8. Service Procedures
Figure 3: The UBC crank assembly.
Chain Replacement
The Chain Replacement Procedure is actually a four-part operation that requires the user to
replace the chain, align the replacement chain, check the replacement chain for proper
tension adjustment.
Tools Required: (2) ½" Open-End Wrenches, Phillips Screwdriver, Tape Measure or Ruler,
14 mm Socket Wrench.
To replace the chain:
1. Unplug the power cord from the wall socket.
2. Remove both arm cranks (see Figure 3). To do this, remove the hex nuts at the hub
of each crank, and drive tapered pin through and discard. Replacement tapered pin
is C08602. Do not reuse tapered pin.
3. Remove both side covers with Phillips screwdriver.
4. Remove chain take-up weldment secured with bolt and ½" nut.
5. Remove chain and install replacement.
— 19 — MAINTENANCE
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