| Re: [GMCnet] JC-4 Vacuum Pump?? [message #323880 is a reply to message #323877] |
Thu, 14 September 2017 17:55   |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma:
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Senior Member |
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Pete Pappas, past SunShine Statesman & Dixielander, devised a way to
increase the cutoff pressure of the JC4. He sent me details at one time.
Unfortunately I can neither remember nor find the details. I do recall that
it involved adding something like a ballpoint pen spring and a small
machine screw. I never did it because I figured I'd prefer to bypass the
internal switch and add an external one -- which I never did because the
Azure pumps came along first.
Searching for that mod, I came across the link to Gene's brake postings.
Here it is for the enlightenment of newbies:
http://gmcmotorhome.info/addens.html
Ken H.
On Thu, Sep 14, 2017 at 5:30 PM, larry.whisler
wrote:
> ...
>
> Someone was looking into altering the internal switch to achieve a higher
> vacuum. I have no doubt that the JC4 pump could provide an adequate
> amount \
> of vacuum if the switch could be overridden.
>
...
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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