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Phone: 608-365-2563 5 Fax: 608-365-2182
ABOUT YOUR NEW DURST PUMP DRIVE
The New Durst pump drives incorporate some of the
features from both the previous Terrell and Hub City
designs as well as many new and simplistic features.
The Durst pump drive now incorporates class 10 spur
gears that run on heavy duty ball bearings. Because ball
bearings do not require shimming the assembly of a pump
drive is drastically simplified. This also allows for the
bearing to be contained within the housing halves. The key
feature about this is that any adapter can be changed out
without disturbing the gears or bearings in the gear box.
This also allows for the box to be split to service gears and
bearings without having to remove the adapters.
SPLINES
The Durst pump drives have a 29T-12/24 internal spline
on the gears. This allows for a spline adapter to be used
on any SAE pump shaft. Because the pump shaft is no
longer integral with the gear, if the pump is changed or
replaced, a new gear is not required. A 29T-12/24 spline
significantly reduces wear on both the gears and spline
adapters.
OIL CIRCULATION
Extensive testing was done on each Durst pump drive gear
box to optimize the quantity of oil in each box at each ratio.
The new Durst pump drives no longer have the need
for Iso-Lube ports. Instead the Durst pump drives have
special oil port locations and oil directing ribs that causes
the oil to flow into the pump pad area, lubricating the
spline adapters and bearings without the need for external
pumps. Oil volume is critical to make this feature work and
the oil level should be checked frequently.
PUMP PADS
The Durst pump pads have been simplified and no longer
contain the bearing cup. Pump pads can now be removed
without disrupting the internal workings and alignment of
the bearings and gears inside the gear box. As mentioned
above the Durst pump pads no longer feature the Iso-Lube
ports. Oil flows into the pump pad area and then patented
cast in recesses causes the oil to flow across the spline for
wet spline operation.
INPUT SHAFT
The input shaft of the Durst pump drive is integral with the
input gear through a 29T-12/24 spline. The input shaft is
contained within the gear box and allows the drive plate or
torsional coupling to be free on the input shaft, which
reduces misalignment stresses from the engine flywheel
and the gear box. Due to the modular design of the
gear box the input shaft can be removed and/or replaced
without disturbing the internal workings of the gear box.
DRIVE PLATE
The Durst pump drive now uses a four disk drive plate.
By using 4 thin disks the drive plate becomes slightly
wider and increases the rating. Thin disks are much more
flexible and when multiple disks are put together they
absorb more engine vibrations than a single thick disk. As
mentioned in the Input Shaft section the drive plate is no
longer captured on the input shaft, instead it is able to
automatically adjust if any engine flywheel misalignment
occurs. These changes result in smoother operation and
longer gear box life.