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Technical Bulletin on PTO Mounted Fire Pump Drivelines
Great care must be taken in the layout of pump drivelines. Interference and driveline
vibration must be considered. An experienced installer with knowledge of driveline
considerations, proper layout and recommended guidelines should be utilized as well as
proper CAD systems for driveline layouts. Installation of the driveline should not occur until
a proper analysis is performed by either a qualified driveline specialist or W.S.
Darley. W.S. Darley utilizes, can distribute and can train qualified individuals to use the
Allison Multiple Joint Driveline Analysis program.
W.S. Darley requires that Power Take Off (PTO) driven pumps have at most 500 radians
2
per second
torsional vibration and at most 1000 radians per second
vibration, as calculated by the Allison Multiple Joint Driveline Analysis program, for a
completed driveline installation. A completed driveline installation includes the entire multi-
driveshaft assembly from the power source of the PTO output flange to the input flange of
the PTO driven pump.
Failure to design and analyze a proper driveline layout could result in severe injury and
damage to equipment, including but not limited to: the water pump, the water pump
transmission, drive tubes, hanger bearings, u-joint crosses, gears, the rear differential, and
the main truck transmission.
Questions can also be directed to our Customer Service Department at
Notice: The information presented in this technical bulletin was current as of the date listed:
W.S. Darley & Co. reserves the right to update, change, or eliminate, this bulletin at any time.
Pump Division
1051 Palmer St.
Chippewa Falls, WI 54729
715-726-2650
1202520
FEB, 25 2016
800-634-7812 or 715-726-2650.
2
inertial drive torsional
2/25/16
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