Inspecting and Replacing Brushes in a Bodine Type 33A, 42A, and 32A motor or gearmotor. Lit P/N 07481063A. © Bodine 2007 Page 1 of 8
Inspecting and Replacing Brushes in Bodine Type
33A, 42A, and 32A (PMDC) Motors or Gearmotors
The permanent magnet DC (PMDC) motors and gearmotors manufactured by
Bodine Electric Company
are unique compared to other DC motors and
gearmotors in many ways. This is because the primary objectives in the design
of all Bodine products are
long life
,
quiet operation
, and
no lubricant leakage
.
With regard to long brush life, the Bodine type
33A, 42A, and 32A motors and gearmotors
employ a unique method of maintaining a
constant force on the brushes inside the motor.
A roll-type spring is used instead of the more
common coiled spring. The roll-type spring puts
a constant force on the brushes even as they
wear and get shorter. By contrast, the force
exerted by a coiled spring diminishes as the
brushes get shorter and the spring approaches its
uncompressed length. Reduced force on the
brushes can cause them to “hop” on the
commutator and wear faster. The roll-type
spring is a superior design.
Installing the roll-type springs correctly is
critical in order to obtain optimal performance
from your Bodine motor or gearmotor. Incorrect
installation can cause brushes to wear faster, or
ultimately could damage the product.
By following these instructions when inspecting and replacing the brushes in a
Bodine type 33A, 42A, or 32A motor or gearmotor, the user can be assured of
long brush life, and desired motor or gearmotor performance.
TOOLS NEEDED:
Large slotted
tip screwdriver
Medium size
slotted tip
screwdriver
Small
screwdriver with
any type of tip
Pair of long nose
pliers
Safety glasses
Roll-type Spring
Coiled Spring
851-628 Rev. A
