Here's a demonstration
Oliver 55, Super 55 and Oliver 550 PTO Clutch
This job is
more time consuming than it is hard to do. The following steps will
help but I want you to know I have done a few of these but the last one was
about a year ago.
1. Drain anti-freeze from the motor and radiator. You need to do this
because you have to remove the temperature gauge probe from the motor.
If your temp., probe is broken, then you don't have to drain the
2. Remove stay arm ball sockets at the rear by removing the caps.
3. If you remove the stay arms at the front pins, you may have a fun time
putting the pins back in when re-installing them. They appear to have
twist on them and they are not fun aligning back up. Also remove the tie rod
ends at the steering gear box.
4. Remove the battery and battery
cables, the sheet metal under it (slide tray if it has one).
5. Remove the starter, throttle cable, generator wiring at the generator,
choke cable, fuel line (be sure to shut the fuel off first), sheet panel
under the fuel tank (LH side) that attaches two bolts to the gauge cowl,
rear fuel tank mounting bolts.
6. When you unbolt the sheet metal
from the cowl, you can leave the steering gear box mounted to the top
7. Raise the front of the tractor up
slightly and block up the clutch housing with suitable wood blocking.
Remove all of the bolts around the clutch housing that hold the
engine to it. Using a
suitable chain and or strap on a chain fall to lift the back of the motor
and roll it ahead, separating the tractor engine from the clutch housing.
9. After the motor is slid away
from the clutch housing, remove all of the top bolts supporting the upper
shell of the clutch housing.
Leave the steering column mounted on the upper clutch cover, no need to take
10. Now you will have to remove
the main tractor clutch fork and shaft.
Remove the three bolts securing the clutch tube and slide it off the
clutch shaft. This will make it
much easier to remove the PTO clutch pack below the tractor main clutch
11. Remove the PTO clutch fork (cast iron) and the PTO clutch shaft.
12. Removal of the clutch pack
requires the removal of a set allen set screw before the operating clutch
asy, can be removed. Sometimes I
have seen two set screws, one on top of the other, so if the unit doesn’t
slide out, make sure there isn’t a second one.
When you remove the PTO clutch assembly, the PTO clutch drum stays in
place. If you decide to replace
the seal that’s behind the clutch drum, you will have to remove a large nut
in front of the drum (observe threads on inner shaft). There is also a seal
in the end of the PTO clutch pack and this seal should be replaced.
14. To disassemble the PTO clutch pack, you will notice a large adjuster
nut. In one of the adjuster nut
slots there is an adjuster pin(spring loaded) that you must push in and hold
to unscrew the PTO adjusting nut. After you have removed the clutches you
will want to make sure the backing plate of the PTO clutch pack is not
cracked or severely burnt. Also
you will want to pay close attention the to the brass engagement collar.
If the unit has been stressed, it sometimes wears out the brass
collar shifting fingers and even destroys the collar where it goes over the
PTO clutch steel ring. On one tractor I repaired, the cast fork that shifts
the brass collar had a broken ear so inspect everything.
15. When re-assembling the PTO clutch pack, adjust the pack before you put
the top clutch housing on. It’s
much easier to do it now than when it’s all together.
Pay special attention to the disengagement travel in the clutch
lever. You can put a stop bolt ahead of the lever so when it’s disengaged,
it doesn’t put undue pressure and wear on the brass collar.
Again, do this before you put the top
clutch cover on. When adjusting
the PTO pack, you can use an I&T shop manual. You will want a good easy
snap, (poundage of pull on the PTO handle is in the manual) 16. It is also a
good time to check the main tractor clutch, throw out bearing and pilot
bearing. Often these need
Remember, our company sells the
PTO clutch disc’s and steel plates.
I hope this helps you to at least
get an idea of what your about to do.
If this is your first time, allow time that you can devote to it.
Having a friend help doesn’t hurt either and makes the whole job a
Thanks for visiting Bob’s corner
and if you have any questions or comments, please write or call.