Check your Driveshaft phasing on FMTVs!!

oboyjohn

Active member
331
55
28
Location
Quebec , Canada
Seen this many times up here in Canada. One group of guys working on a HLVW 10 ton couldn't figure out why the T/case was wobbling back and forth. I took a quick look and the main drive shaft to the first rear axle was out of phase by a few spline teeth.
 

eric67camino

Well-known member
Steel Soldiers Supporter
271
327
63
Location
Kansas
Forgive my ignorance, as im not familiar with these trucks, but do they not have a keyed spline? On the driveshafts I've had apart (1 ton and down) there is usually a wide spline that fits a matching space in the other half.
 

oboyjohn

Active member
331
55
28
Location
Quebec , Canada
Hi Eric.
No, they do not have a keyed or master spline. Quite often I have seen them out by 90 degrees, but not too often by a few spline teeth. I learned early in my career to ALWAYS mark a drive shaft before taking it apart. If not, not only will it be out of phase but also out of balance, which will destroy a drive shaft in short order.
 

eric67camino

Well-known member
Steel Soldiers Supporter
271
327
63
Location
Kansas
Hi Eric.
No, they do not have a keyed or master spline. Quite often I have seen them out by 90 degrees, but not too often by a few spline teeth. I learned early in my career to ALWAYS mark a drive shaft before taking it apart. If not, not only will it be out of phase but also out of balance, which will destroy a drive shaft in short order.
Ok. Seems odd that they aren't keyed. I've always marked my driveshafts, as well. Just because.
 
Top
AdBlock Detected

We get it, advertisements are annoying!

Sure, ad-blocking software does a great job at blocking ads, but it also blocks useful features of our website like our supporting vendors. Their ads help keep Steel Soldiers going. Please consider disabling your ad blockers for the site. Thanks!

I've Disabled AdBlock
No Thanks