UM HANDHELD VIBRATOR • OPERATION MANUAL — REV. #0 (06/29/20) — PAGE 13
OPERATION
1. Connect the vibrator to the proper power source.
2. If an extension cord is necessary, refer to Table 3 for
the correct type of extension cord to use.
3. Hold vibrator head above concrete pour when starting
drive motor. This will prevent the vibrator head from
bouncing on hard surfaces which could damage the
bearings.
4. Push the ON/OFF switch to the ON position then
immerse into the surface. Do not run the motor outside
of the surface for long periods.
5. Keep flexshaft (Figure 3) straight as possible when
operating. Sharp bends increase the load on the core
and drive motor, which will result in early core failure
and possible damage to the drive motor.
Table 3. Extension Cord Types
Current
in
Amperes
Load in Watts
Maximum Allowable Cable Length
At 100
Volts
At 200
Volts
#10 Wire #12 Wire #14 Wire #16 Wire
2.5
300
600
1000 ft.
600 ft.
375 ft.
250 ft.
5
600
1200
500 ft.
300 ft.
200 ft.
125 ft.
7.5
900
1800
350 ft.
200 ft.
125 ft.
100 ft.
10
1200
2400
250 ft.
150 ft.
100 ft.
15
1800
3600
150 ft.
100 ft.
65 ft.
20
2400
4800
125 ft.
75 ft.
50 ft.
NOTICE
When the ambient temperature is low, warm up the
motor for 2 to 3 minutes before use..
NOTICE
The rated time of the motor is 30 minutes. The rated
time is the time that can be used at the rated output.
Use within the rated time, and be sure to rest for the
same amount of time (or longer) as the usage time.
.
Figure 3. Vibrator Head Insertion
6. Completely immerse the vibrator head quickly into
the concrete mix at a vertical rate of about one foot
per second (0.3 meters/second). Vibrate concrete for
about 5 to 15 seconds for wet mixes. For stiff mixes
vibrate 2-3 minutes.
7. Stop vibration of concrete mix when concrete has a
level, glossy surface and there are no breaking air
bubbles.
8. Slowly lift the head out of the mix using an up and
down movement. This slight up and down movement
will close the hole formed by the vibrator.
9. When lifting the head out of the concrete, withdraw
slowly at a rate of about 3 sec./ft. Using this technique
will avoid the re-trapping of air.
10. When near the top of the mix, withdraw the vibrator
quickly.
11. Reinsert vibrator into mix according to the "area of
influence" See Figure 3. Establish a symmetrical
overlapping pattern for inserting and removing the
vibrator head.
12. If concrete is poured in layers, allow vibrator to pass
within 3 to 6 inches (76 to 152 mm.) into next layer to
ensure the knitting of the two layers. The complete
bonding of layers will prevent "lift lines" when forms
are removed.
1-1/2 TIMES AREA
OF INFLUENCE
CORRECT
INCORRECT
FLEX-SHAFT
VIBRATOR HEAD
VIBRATOR HEAD
NOTICE
DO NOT
use vibrator to move concrete laterally. This
will cause segregation of the concrete. Use a shovel
or similar device to spread the concrete.
OPERATION
