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15.2 THE CRANKSHAFT
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 7516 the angle between the handles on the gearbox should be 60 degrees.
15.2.1 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 through 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 is 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.
15.2.2. REPLACEMENT OF A CRANK WITH BEARING
Replacing a crank is necessary when it is cracked or when the big end nuts start to come loose on a
regular base. Either the crank bearing, the crank bearing fitting or the big end pin holes in the crank
are damaged. Replace the crank / bearing as soon as possible, to avoid any more damage to other
parts, as follows:
1. Remove big end pin nuts IV (or II) from both big end pins connected to the crank.
2. Remove the big end pins, so that the big end can be swopped away. (Note; this will not happen
with the big end (pin) aside the gearbox.).
3. Remove the crank bearing covers III
4. Tap crank IV and bearing carefully sidewards out of the frame by hitting the crank in the center
with a hammer.
5. Remove the bearing carefully from the crank.
6. After replacing the crank and/or bearing, replace the parts in the same sequence as they were
removed. Use loctite were indicated in fig.8.
7. If the crankshaft runs tight, see 15.2.3.
15.2.3 REMOVING THE CRANKSHAFT TENSION
If parts have been replaced on the crankshaft, the crankshaft may seem running tight. This is because
of possible tension in the crankshaft parts. It is necessary to remove these, as follows ,see fig.9.:
1. Tap the center of the crank adjacent to the gearbox, alternately left and right.
2. Feel whether the crank moves and continue till the crank has nested.
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