Hale SMR - Manual (Page 126)

Installation
7-2 Stainless Max Series Pumps
These problems include: drive shaft failure, loosened drive ends on
pump gearboxes, broken mounting brackets, driveline joint or slider
wear, bearing wear on pumps or rear axles, and vibrations at specific
road speeds. While the incidence of these problems is low, they are
expensive to fix yet easy to avoid.
It is critical to use computer driveline analysis software, such as Dana’s
“The Expert,” during driveline layout. Dana’s software is available free
on the World Wide Web at:
http://www2.dana.com/expert.
While using the software, make sure to perform three separate driveline
analyses:
❑ Front drive shaft assembly
❑ Rear drive shaft assembly
❑ Total system
This ensures individual shaft cancellation and correct phasing.
When performing calculations, strive to achieve the lowest driveline
torsional and inertial vibrations, making sure to avoid severe driveline
angles. Be conservative and always err on the side of SAFETY. Al-
ways measure the drive shaft after construction to make sure it matches
the computer design.
Remember the following points while designing a driveline:
❑ Problems can occur with or without noticeable vibration.
❑ Suspension travel and torque wrap-up can change a marginal
driveline into one that is unacceptable.
Always consider the full movement of the driveline.
❑ Center your driveline sliders and ensure they have sufficient travel
to allow for the entire movement of the suspension.
❑ Do not measure driveline angles using a bubble protractor. Instead,
use a digital inclinometer.
Remember to zero the inclinometer on the truck frame, not the
ground.
❑ Spilt-shaft drivelines inherently have yoke phasing that can change
with every shift. This is one reason to design the other aspects of
the driveline more conservatively than a "non-split shaft" truck
driveline.
Long drivelines can lead to component vibration or failure. As the
driveline approaches half critical speed, a vibration will occur that can
damage driveline components.