YANMAR CLUTCH REPLACEMENT
INTERVAL - AS NEEDED
TIME REQUIRED -4 TO 8 HOURS
One of the most complicated basic maintenance issues
you will run into on any compact tractor is a clutch replacement.
Just like in your car, clutches in a tractor do not last forever.
This job is a 5 star job because of the many steps and some special
tools that you will need to buy or rent. It is not a complicated
job but it will take some time. If you do not want to tackle this
job yourself, and local mechanic can do the job for you.
The job itself is really straight forward. You will
split the tractor at the bell-housing. This is the "bell"
shaped housing immediately behind the engine. The time consuming
part of this job will be removing all of the hoses, wires, and linkages
that connect the two sections of the tractor. you will need to remove
all hoses, linkages, wires, etc before you start. The tractor will
actually need to be in 2 separate pieces when you are done.
You will need a jack under the front and rear end
of the split. Determine what end will be the heaviest and put your
jack under that end. One end will need to be able to roll away from
the other so a "cherry picker" or even a rolling floor
jack is a must.
Remove the bolts at the bell housing after the tractor
is fully supported. If your jack is at the wrong end, the tractor
halves will flop over! BAD NEWS! Be careful.
Once the bolts are out- this is the scary part- the
tractor should slide apart fairly easy. You might need to remove
the drive shaft on 4wd tractor to allow the tractor to split.
Roll the 2 halves apart. You will see, on the engine
side, the pressure plate. It will be the piece with the many "fingers"
on the inside. The pressure plate is held on by the bolts surrounding
it. Remove these and the plate will fall off. Remove the disc as
well (if it did not fall off with the plate). The throw out bearing
will be on the transmission side and will slide off of the main
shaft with its carrier. The throw out bearing will usually slide
off of the carrier with a little persuasion from a hammer or press.
Check the pilot bushing and replace if necessary.
Check the clutch input shaft for damaged or sharp
splines. Do not remove it unless you are going to replace it.
Replace shaft if splines are wore or damaged.
ALWAYS REPLACE THE THROW
OUT BEARING WHEN YOU REPLACE THE CLUTCH DISC!!!! You dont want to
have to do this again in a few months!
Re-install the throw out bearing
onto the carrier just like it came off. You may need to use a vice
or press to get it back on.
Put a small amount of grease
on the pilot bushing to make it easier to get together.
You may need to rent a lineup tool from a local parts
shop to get the components lined up for reinstallation. The splines
and pilot bushing must be EXACTLY lined up or the halves will not
go back together. Slide the disc over the lineup tool and slide
the tool into the pilot bushing. Slide the pressure plate over the
tool and hold the tool exactly parallel with the frame of the tractor.
Tighten down the pressure plate bolts. This will hold the clutch
into position. Remove the tool and slide the 2 halves of the tractor
together again. It will take a lit of fiddling to get the shaft
perfectly lined up in the splines and the pilot bushing. When it
is all lined up, it will glide in as smooth as glass. NEVER TRY
TO FORCE THE HAVES TOGETHER BY DRAWING THE BELL HOUSING BOLTS IN!!!
You may think that it will never go together but it will.
BE SURE TO CHECK OUT OUR SPONSORS FOR REPLACEMENT
YANMAR CLUTCHES, PRESSURE PLATES, PILOT BUSHINGS,
THROW OUT BEARINGS, ETC.
Copyright TMS 2004. All rights reserved.
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