M109 Self propelled gun info needed

[jdmcm]

Thanks Paul..I'm on it!

John

[Paul Singleton]

http://automotiveenginemechanics.tpu...34-35_30_1.jpg

This might answer a few questions, and create a few more. More here:

http://automotiveenginemechanics.tpu...9-2520-234-35/

[David Herbert]

Pinching this from Paul's post #22 : http://automotiveenginemechanics.tpu...34-35_30_1.jpg

That drawing is clearly marked up as if the whole pack is at the rear of the vehicle driving rear sprockets. M109s, M107 / M110 are front engine / drive so what vehicle is that instalation from ?

Does anyone have a list of vehicles this power pack fitted ?

David

[Paul Singleton]

I have been looking through the manual and it does state that this powertrain is front mounted. Also in the introduction is a picture of the transmission with drive flanges as in Rob’s post. It would seem that this power unit may have been used in more than one type of vehicle.

http://automotiveenginemechanics.tpu...-2520-238-34P/

[Paul Singleton]

Also found this,

https://www.forecastinternational.co...fm?ARC_ID=1147

http://www.tecmotiv.com/tecmotiv/m109_support/

[Malcolm Towrie]

John,
This looks like what you have. It shows the steering, selector, and brake shafts also.

Like the M113, the flange shown for the inboard u-joint will probably slide on the splines into the transmission to give clearance for u-joint removal.

Perhaps the threaded outside diameter on the splined output sleeves in your tranny is for an oil seal holder to seal the flange hub.

Malcolm

M109 transmission.JPG

[rob love]

Originally Posted by Malcolm Towrie

Like the M113, the flange shown for the inboard u-joint will probably slide on the splines into the transmission to give clearance for u-joint removal.
Attachment 101864

The output flanges for the xmsn are secured in place with a bolt and washer, as shown in some of the diagrams I posted. More likely are that the flanges in the final drives will slide in and out as required.

[jdmcm]

Went on Ebay and there were these parts for sale, looks exactly like the output flanges on my transmission now

s-l500.jpg

s-l64.jpg

IMG_20171004_142024_hdr (2).jpg

[Paul Singleton]

From the picture that I posted it looks like a planetary reduction unit attaches to the transmission on each side.

[jdmcm]

From those pictures Paul provided it seems like the final drives slide direct into the transmission, but they must have some kind of a coupler that would allow transmission removal without having to de-track both sides and remove both final drives...there must be a coupler like Rob indicated between the two or maintenance would be a nightmare...Rob actually has M109's he maintains so I am sure he can clear this up! No pressure Rob!

[rob love]

So many questions. Unfortunately our M109 is tarped right now, but I can foresee having to un-tarp it and opening up the front covers. We also have a spare pack (takeout from a monument) that will answer the questions about the flanges, but it is out back and wrapped up tighter than a drum.

We have more than a regiments worth of manuals here on the M109 and the ARV. Unfortunately, most of the pictures are line drawings. One manual that is sitting before me now, TM 9-2350-311-20-1 has some good line drawings of the various systems. The manual is online if you google that TM number. Here is a photo of the complete steering for instance from page 9-17.

[rob love]

Here is a photo from p 10-46 of the same manual showing the flanges and U-joints. Perhaps the photo Paul shows was from a different application. There is no planetary on this output setup.