New owner of an older machine.

[chapmanruss]

For the Speed Control Assembly the part that gets worn the most is the Quadrant Assembly (AKA Porkchop) Part Number 504221 and reference 86 in the parts list and diagram from the manual I previously posted. It is shown below. The Teeth are the common wear point and can cause the Speed Control to be hard to turn. It has two spring steel parts that are riveted to the Casting. If either of the two spring steel parts or the teeth are damaged the Quadrant Assembly should be replaced. This can be done by just replacing the Quadrant Assembly itself or the Speed Control Assembly shown in the second picture below.

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Quadrant Assembly PN 504221 SS pic.jpg (6.58 KiB) Viewed 19951 times

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Speed Control Assembly PN 504198 SS pic.jpg (22.47 KiB) Viewed 19951 times

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Let us know what problems you are running into and we can help you through them. Remember pictures do help a lot when describing anything.

[GetterDone]

You may also consider doing the Bill Mayo Speed Control Quadrant modification in the link below.

Link: download/file.php?id=34357

[chapmanruss]

The link to Bill Mayo's modification Dwayne posted has good information on adjusting the Speed Control Assembly even if you don't use the modification.

Unfortunately, Bill has passed.

[larryfoster]

They found my father-in-law's Owner's Manual.
That seems like i will really help.

[chapmanruss]

Glad to hear the original Owner's Manual was found. You will be able to compare it to the 520S Manual I linked to previously. That 1980's manual will have less detailed information than the more current ones do. Even though the 520S Manual has differences a lot of it is still very useful.

[larryfoster]

Thanks for pointing that out, Russ.

Due to life, I have been away for a couple days.
Hope to get back tomorrow

[larryfoster]

With great trepidation, I got the speed changer out.
The set screw was tough.

I get nervous because I'm good at tearing stuff apart and not always good at putting back together.

[dusty]

While tearomg amd reassembling, don't forget that your cellphone camera can ve a valuable tool.

[larryfoster]

It appears the teeth on the speed control quadrant were chewed up.
I ordered one from Shopsmith.
Hope they ship faster than DR power does.

Can I take a small triangular file and straighten them out some to run the machine and do the rest of my clean up and tune up or should I just be patient and wait?

[DLB]

It appears the teeth on the speed control quadrant were chewed up.
I ordered one from Shopsmith.
Hope they ship faster than DR power does.

Can I take a small triangular file and straighten them out some to run the machine and do the rest of my clean up and tune up or should I just be patient and wait?

Cleaning the quadrant (porkchop) up with a file can be done, it depends mostly on the amount of damage. Sometimes this is an indicator of other damage so I suggest looking again to the Bill Mayo document posted earlier. The quadrant needs to swing straight and true on the worm gear, it should be centered and remain centered on the worm gear throughout its travel. Look for damage or wear on the two mounts that form a bracket that the quadrant mounts to.
If either mount is bent or has been bent it will be somewhat weakened and more likely to bend again. Replacement and/or the Bill Mayo upgrade are the best options for this.
Mounting holes may be worn and oversize, allowing the porkchop to wander. This is caused by the use of a spring tension pin as a hinge pin. Once this wear starts it gets worse quickly. Replacement may be necessary, it depends on how oversize the holes are. The Bill Mayo upgrade will stop the wear if it isn't excessive.

I've seen three bad quadrants and never seen one where the quadrant was the only problem. YMMV. I've always felt that Shopsmith should publish some wear/inspection criteria for the rest of the speed control.

- David