Hello gavin351!

A warm welcome to the ODK forums. I'm sure we can help here.

The Model 45 is, arguably, the best residential reel mower machine of its time.
It easily holds ground with many of the best made today.

You have identified a problem with the primary clutch on your 14 inch machine.
There are a number of possibilities here, some simple; some less so.

The causes could include maladjustment or misalignment , clutch pad failure, or
clutch thrust pad or bearing failures.

If you could take a close-up photo looking down at the clutch assembly that would help the
SB experts to ascertain the problem for you.

How to upload photos may be found HERE.
When you return to the site, a good place to start is 'Active Topics' from the menu bar.

Hope this helps.
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JACK.