Brush Holder Assembly - Piper Navajo PA-31 Service Manual

PIPER NAVAJO SERVICE MANUAL
358 B 358 A
JUMPER LEAD RHEOSTAT
GRD.
·
VOLTMETER
DELCOTRON
Figure 11-9. Brush Holder Assembly
of the housing towards the inside.
Figure 11-10. Alternator Output Check
To install a new bearing, place a flat plate over the bearing and press in
from the outside towards the inside of the frame until the bearing is flush with
the outside of the end frame. Support the inside of the frame with a hollow cyl-
inder to prevent breakage of the end frame. Use extreme care to avoid mis-
alignment or otherwise placing undue stress on the bearing.
Saturate the felt seal with S. A. E. 20 oil, and then reassemble the felt seal
and steel retainer.
11-16. BRUSH REPLACEMENT. When the slip ring end frame assembly is sep-
arated from the rotor and drive end frame assembly, the brushes will fall down
onto the shaft and come in contact with the lubricant. If the brushes are to be
re-used, they must be thoroughly cleaned with a soft dry cloth. Also, the shaft
must be thoroughly cleaned before reassembly.
The brush springs should be inspected for any evidence of damage or cor-
rosion. If there is any doubt as to the condition of the brush springs, they should
be replaced.
To install new brushes, remove the brush holder assembly from the end
frame by detaching
the two brush holder assembly screws. Install the springs
and brushes into the brush holder, and insert a straight wire or pin into the holes
at the bottom of the holder to retain the brushes. (Refer to Figure 11-9. ) Then
attach the brush holder assembly onto the end frame, noting carefully
the proper
stack-up of parts as shown in Figure 11-9. Allow the straight wire to protrude
through the hole in the end frame.
Reissued: 10/12/79
Effectivity
DELCO
ELECTRICAL SYSTEM
4B6