CHAPTER 3
ENGINE REPAIR INSTRUCTIONS
Section I. GENERATOR OR ALTERNATOR
(11) Remove six screw (3), lockwasher (4), and
3-1. General
end frame (6) from frame (13).
(12) Remove four screws (1), external toothed
The electrical energy required for operation of crane-
lockwasher (2), and end cover (5) from frame (6).
shovel lights while the engine is shut down, and the
(13) Remove four nuts (33), lockwashers (11),
starting motor, is furnished from storage batteries.
screws (29), and brush plate (12) from frame (6).
Batteries are replenished when engine is running, by a
(14) Disengage four springs (32) from brush
generator on units powered with engine model 687C-18-
plate (12), then remove brush arms (30), spacer (31),
ES, or by an alternator on units powered with engine
springs (32), and brushes (9) from brush plate (12).
model D333TA. This section will describe alternator and
(15) Remove two dowel pins (20) from frame
generator maintenance.
(13).
(16) Remove eight screws (27) then remove
3-2. Generator (for Engine Model 687C1 8-ES)
pole shoes (25) and coils (21, 23, 24, and 26) as a unit,
from frame (13). Remove two insulators (22) from frame
a. Removal and Installation. Refer to TM 53810-
(13).
201-12 and remove or install the generator.
(17) Remove four screws (10), lockwashers
(11), and elbow (18) from frame (13).
b. Disassembly or Reassembly.
(18) Remove four screws (14), lockwashers
(11), and receptacle (15) from elbow (18).
(1) Loosen screw and remove cover band
(19) Reassemble by reversing the procedures
(28, fig. 3-1) from frame (13).
in steps (1) through (18) above.
(2) Remove nut (46), washer (45), and cup
(44) from armature (34).
c. Cleaning, Inspection, Test and Repair. Refer to
(3) Use a suitable puller and remove sheave
TM 5-764 for instructions on cleaning, inspection, testing,
(43) and fan (42) as a unit.
and repair of the generator.
(4) Remove four screws (39), lockwasher
(41), and fan (42) from sheave (43).
3-3. Alternator (for Engine Model D333TA)
(5) Remove collar (40) from armature (34).
(6) Position generator with drive end up;
a. General. This alternator is a self-rectifying AC
remove six screws (48), lockwasher (4), and end frame
generator. It contains a rectifier consisting of six diodes
(37) from frame (13).
which changes the AC voltage produced in stator
(7) Remove armature (34) from frame (13), by
windings to DC voltage. A separate transistorized
carefully lifting armature straight up and out of frame.
regulator controls the alternator output. Two brushes,
(8) Remove bearing (7) from armature (34).
each riding on a separate slip ring, supplies direct
(9) Remove six screws (47), lockwasher (11),
current to rotor field windings in an amount demanded by
plate (35), bearing (36), and plate (38) from frame (37).
regulator, thus controlling strength of the magnetic field.
(10) Remove the screws (10) and lockwasher
(11) from brush terminals of field coils (21, AGO "1MIA
23, 24, and 26); from lead (8), receptacle (15), and from
brush plate (12).
3-1
