TM11-6125-256-34
(3) Use a base adapter to support the dc and ac end
(9) Slide armature assembly (77) into housing,
bell assemblies (66 and 67), position one slinger (64), and
engage spline, and attach dc end bell with screws (68),
then press new ball bearings (65) into the bearing liners
lock washers (69), and washers (70)
with a bearing pusher Position remaining slingers (64)
and install bearing retainer (60)
(10) Using a suitable hock, lift dc brush springs and
install two contact dc electrical brushes (9) in each brush
(4) Clean the internal splines of armature assembly
holder Connect wiring
(77) and rotor assembly (78) and lubricate with Eclipse
(11) Install fans (55 and 56)
No 31 spline lubricant (available from The Bendix
Corporation, Navigation & Control Group Teterboro,
NJ), or equivalent
(12) Install fan covers (1)
(5) Install armature assembly (77) through ball
bearing (65) and slinger (64) in ac end bell assembly (66)
(13) Guide housing leads through holes in control
box assembly (50 or 50A). Align the control
(6) Install rotor assembly (78) through ball bearing
box assembly and secure in place. Connect
(65) and slinger (64) in ac end bell assembly (67)
wiring.
(7) Install spline (76) into rotor assembly (78) Slide
(14) Install voltage and frequency regulator
the rotor assembly into housing and attach ac end bell
assembly (21) as described in paragraph 3-11b or 3-14b
with screws (68), lock washers (69), and washers (70)
as applicable.
(8) Using a suitable hook, lift ac brush arms and
(15) Install all covers after all tests of SECTION VI
have been successfully performed
install ac brush assemblies (12) Connect wiring
Section VII. GENERAL SUPPORT TEST PROCEDURE
e Reconnect all components and leads
4-24. General
Motor-generators that pass the test procedures given in
this section may be considered accetable for return to
Use the test setup outlined in the Direct Support brush
run-in (See fig 3-4)
service
Operate the motor-generator with a 115-volt ac 400-Hz
Perform the dielectric test as follows
output Check that the phase rotation is A-B-C
a Disconnect the leads to capacitors C7 and C8
4-28. Brush Run-In
a Using the voltage and frequency regulator assembly
b Disconnect stator T4G lead, the negative brush box
to control voltage at 115 volts ac and frequency at 400 Hz
lead, and the negative input lead from ground
and the set-up shown in figure 3-4 operate the motor-
generator in accordance with the brush run-in load
c Apply 250 volts ac 60 Hz between the dc positive
schedule given in table 4-6
input terminal and ground for one minute
