| Author | Message | ||
     JeffFowler |
I have a 1959 770. The hydroelectric 3 pt. hitch lift master cylinder below the steering wheel with the 2 control arms is leaking into the transmission. I want to rebuilt it but can not find any information on rebuilding. The original service manual states "contact you Oliver service man," well that can't happen, any suggestions? I also have a 1960 770 that is a standard hydraulic 3 pt. hitch lift master cylinder. Does anyone know if these are interchangeable? | ||
| Chris Losey (Admin) |
The hydraulic units are interchangeable between the following models: 77, 88, Super 77, Super 88, 770, and 880. All you need to do to remove the hydraulic unit is remove the PTO drive shaft. You can do this by removing the PTO shield (if it is still there), then under the round PTO cover there are 4 bolts that hold that on. Remove them. Then remove the PTO cover, the handle will come with it, and will move forward as it disengages the forks. Then behind the PTO clutch is a bearing retainer held in with 3 bolts. Remove them. Then just pull the PTO clutch and shaft out. It may take a little prying to get it to start moving, but once the bearings are free from the housing it should slide right out. Now remove all of the bolts around the base of the hydraulic unit, where it meets the main rear end housing. Then just lift it out. It is a self-contained unit and can be worked on outside of the tractor. Chances are, your pump needs rebuilding. New seals and needle bearings are all it usually takes to fix them up. But the center section of these pumps have been know to crack, so be sure to check the entire pump for cracks and/or grooving on the end pieces. Assembly is the reverse of disassembly. |
