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2.4.2.4 Gearbox
The gearbox is cast aluminum and machine finished. The gearbox can be mounted in any one of
six positions. Refer to FSG–MNL–00185 (Parts Manual For Hale Single Stage Booster Pumps),
paragraph 2.1, (Gearbox Illustrated Breakdowns) for a reference to the appropriate drawing and
sheet number providing the views of the gearbox positions available.
Inside the gearbox a gear set transfers engine power from the input shaft, made of heat treated
nickel steel, to the pump shaft to turn the impeller at the appropriated speeds, which are deter-
mined by the gear ratio of the gear set selected. Hale offers a variety of pump gear ratios to ac-
commodate a wide range of end-user and apparatus manufacturer requirements based on the
pump's intended use, horsepower and speed rating of the engine, or the torque rating of the
transmission PTO. Refer to FSG–MNL–00185 (Parts Manual For Hale Single Stage Booster
Pumps), paragraph 2.1, (Gearbox Illustrated Breakdowns) for a reference to the appropriate
drawing and sheet number providing the gear ratio listings available.
2.5. Pump Drives
The Hale Flex Series pumps support the common types of booster pump drives used on fire-
fighting apparatus:
• The most common drive is the PTO mounted on the truck transmission or four-wheel drive
transfer case, which allows for pump and roll operation.
• Direct engine mounting via SAE#3 (or #4) flywheel housing.
Hale booster pumps are built to produce the volumes and pressures shown on their respective
performance curves and specifications (see paragraph 2.3, Pump Specifications And Number-
ing). However, the volumes and pressures safely obtainable are dependent on the torque capaci-
ty of the apparatus transmission or transfer case, power takeoff and the pump drive line. In most
cases, the torque rating of the PTO determines maximum pump performance.
The apparatus builder can provide various pump performance spots that will define the torque
limit of the PTO in terms of gpm and psi. When pumping continuously, care should be taken not
to overheat the PTO, transmission or transfer case.
Hale booster pumps are available for either engine rotation or opposite engine rotation PTO op-
eration. Since some PTOs match engine rotation and some turn opposite of the engine rotation,
each pump model can be built to match the rotation of the PTO.
NOTE
Please refer to Hale Bulletin #886 and F–72 (Hale Torque Limit Chart) for further as-
sistance in selecting the correct Flex series booster pump PTO.
Hale booster pumps are also available with an adapter that allows direct engine mount. Figure 5
shows the available flywheel housing (SAE #3 or #4) with the gearbox in the inverted configura-
tion and the volute in the up configuration.
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