Cruise Control - 1990 WB 40 -- Buzzy's Question and Answer Forum

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Subject: Cruise Control - 1990 WB 40

Author:
Sandy

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Date Posted: 02/ 27/ 03, 6:28am

Has anyone experienced this problem?
When the cruise control is engaged the transmission downshifts to
the next lower gear? This happens at any speed below the down-shift
lock-out speed of 63mph. Obviously, this makes it impossible to use
the cruise control at any speed below 63 mph.

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Replies:

[> Subject:

Re: Cruise Control - 1990 WB 40

Author:
Jay Darst
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Date Posted: 07/ 6/ 03, 5:12pm

I didn't see the answer to your cruise control problem. I too, am having some cruise control issues. I have a 1985 PT40 w/6V92 5SPD Allison. Cruise control is a Bendix. Some days, I set the cruise then in moments it releases. I can press resume, and it will reset- momentarily. Then it releases. Other days, works great. Any suggestions?

Thanks
Jay Darst

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[> [> Subject: Re: Cruise Control - 1990 WB 40

Author:
Harvey Lawrence
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Date Posted: 07/ 12/ 03, 11:14am

I had a similar problem with a Bendix control on my 1984 PT40.. I found that it was not in the cruise control but found I had an alternator going bad every time the voltage dropped below a certain level the cruise control brain quit, knocking out the cruise. This may or may not apply to your unit but check voltages just for the fun of it
Harvey Lawrence

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