Recent content by Keith

Thanks for all of the info guys! The engine does not bog down or even seem to strain. I have taken the engines in and out of a few cars in my day so I'm not afraid to tackle that project. In some ways this looks easier if it was not for all of the hydraulic hoses. I think I'm going to go with...

Please bare with me, it will take a minute to get to the question. I have a 753 that I have a drive problem with. The unit does okay for about 15 minutes of operation. Then the drives start to get sluggish and eventually it won't move and just groans when you move the levers. I have replaced all...

Skidboy and Taza - Thanks for the info! I found one in-line filter. It did not look real bad but looked a lot better after it was cleaned. I replaced the hydraulic filter and draind out the hydraulic fluid. I'm going to try filling it back up with 10w-30 which the manual says is OK. If it still...

Skidboy, Thanks for responding! Once the motor is removed is there a way to verify that the seals are the problem or does the motor just have to be re-built? Thanks, Keith

Tazza, Thanks for responding! I have searched hi and lo and not found any in-line filters. I have replaced the spin-on hydraulic filter (upper right hand in the engine compartment) The hydraulic schematic in the manual shows one filter in the line from the hydralic tank but there is none there...

Thanks for responding! The unit is a 753 of early 90's vintage as near as I can tell. When the unit is cold it works well. Once it warms up a little (about 5 to 10 minutes) right reverse gets very weak. Left forward and revese work and right forward works but when you try right reverse it does...

I have a 753 that I believe may have a problem with one of the replenishing valves. I have a service manual but the pictures are not good and the info on the hydorstatic pump is limited. The pump is a Danfoss M91-35916R. As near as I can tell it looks like two of the valves are on top of the...

I'm having a hard time locating the replenishing valves. The hyrostatic pump in the machine is a model M91-35916R. In the service maual on the page that shows the hyrostatic flow chart it shows the replenishing valves as being on the hyrostatic pump? When I look at the parts book it does not...

Jeff, Thanks for the reply! I do have a manual that I purchased off ebay. Of course it covers a wide range of serial numbers so I have learned that I have to verify that the book and the machine match. Sometimes they do ....sometimes not. According to the book it looks like it has two case drain...

I have a 1993 Bobcat 753 that I just purchased. The unit operates properly for the first ten minutes or so. Once it warms up the right motor does not want to drive in reverse. It will go forward fine and the left motor cotinues to function in forward or reverse. Since it works OK for the first...