Disassembly and reassembly instructions, Air gap and shimming, Axial float – Rockwell Automation 1325L DC Motors, Frames C210ATZ - C440ATZ User Manual
Page 23: Anti-friction bearing assemblies, Bearing replacement
DC Motors
23
Disassembly and Reassembly
Instructions
The motor design incorporates many new techniques which are
described in this section. It is recommended that these differences be
understood thoroughly before any disassembly work is done to avoid
possible damage or harm to either machine and/or maintenance
personnel.
Air Gap And Shimming
(Frames C210ATZ - C400ATZ)
Main Pole
Steel or brass shims, when used, are placed between pole and frame.
If for any reason the shims are removed they must be replaced under
the same poles. Main pole bolts are steel SAE Grade 5 (120,000 psi).
Interpoles
Excluding the C440ATZ frame, interpoles are an integral part of the
frame and do not require nor are they capable of shimming.
Axial Float
Motors have a wave spring washer between the drive end bracket and
bearing. The commutator end bearing is positioned axially by a float
restricting inner cap. Axial float (including bearing internal
clearance) should be within the limits listed below.
Axial Float
Anti-Friction Bearing Assemblies
The bearings are positioned and secured in a machined cavity in the
end brackets. Open type ball bearings are used for direct coupled and
belt drive applications for frames C210ATZ - C250ATZ and are
protected by inner caps at both ends.
Frames UC360ATZ - C440ATZ employ a cylindrical roller bearing
on the drive end for belt drives, and a ball bearing for coupled service.
Bearing Replacement
Remove bearing by means of bearing puller. Clean bearing housing
and bearing seat prior to assembly of bearing. Place new bearing in a
bake oven for 1/2 hour at 121 degrees C (250 degrees F). Place
bearing onto shaft and push home to bearing shoulder. Hold it in
place for a minimum of 30 seconds.
After bearing has cooled down for about 1 minute, add 1/2 cu. in. of
fresh grease into back of bearing. When the motor has been
assembled, grease per instructions found on
Frame
Maximum
Minimum
C210ATZ - C440ATZ
1.29 mm (0.051 in.)
0.33 mm (0.013 in.)