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#1
21-02-20, 17:54
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Allison
Although I am not familiar with this particular model of Allison trans if the output speed sensor signal is lost the trans will not upshift. The on road trans also uses this signal for the speedometer. Also metal particles may be present on the sensor itself, causing a poor signal. If the sensor is accessible you may be able to test it with a multimeter and see if there is a voltage signal when moving.
Paul 
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#2
22-02-20, 01:18
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TLAV bulletins
There are TLAVs in CF service. How about asking the Fleet Manager for a copy of the technical bulletins issued for NSN 1234-21-asdfa-afafds between date 1 and date 2?
If there is reluctance to share collegially, for $5 any Canadian can do an Access to Information request based on exactly those selection criteria.
__________________
Terry Warner - 74-????? M151A2 - 70-08876 M38A1 - 53-71233 M100CDN trailer Beware! The Green Disease walks among us!
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#3
22-02-20, 05:07
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Thank you, Robin. As you know, I have been contacted by one of your contacts who may be able to help.
Malcolm
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#4
22-02-20, 05:19
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Good info , Paul. Thanks. It would be easier to find the diagnostic port and borrow a scanner to monitor the speed sensor and look for codes, but if that doesn't pan out, we'll need to track down the speed sensor and I have an automotive oscilloscope we can use to check it out.
We'll check if the speedo has quit also. One of the mechanics working here just told me his shop has a scanner for road-going Allison trannies. The TLAV has a specific military model of transmission but if it has the round 9-pin diagnostic port, we may be able to at least read the codes. Malcolm Last edited by Malcolm Towrie; 22-02-20 at 05:28.
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#5
22-02-20, 05:26
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Thanks, Terry. There are people here trying to get a manual. We just got the TLAV a couple of weeks ago, so we'll see how they get on.
This is quite a modern, sophisticated transmission, released in 1999. Maybe the documentation is still restricted? Malcolm
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#6
27-02-20, 22:34
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Tried to get documentation for ours and everything of any use is not-for-release as per the red-indicated stuff att'd.
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#7
28-02-20, 20:29
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Thanks, aide. That's what I've been finding. But we've got some leads.
Malcolm
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