10
Procedure 6 – Checking and
Adjusting the Tension in the
Chains
1. Check the deflection in the two
chains along their longest spans.
The two chains should never
have less than ¼” nor more than
1” deflection at their longest
spans. Since some parts of the
chain are stiffer than others, the
deflection should be checked
across the entire length of the
chain. This can be done by
rotating the crank handles in 45
°
increments and checking the
deflection of the chain between
increments.
2. If the chain needs adjusting,
loosen but do not remove the ½-
20 nut that fastens the shaft
assembly (Item 90) to the main
frame.
3. To tighten the chain, the shaft
assembly needs to be moved in
the direction of the seat. To
loosen the chain, the shaft
assembly needs to be moved
towards the brake drive pulley.
With the nut still on the shaft, use
a hammer to knock the entire
shaft assembly a few millimeters
in the prescribed direction.
4. Tighten the ½-20 nut and check
the deflection as in step 1.
5. Repeat steps 1-4 until the desired
stiffness is reached.
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