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6640 error code

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Wayne Henry
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Joined: 03 Nov 2012
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PostPosted: Sat Nov 03, 2012 2:53 pm    Post subject: 6640 error code Reply to specific post Reply with quote

I have a 92 ford 6640 with error code 28. Can you tell me what this is?
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Joined: 13 Dec 2000
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Location: Chester NH

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PostPosted: Sat Nov 03, 2012 4:05 pm    Post subject: Re: 6640 error code Reply to specific post Reply with quote

28 means that your hyd. system is reaching max pressure and your #2 clutch pac is not engaging. $7,000.00. Do you have a manual? You can do a self diagnostic with the on board computer to verify. My 8240 SLE was throwing a 28 more and more frequently before it finally gave up due to bad seals.

Last edited by showcrop on Sat Nov 03, 2012 4:08 pm; edited 1 time in total
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