failure of the unit.
When available use a pencil type belt tension gauge to
accurately set the tightness. (See Figure 57). If no gauge
is available, use a straight edge and a measuring tape
(See Figure 58) and estimate a tightness that does not
stretch the belt.
12 V DC GENERATOR MAINTENANCE
IMPORTANT! The voltage regulator used on the Motorola
Model RA Generator must be Type 8RF201 1A with high
voltage suppression feature. Do not substitute R3-1 or R.3-
2 Regulators as neither type will last in this application.
Checking Belt Tension Using Pencil Type Gauge
Figure 57
GENERATOR V-BELT TENSION
It is important to keep the generator V-Belt at the
proper tension. A loose belt will slip when the generator
load is high and it will fail to produce the required current
when most needed. An overly. tight belt will cause very
Motorola 12 Volt DC Generator
Figure 59
V-BELT TENSION - When installing a generator be sure
the pulley is in line with the motor drive pulley. Tighten the
V-belt by putting pressure on the fan end of the housing.
Do not apply pressure to the voltage regulator end! The
belt should be just tight enough so that the driven pulley
will not slip when an attempt is made to turn the fan by
hand. (See Figure 60).
Checking Belt Tension With Straight Edge & Tape
Figure 58
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