TM 5-3820-233-35/2
the armature over a shorted area as the armature is
turned.
(4) Inspect the field windings for worn or
frayed insulation, defective connections, opens, and
field current draw.
(5) Replace or repair all defective parts
as necessary.
h.
generator in direct reversal of disassembly.
Seat
brushes using a seating hone or sandpaper wrapped
around commutator. Clean commutator thoroughly and
complete assembly.
i.
Installation. Refer to Operator's Manual.
32. Generator Regulator
a.
is a watertight, fungus and corrosion resistant unit for
military applications. It is a heavy-duty, 24-volt, 40-
ampere unit, designed for use in a negative grounded
system and for generators having an internally grounded
field circuit. Terminals of the regulator are housed in
special
conforming
to
Ordnance
specifications. Connections to the regulator are made
by means of mating Ordnance type receptacles on the
vehicle wiring harness.
b.
Removal. Refer to Operator's Manual.
c.
Regulator Maintenance.
(1) Test specifications for regulator
Model 111 8858 are as follows.
Voltage Regulator:
Figure 12-1. Generator regulator with cover re-
Air gap (inches) ......................................084
moved.
Satisfactory operating range (volts) .......13.9-14.9*
If outside range, adjust to (volts) ...........14.3*
(2) Mechanical checks and adjustments
Current Regulator:
(air gaps, point openings) must be made with the battery
Air gap (inches) ......................................115
disconnected and regulator preferably off the vehicle.
Satisfactory operating range (amp.) . ....38-42*
d.
Cleaning Contact Points. Clean contact
If outside range, adjust to (amp.) ...........40*
points with a fine-cut riffler file. The contact file should
Cutout Relay:
not be allowed to become greasy and should not be
Air gap (inches) ......................................048
used to file other metals. When cleaning the contact
Point opening (inches) ............................035
points it should be remembered that tungsten is
Satisfactory closing range (volts) ..........11.8-13.4*
extremely hard and platinum is relatively soft. Platinum
If outside range, adjust to (volts) ...........12.8*
points should be filed very lightly to avoid excessive
Resistor Values (OHMS):
loss of metal. Never use sandpaper or emery cloth to
A ...........................................................40 (2)
clean contact points.
B ...........................................................375 (2)
e.
Regulator Checks and Adjustments (fig. 12-
C ...........................................................100 (1)
2).
D ...........................................................100 (2)
(1) Cutout Relay.
Three checks and
E ...........................................................20 (1)
adjustments are required on the cutout relay;
* These values apply only when the regulator is
being tested at operating temperature, on the vehicle,
and in accordance with the procedure described in the
following section.
3-7
