Recall

[gary j zingle]

Steve good job on your research =

..........Backing plate had 4 bolts on '73s, 8 bolts later..............

I believe that all GMC's had 4 bolts, backing plates
to spindle/boggie arm and that the recall affected not only
the 73's but some 74's as well.

I found it interesting that some of the early coaches
had teflon boggie arm bushings! See Dealer Service
Technical Bulletin Group 4 number 75-TM-4

I suspect not many of these bushings would be left in
service as these would have been replaced long ago
by more conventional bushings.

The optional work you spoke of may have been related
to upgrading to the boggie arms using the larger bushings
or, I suspect more likely, replacing the teflon bushings.

Has anyone seen teflon bushings in these coaches?

The easiest check for the recall is the notches in the Hub
Pilot. For this inspection all that needs to be removed is
the hub cap.

My coach had the recall completed as evidenced by
the 8 notches in the Hub pilot

See Figure 1 and 17 in section 4 of the Maintenance
manual for photos of the 4 notch hub.

Regards

Gary Zingle
1973 GMC 26 foot

 

[steve canyon]

> Steve good job on your research

Thanks -- without manuals or coach it was fun.

> ..........Backing plate had 4 bolts on '73s, 8 bolts later..............
>
> I believe that all GMC's had 4 bolts, backing plates
> to spindle/boggie arm and that the recall affected not only
> the 73's but some 74's as well.

I think you're right -- I don't know if it was just a matter of '73
production carry through, or it carried through the whole '74 year.

> I found it interesting that some of the early coaches
> had teflon boggie arm bushings! See Dealer Service
> Technical Bulletin Group 4 number 75-TM-4
>
> I suspect not many of these bushings would be left in
> service as these would have been replaced long ago
> by more conventional bushings.

Thanks for the reference. I think you're right on. I was told the
bushings were Delrin, but either way, it was a probably good idea in a bad
application. An early effort to increase greasing service periods?

> The optional work you spoke of may have been related
> to upgrading to the boggie arms using the larger bushings
> or, I suspect more likely, replacing the teflon bushings.

Yes, that's my understanding too -- bronze bushings were apparently
offered as an optional upgrade.

> The easiest check for the recall is the notches in the Hub
> Pilot. For this inspection all that needs to be removed is
> the hub cap.
>
> My coach had the recall completed as evidenced by
> the 8 notches in the Hub pilot

Good point Gary! This is what got me going on this -- how best to
identify that the work had been done when looking at coaches. Of course, I
then failed to mention this method altogether... go figure.

Regards,
Steve
persona non coachibus