HRO(F), HRA, HRB Helical Gear Reducers0 pages

SPEC SHEET 109-001
Section:t109
Effective:t September 2011
Replaces:t July 2006
HRO(F), HRA, HRB
Helical Gear Reducers
Design
Blackmer helical gear reducers are designed for use
with 1750, 1150, 1450, and 950 rpm motors up to
30 hp. A full range of standard reduction ratios are
available from 2.24:1 to 9.08:1 to provide standard
operation speeds for Blackmer pumps as well as other
brands of positive displacement pumps.
Blackmer gear reducers are rated in accordance
with practices of ANSI/AGMA 6010. They are
manufactured in three sizes (HRO(F), HRA, and HRB)
to accommodate a variety of pump speeds for low to
high-viscosity transfer applications.
HRA – 7 ratios
Close-coupled or bracket
mounting
Close-coupled gear reduction
mounting with Blackmer GX pump
1. Ball bearing gear and shaft supports
2. Heat treated gear
3. Heat treated pinion
4. Spool for close coupling
2
1
3
4
Gear reducers are available in either close-coupled,
head-mounted configuration for Blackmer GX pump
models (allowing reducer’s shaft height to swivel
easily into alignment with driver), fixed bracket
mounted (HRO(F)), or adjustable bracket mounted
versions (HRA and HRB) for fast, accurate
alignment of pumps/reducers and prime movers.
Benefit
Blackmer gear reducers are constructed on hardened,
heat-treated, precision helical gears and pinions to
provide years of trouble-free operation. For smooth,
quiet running, the gears and pinions are immersed in
oil, while shafts are supported at both ends by large
ball bearings for added strength and reliability.
HRB - 6 ratios
Close-coupled or bracket mountings
HRO(F) - 5 ratios
Closed coupled or
bracket mounting
XL3-HR drive
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