Aircraft Alternator
Maintenance Manual
ES1031
24-30-01
Rev. B: 20 Apr. 2022
Page: 6-9
© 2022 - Hartzell Engine Technologies - All rights reserved
A. Inspect the through bolts while installed, they must not be bent, cracked, or damaged.
B. If any through bolt is bent, cracked, damaged or housings are loose, the alternator should be replaced or
overhauled. (Loose and damaged through bolts may indicate serious internal damage in the alternator.)
C. If the through bolt(s) are not damaged in any manner but appear only to be loose, it is permissible to apply
proper torque. This may be accomplished by removing the alternator or in the aircraft as space permits.
D. Cut the safety wire or safety cable from the bolt head at the drive end of the alternator and discard. Using
a calibrated torque wrench, apply 40-45 in-lbs (5.08-5.65 Nm) torque to the loose through bolt. After
application of torque, check and apply the proper torque to the remaining through bolts. Refer to Table 6.1 for
proper torque.
E. Install new .032 stainless steel safety wire or safety cable (HET P/N RX-1961) through the drilled hole in the
through bolt head at the drive end of the alternator. Refer to section 6.14 or 6.15.
Brush Holder
Screws 2 ea.
F1 & F2 Field
Terminals
Brush
Retaining
Wire Slot
Brush Holder
Ass’y
Brush
Retaining Wire
Hole
Brush Position as Shown
Brush Ass’y
Brush
Curvature
Slip Ring
Arc
.50
Brush Retaining Wire
Brushes held
up by Brush
Retaining
Wire
Brush Holder Ass’y Delivered
with Retaining Wire Installed
Figure 6.3a - Brush Holder Locations
Figure 6.3b - Brush Holder Installation
Figure 6.3c - Brush Position in Holder
Figure 6.3d - Brush Retaining Wire
