PAGE 22 — MAYCO MG-30 PUMP — PARTS & OPERATION MANUAL — REV. #1 (03/12/03)
To change from a fine texture to a heavy browning pattern, follow
these steps:
1. Lower the air pressure.
2. Change to a larger size orifice.
3. Set the air jet farther back from the orifice.
4. Increase the volume of material.
To increase nozzle frequency and obtain small plaster globules,
reverse the above procedure.
MG-30 PUMP — GENERAL INFORMATION
Since the operator feels little or no pulsation when running the
Mayco Model MG30 plastering unit, it would appear that plaster
comes from the nozzle in a steady stream. Actually, in operation,
a globule of plaster comes from the nozzle and is then followed
by a globule of compressed air.
The Mayco nozzle can be operated with as few as 50 plaster
globules per second, or a frequency of 50 cycles per second,
and as high as 1,000 cycles per second with the pump operating
at a constant volume.
When the nozzle is emitting 50 plaster globules per second,
each globule is 20 times the size of the plaster globules emitted
when the nozzle is set for 1000 plaster globules per second.
Here lies the basis for the various applications of the Mayco
Model MG30.
For example, when a fine texture is desired, the nozzle should
operate at a high frequency to break the plaster up into small
particles. In scratching metal lath, it is desirable to produce large
plaster globules that will adhere to the metal lath. Difference in
frequency can be detected by the sound of the nozzle in
operation. When the sound at the nozzle is high, almost at a
scream like pitch, the frequency is high and the globule size is
small.
How the Nozzle Operates
With the machine running at a rate to brown 80 square yards 1/2"
thick, you should use a 1/2-inch (1.27cm.) orifice and the distance
from the air stem to the orifice would be 3/8-inch (.952 cm.). To
scratch metal lath at the same pumping speed, you would set the air
stem from 1/2 to 5/8-inch (1.27 to 1.58 cm.) from the orifice, and you
would probably use a 5/8-inch (1.58 cm) orifice.
When adjusting the air pressure, it is desirable to get a good
even pattern in the spray. If the air pressure is too high, the plaster
will rebound from the wall. If the air pressure is too low, the spray
pattern will be very narrow and plaster cannot be sprayed on
‘evenly. Adjust air pressure at nozzle to obtain the desired pattern.
ESSICK MIXER
The Essick Model EM120SM
plaster
and
mortar
mixer is
shipped completely assembled and has been factory tested.
The drum batch capacity of these mixers is between 3.5 and
4.0 bags. With proper care, they will give continuous service
year-after-year.
This mixer is powered by a
HATZ
Model 1B30, 8.0 HP
diesel
engine. The power from the engine is transmitted via a clutch/
reduction assembly that is coupled directly to the paddle shaft.
Therefore providing high mixer torque and eliminating V-belts .
BEFORE STARTING
Before starting the engine, read the engine
owners manual and thoroughly understand the
safety information.
OIL LEVELS
Be sure to check the oil levels in the engine and transmission
before starting the mixer.
DIESEL ENGINE CARE
For care and operation of either
HATZ
diesel engine, refer to the
engine manufacturer’s operating instructions furnished with the
engine. We recommend draining and refilling the engine
crankcase at least every thirty hours of operation. Check the
engine oil level daily.
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