Owner's manual

42 Manual p/n: 029-0020-79-0
4DK Series Pumps
❑ 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 conserv-atively
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.
Figure 23: "Maximum Recommended Drive
Lengths," in the next column, lists the maximum
driveline length using a safety factor of 42% of
critical speed. This table is based on a 0.134”
(3.4mm) wall thickness. Although wall thickness
does not have a significant effect on drive shaft
length for this calculation, it does have some
effect.
Extremely short drive lengths between the pump
and the rear axle can also cause problems from
excessive operating angles when the suspension
articulates. Use caution and conservative design
values when utilizing air ride suspension and
short rear drivelines.
More information on fire apparatus drivelines can
be found in Hale OEM Technical Bulletin # 957.
For application assistance and approval, contact
a driveline equipment manufacturer, such as
Spicer/Dana or Merritor.
Shaft 2.0 2.5 3.0 3.5 4.0 4.5
RPM
2400 47 53 58 63 67 71
2600 45 51 55 60 64 68
2800 44 49 53 58 62 65
3000 42 47 52 56 60 63
3200 41 46 50 54 58 61
3400 39 44 48 53 56 69
3600 38 43 47 51 55 58
3800 37 42 46 50 53 56
4000 36 41 45 48 52 55
Figure 23: Maximum Recommended Driveline Lengths
Driveline tube size (diameter) in inches
PLUMBING CONNECTIONS
4DK Pump
The 4DK pump is provided with a 4” Victaulic
suction connection and a 4” Victaulic opposite-
suction-side discharge connection.
An optional 4” Victaulic suction-side discharge
connection is also available.
4DK6 Pump
The 4DK6 pump is provided with a 6” Victaulic
suction connection and a 4” Victaulic opposite-
suction-side discharge connection.
An optional 4” Victaulic suction-side discharge
connection is also available.