DRIVE MOTORS LEAKING

[amigosdemo]

NEED TO RESEAL THE DRIVE MOTORS BOBCAT DEALER FOUND THEM LEAKING INTO CHAIN CASE. THEY ALSO TOLD ME THAT IT NEEDED TO THE CARRIERS DONE TOO AND INSTALL A NEW DRAIN FILTER? HOW HARD IS THIS TO DO?

 

[Tazza]

PLEASE TURN OFF CAPS
We all talk in lower case, upper case is regarded as SHOUTING.
What machine? the case drain filters are easy, the carrier seals aren't too hard either. The carrier seal holds the case drain oil back from the motor, preventing it going into the chain case.
I assume the drive still has good power? just a problem of oil dissapearing into the chain case rite?

 

[amigosdemo]

PLEASE TURN OFF CAPS
We all talk in lower case, upper case is regarded as SHOUTING.
What machine? the case drain filters are easy, the carrier seals aren't too hard either. The carrier seal holds the case drain oil back from the motor, preventing it going into the chain case.
I assume the drive still has good power? just a problem of oil dissapearing into the chain case rite?

sorry . 753 i am thinking of taking off the drive motors and taking them to get rebuilt. but i dont know what the carrier seals look like or where they are locate. yes they still have good power just getting all the hydraulic leaking down to the bottom of the machine.

 

[Tazza]

sorry . 753 i am thinking of taking off the drive motors and taking them to get rebuilt. but i dont know what the carrier seals look like or where they are locate. yes they still have good power just getting all the hydraulic leaking down to the bottom of the machine.

The drive motor bolts to the carrier. With the hoses removed and the 4 bolts holding the motor to the carrier you can pull the motor out. What you see now is the shaft that drives the chains. You will also see a large seal, this is the carrier seal. This is where oil can by-pass from the motors case drain area into the chain case.
With the motors off, you can drill two small holes in the seal and screw in self tapping screws. Using pliers you can now lever the seal out. It may be tight and you may need to juggle it a bit, but it will come out. Replace the seals and you should be good to go.
There are no seals in these drive motors that will prevent oil getting into the chain case. Where the output shaft comes out, there is no seal on the motor. The seals in the motor ONLY alter operation of the motor or evternal leaks through the motor segments. If there are no leaks from here, you will be wasting your money getting them changed too, as it will not fix the chaincase leak. If your motors were down on power, yes, you may need seals.
Good luck in your repair

 

[Stephend]

The drive motor bolts to the carrier. With the hoses removed and the 4 bolts holding the motor to the carrier you can pull the motor out. What you see now is the shaft that drives the chains. You will also see a large seal, this is the carrier seal. This is where oil can by-pass from the motors case drain area into the chain case.
With the motors off, you can drill two small holes in the seal and screw in self tapping screws. Using pliers you can now lever the seal out. It may be tight and you may need to juggle it a bit, but it will come out. Replace the seals and you should be good to go.
There are no seals in these drive motors that will prevent oil getting into the chain case. Where the output shaft comes out, there is no seal on the motor. The seals in the motor ONLY alter operation of the motor or evternal leaks through the motor segments. If there are no leaks from here, you will be wasting your money getting them changed too, as it will not fix the chaincase leak. If your motors were down on power, yes, you may need seals.
Good luck in your repair

I have a 751 and just recently I noticed the chain case level increasing and I have had to add oil to the hydraulic tank. I assume based on the post that the drive motors can leak oil into the case. If I still have good power and I am not having to add very much oil, about 1 quart every 6 to 8 hours do I have a serious problem that needs to be addressed? I guess what I am asking is do I need to address the problem quickly. Thank you in advance for any information you can provide.

 

[skidsteer.ca]

I have a 751 and just recently I noticed the chain case level increasing and I have had to add oil to the hydraulic tank. I assume based on the post that the drive motors can leak oil into the case. If I still have good power and I am not having to add very much oil, about 1 quart every 6 to 8 hours do I have a serious problem that needs to be addressed? I guess what I am asking is do I need to address the problem quickly. Thank you in advance for any information you can provide.

Right away you should check your case drain hose filter(s) if fitted to a 751 to make shure they are clean. If they plug then the pressure rises and this forces more oil past the shaft seals into the chain case. Once they are cleaned you can continue to use it as long as you wish to put up with adding hydraulic oil.
If fitted with case drain filter they will be a aluminum canister in the small hose coming off the drive motors.
Ken

 

[Stephend]

Right away you should check your case drain hose filter(s) if fitted to a 751 to make shure they are clean. If they plug then the pressure rises and this forces more oil past the shaft seals into the chain case. Once they are cleaned you can continue to use it as long as you wish to put up with adding hydraulic oil.
If fitted with case drain filter they will be a aluminum canister in the small hose coming off the drive motors.
Ken

do the case filters come apart and do they have brass filter inside the aluminum canister? is the aluminum canister about 6 to 8 inches long and about 1 to 1.5 inches in diameter? Thanks again

 

[skidsteer.ca]

do the case filters come apart and do they have brass filter inside the aluminum canister? is the aluminum canister about 6 to 8 inches long and about 1 to 1.5 inches in diameter? Thanks again

"do the case filters come apart and do they have brass filter inside the aluminum canister"
Yes and Yes
They will be the only aluminum canisters you will find on a small diameter hose. Though the canister part was @ 4" long but anyway....

 

[Tazza]

"do the case filters come apart and do they have brass filter inside the aluminum canister"
Yes and Yes
They will be the only aluminum canisters you will find on a small diameter hose. Though the canister part was @ 4" long but anyway....

If you keep running it like this for a little while, on level ground, remove the front plug. This will let the excess oil drain out. If it fills too much, oil will come out of the axle seals and the breether on the chain case making a mess.
Changing the seals is not critical. If you can live with the extra oil, it won't cause any damage as long at it doesn't run dry.