TM11-6125-256-34
GENERAL
SUPPORT
MAINTENANCE
INSTRUCTIONS
4-2. Maintenance Guidance
Refer to paragraph 3-2 for an outline of the maintenance
The maintenance instructions in this chapter suplement
the Direct Support Maintenance procedures outlined in
chapter 3 and the organizational maintenance
Tools and Test Equipment
procedures in Tm 11-6125-256-20 The troubleshooting
Tools and test equipment needed for general support
which begins at these levels is expanded here to include
maintenance of the motor-generator are listed in section
actual repair of the motor-generator by replacement of
III of appendix C (Maintenance Allocation) in Tm
defective parts Except for the armature all repair parts
11-6125-256-20
are available to General Support
(2) Repeat step (1) for terminals B and D
(3) Repeat step (1) for terminals C and F
regulator assemblies and subsequent
(4) Check that the measurements of steps (1)
sections III and III.I of this chapter.
through (3) are between 0 1413 and 0 1627 ohm and that
b Troubleshooting of
motor generator and
control
they are within 2 percent of each other
box assembly components consists of the dielectric test
given in paragraph 4-25 and the resistance tests given in
paragraph 4-5
4-5. Resistance Measurements
(1) Remove the ac brush access cover and the ac
With all power off make resistance measurements as
fan end cover
follows (fig 4-1 or 4-2.1)
(2) Disconnect the lead at the No 2 slip ring
NOTE
lead and terminal 2 of the regulator connection board
All values given are applicable at 68F (20C)
(4) Measure the resistance across the slip rings
Resistance must be between 2 61 and 3 19 ohms
NOTE
a Generator Stator
It is not necessary to reconnect the lead at the
No 2 slip ring since further disassembly is
(1) Measure resistance from terminal A to terminal
required
G