Redexim Verti-Drain 7521 - The Crankshaft; Replacing the Transmission Oil Seal

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15.2 THE CRANKSHAFT
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In fig.9. the assembly of the crankshaft is given. Also look at the spare part page for a more clear view and
setup. On a 7521 the angle between the handles on the gearbox should be 45 degrees.
5.2.1 REPLACING THE TRANSMISSION OIL SEAL.
In fig.9. a top view of the crankshaft is given. To replace an oil seal at the transmission, handle as follows:
1. Loosen nuts II and IV, which may be tight because of the loctite. Some heat may help.
2. Remove big end V, after the big end pin VII is removed.
3. Remove cover III by unscrewing all the bolts/nuts.
4. Slide crank VI away from the gearbox using a hammer and hitting it slightly at the center, until big
end pin VII is free.
5. Rotate crank VI and slide big end IX from the big end pin VII.
6. Remove handle X after marking the position and removing nut VIII.
7. Pull oil seal out with a screw driver.
8. Clean area and assemble new oil seal.
9. Clean handle X and splined shaft and assemble the handle at the right position.
10. Before attaching nut/new lock plate, first fill the space under the locking plate (between the
splines and the handle) with liquid silicon paste.
11. Attach a new locking plate and nut VIII. Use loctite for the nut as well.
12. Assemble the other parts the same way as they have been removed.
13. If the crankshaft seems lumpish, see further 15.2.3.
Fig.9.