ashamed::laughing:

Joking I have one also.

Carey

 

[jbm614]

Those large syringes work well for changing power steering fluid in you'r vehicles as well...

 

[MJPetersen]

1/2 inch or even an inch is not something to worry about. The trans level is a minimum level. I know that those with a FEL or other large hyd users deliberately overfill so that they are assured of at least a minimum when cylinders are extended.

Mike

 

[Gary Sweat]

Manual transmissions usually run the oil at about half the main gear diameter for a couple of reasons. 1) the gears will throw oil up into other parts such as the shifter linkage and bearings higher up in the case and 2) the oil seals are not designed for pressure. They are designed to keep small amounts of oil from leaking out that creeps down the shaft.

Too much oil can cause some seals to leak and prevent other parts from getting lubricated. Slight overfilling won't cause problems but if you fill it above the gears you could eventually have problems.

The slow speeds at which tractor gears rotate would probably never be an issue even if you overfilled it by quite a bit but you may see some seals start to seep.

 

[winston1]

I measured my loader cylinders. Curl cylinders are 1" rods with about a 14" stroke, lift cylinders are 1" by about 18" stroke. If my math is correct that could amount to 3.4 quarts. I check mine with cylinders extended and allow the fluid to be a little low trying to have a balance on not being way over full when cylinders are retracted. It would be very doubtful I would ever run for extended time with all cylinders fully extended.

 

[Gary Sweat]

I measured my loader cylinders. Curl cylinders are 1" rods with about a 14" stroke, lift cylinders are 1" by about 18" stroke. If my math is correct that could amount to 3.4 quarts. I check mine with cylinders extended and allow the fluid to be a little low trying to have a balance on not being way over full when cylinders are retracted. It would be very doubtful I would ever run for extended time with all cylinders fully extended.

I would think it would make no difference whether the rams are extended or retracted once all of the air is purged from the system. The same amount of oil will remain in the system either way. What goes out one side will be comming in on the other side. There will be a small amount more needed for the piston side of the cylinders vs the ram side but not much.

I don't see any difference on my dipstick with the rams extended or retracted.

 

[winston1]

Gary, look at it this way, if you have a cylinder full of fluid and push a 1" rod into it 18" that is going to displace 1" x 18" of fluid. That 1" x 18" of fluid goes back into the transmission.

 

[Gary Sweat]

Gary, look at it this way, if you have a cylinder full of fluid and push a 1" rod into it 18" that is going to displace 1" x 18" of fluid. That 1" x 18" of fluid goes back into the transmission.

True, but also the other side of the cylinder is filled by the pump at the same time and that came from the transmission. What goes out also comes back in. More or less.

 

[winston1]

True, but also the other side of the cylinder is filled by the pump at the same time and that came from the transmission. What goes out also comes back in. More or less.

No more, no less, 1" x 18" worth of fluid is displaced.

 

[clemsonfor]

No more, no less, 1" x 18" worth of fluid is displaced.

I dont think you understand what he is saying. I too think your not seeing this the correct way.

As a hydraulic cylinder is conpressed fluid will leave that compression side and flow to the resivoir, but to get it to compress fluind is being pumped in the back side of the piston just as fast as its leaving that side its compressing. This is assuming no air in a system, which unless just replaced a line or something there should be none.

Lets just say that 2 quarts is displaced by that piston compressing that same 2 quarts will not fill the resivoir 2 quarts higher than the current level as 2 quarts need to fill the area that the piston has traveled from on the back side of that piston. This is afterall what makes it compress, the fluid on the back side under pressure and the compressed side not.