Welcome to Brumleve Industries!
The great thing about a Shur-co electric system is that it gives you the option to revert back to a manual system and that's where the roll tube bearing pack comes into play. The roll tube bearing pack allows for a manual override on your 4500 system.
First, remember to release the motor from the drive shaft. Next, simply pull the pin or bolt out of the bearing pack and slide it off the spline shaft. Lastly, insert your manual crank onto the spline for manual operation.
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