18
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 bases. 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 the big end V.
2. Remove the handles IV.
3. Take the splined shaft with bearing out.
4. Remove bearing from splined shaft.
5. Replace the parts and assemble the other way round.
@ Use loctite for nut II, III and VIII.
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 resolve the tension, 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.
3. Repeat this operation with the adjacent crank and continue this way till the crankshaft will operate
more smoothly.
@ After any repair on the crankshaft, the crankshaft nuts should be checked regularly, see 12.0
@ Don’t assemble the cranks at the wrong side of the machine. See the spare part for the right part
numbers.
15.3 ALIGNMENT OF AN ELEMENT
.
In the event that an element is no longer in line with the adjacent elements, the alignment can be
corrected as follows (see fig.8.):
- Slacken the four bolts/nuts A, that connect the crankshaft to the element.
- Slacken the two bolts B, that fix the element to the main frame.
- Try to align the element by moving it side wards, till it aligns with the adjacent ones.
- Start to tighten all bolts/nuts.
@ The element may be pushed out of line due to overload to the machine
@ When a crank is replaced, always realign the element, so that no additional tension is created in the
total element assembly.
@ Any pre-tension in the element assembly will shorten the bearing life and may damage other parts as
well, so check regularly.
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