Multiquip 900HD~2600HD - Manual (Page 15)

FLeXSHaFTS/VIBRaTOR HeaDS • OpeRaTIOn anD paRTS manuaL — ReV. #0 (07/16/10) — page 15
OperatiOn
OpeRaTIOn
Before connecting any of the flexible-shafts referenced in
this manual, please read any and all operating instructions
relating to the drive motor associated with the flex-shaft.
Using the wrong drive motor can adversely affect the
performance of the flexshaft/vibrating head. Selecting too
large a flexshaft/vibrating head combination will overload
the motor and cause excessive wear.
1. 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.
2. Keep flexshaft (Figure 6) 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.
Figure 6. Vibrator Head Insertion
3. Completely immerse the vibrator head quickly into
the concrete mix at a verticle 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.
4. Stop vibration of concrete mix when concrete has a
level, glossy surface and there are no breaking air
bubbles.
5. 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.
1-1/2 TIMES AREA
OF INFLUENCE
CORRECT INCORRECT
FLEX-SHAFT
VIBRATOR HEAD
VIBRATOR HEAD
6. 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.
7. When near the top of the mix, withdraw the vibrator
quickly.
8. Re-insert vibrator into mix according to the "area
of influence" See Figure 6. Establish a symmertical
overlapping pattern for inserting and removing the
vibrator head.
9. 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.
NOTICE
DO nOT use vibrator to move concrete laterally. This
will cause segreation of the concrete. Use a shovel or
similar device to spread the concrete.