Owners Manual • Rexnord
®
Planetgear
™
7000 Speed Reducers
(Page 2 of 33)
Size Mercury/Mars
158-110
10/21 (Supersedes 01/15)
© Rexnord Corporation. All Rights Reserved.
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The following instructions apply to Mercury and Mars
Planetgear
TM
7000 Speed Reducers. To assure long life
and performance of the Planetgear 7000 speed reducers,
the following practices should be followed.
1.1 BASIC OPERATION AND DESIGN
The Planetgear 7000 unit is a concentric shaft speed
reducer that uses a simple planetary design, which utilizes
a sun gear as the input, a ring gear as the fixed element,
and a planetary carrier as the output. Power is transmitted
from the reducer input shaft, through a splined connection
to the input gear (sun gear) of the first reduction. The
input gear drives the planet gears, which in turn drive
the planetary carrier assembly. This carrier assembly is
then connected to the next reduction sun gear or to the
output shaft through a splined connection. Each carrier
represents a single reduction. The reducer output shaft
rotates in the same direction as the input shaft, regardless
of the number of reductions. Reference
Figure 1.2
for a
detailed representation.
All gearing has been made of a high grade alloy steel and
case hardened for maximum life. Three points of contact,
with a minimum of six gear teeth engaged allow for a
smooth transmission of power during normal operation
and under extreme spike loads. Self contained input and
output shaft assemblies use a double row of tapered roller
bearings mounted to a steel alloy shaft to provide high
overhung and thrust load capacity. This feature also keeps
all external shaft forces isolated from the gearing. Included
in both shaft assemblies are two seals with a grease
purgeable cavity between them. This design prevents
contamination from entering the gear reducer under
extreme conditions. The input shaft assembly also has
the ability to add a backstop option to eliminate reducer
counter rotation when the input driver is shut off.
1.2 SECTIONAL VIEW AND COMPONENT
IDENTIFICATION Reference Figure 1.2
1.3 NAMEPLATE INFORMATION
Note location of serial number and model number on
nameplate. When contacting the factory, have the serial
number available, as this unique number fully describes
the reducer and allows for the most efficient and accurate
exchange of information. Reference
Figure 1.3
for name
plate illustration.
Operation of the reducer shall not differ from the
application data warranted on the nameplate. Any
deviations from this data requires submission of new
application information along with all nameplate data to
the factory or service center for approval. All data changes
require a revised nameplate.
Section I — Introduction
PLANET CARRIERS
THIRD REDUCTION
MAINCASE/
RING GEAR
PLANET CARRIERS
SECOND REDUCTION
PLANET CARRIERS
FIRST REDUCTION
BACKSTOP
NAMEPLATE SIDE
OUTPUT SHAFT
(LOW SPEED)
DUAL
PURGEABLE SEALS
TAPERED
ROLLER BEARINGS
TAPERED
ROLLER BEARINGS
DUAL
PURGEABLE SEALS
INPUT SHAFT
(HIGH SPEED)
7000
planetgear
Figure 1.2 Sectional View of
a Planetgear Speed Reducer
R
Figure 1.3 Reducer Nameplate
