Regulator Checks and Adjustments

TM 5-6115-400-35

screws attaching the lower contact

bracket, and raise or lower the

contact bracket as required. Be

sure the points are properly lined up

and tighten the screws well after

adjustment.

(b) Point opening-Measure

the point

opening and adjust by bending the

upper armature stop.

closing voltage on the cutout relay,

insert Special Testing Harness No.

1 (fig. 13) in the generator circuit,

and connect a voltmeter between T-

1 (armature) and the regulator (fig.

13). Gradually increase generator

speed and note the voltage at which

the relay contact points close.

Adjust the closing voltage, if

necessary, by turning the adjusting

screw at the base of the cutout relay

frame. Increasing the spiral spring

d. Cleaning Contact Points. Clean contact points

tension increases the relay closing

with a fine-cut riffler file. The contact file should not be

voltage decreasing the spiral spring

allowed to become greasy and should not be used to file

tension lowers the closing voltage.

other metals. When cleaning the contact points it should

(2) Voltage Regulator.

Two checks and

be remembered that tungsten is extremely hard and

adjustments are required on the voltage

platinum is relatively soft. Platinum points should be

regulator: air gap and voltage setting.

filed very lightly to avoid excessive loss of metal. Never

Attention is called to fact that the AIR

use sandpaper or emery cloth to clean contact points.

GAP and not the POINT OPENING is

e. Regulator Checks and Adjustments (fig.12).

checked and adjusted.

(1) Cutout Relay.

Three checks and

(a) Air Gap-The air gap should be

adjustments are required on the cutout

measured between the armature

relay; air gap, point opening, and closing

and the part of the core (not the

voltage. Air gap and point opening are

residual pin in the core) next to the

checked with the battery disconnected.

residual pin, with the points just

(a) Air Gap-Measure the air gap

touching.

The proper way to

between the armature and the core-

measure this air gap is to push the

not between the brass pin in the

armature down until the points

armature and the core-with the

open, release until the points barely

contact points barely touching. If

close, then measure the air gap. Do

both sets of points do not close

not measure the gap with the flat

together, it will be necessary to

spring that supports the contact

realign the lower contact bracket

screw raised up off the fiber

slightly or to bend the spring fingers

mounting plate. To adjust, loosen

on the armature until points TM 5-

the locknut and turn the contact

115-40-3 do meet simultaneously.

Adjust air gap by loosening the two