Elite Veteran
  
Location: Victoria, BC. Canada | In the midst of doing my U-joints and discovered the torque specs in my copy(s) of the service manual are barely legible; however, I discovered another reference included on our wonderful Norwegian brother's website.
See: FMC Motorcoach.com/Service Bulletins/Drive Line Alignment/Page 4
If my interpretation is correct, all U-joints and the 4-yoke nuts fixing the yoke to the park-brake are torqued to 25-30 ft/lbs.
NOTE: There appears to be conflicting information on the correct torque spec for the input and output differential shafts.
In the above service bulletin reference the spec for the input shaft yoke-nut is 150 ft/lbs; that same spec can be found elsewhere in the Parts/Service manual; however, as has been discussed here recently, there is also another torque-spec reference for the pinion yoke nut and output shaft(s) yoke-nuts that specifies a 500 to 600 ft/lb. torque requirement.
See: Service Manual/Group 18/Differential/Pages: 18-8; Table 18-2, page 18-9
There may be other conflicting references that I don't have time to search for now.
I consider this to be a serious conflict of information that, unless I'm oblivious to the reason for it, has caused many people a lot of unnecessary effort, grief, and certainly in my own case - considerable expense to deal with over-torqued damaged parts. Just last week - while doing the 600-ft/lb Schwarzenegger - I managed to strip my pinion shaft which cost me a tidy $250/CAD to have it repaired.
If what I'm stating here is true, the correction should be made on the website and all coach owners should rightly be made aware of it.
Terry
#846 |
DRIVE-LINE TORQUE SPECS