Rosco Maximizer 2B - Run Simulation Example; Trial Run

6
Rosco Maximizer 2B Asphalt Distributor 6-47
Operation
5. Select a transmission gear and axle ratio to give the
required ground speed of 350 FPM (106.68 mpm).
Use the panel readout to measure the speed. The
best results are obtained when the engine speed
is maintained between 1500 and 1800 RPM for a
specic gear ratio.
6. Operate the unit in the Bar Circulate Mode. Use the
Manual Pump Speed dial on the Plus One Controller
to set the pump ow to 140 GPM (530 LPM) at the
specic engine RPM for operation.
7. Drive the unit over the application route in the
specic gear, axle ratio, engine RPM and travel
speed, and set the pump rate.
8. Record all operating parameters on your data sheet
(Table 6-4. Valve Status During Operational
Modes) for future reference.
NOTE: Small variations in ground speed will not
affect the application rate. As the truck speed
increases or decreases, there will be a
proportional increase or decrease in the ow
from the hydrostatic pump. This will also give a
proportional change in the asphalt pump ow.
Trial Run
A trial run can be made with the unit spraying to verify
the application rate. This may be required if the material
being sprayed has a viscosity that is different than that
normally sprayed.
1. Measure the amount of material in the tank. Read
the measuring stick in the top opening or weigh the
unit before and after the run to measure the volume
sprayed during the run. This latter method requires
that you know the density or the weight per gallon of
the asphalt.
2. Mark out a known distance on the spraying area.
Use even numbers such as 600 or 900 feet (183 or
274 meters) to make the calculations easy. Allow a
starting distance before you begin spraying so the
truck speed and pump ow stabilize.
3. Start spraying as you cross the start line. Maintain
the ground speed and engine RPM at the values
recorded on the data sheet.
4. Watch the pump GPM on the Run Screen readout
closely. You may have to adjust the speed slightly to
compensate for the change between Bar Circulate
and Spray. Use the Manual Pump Speed dial to
make the adjustment.
speed FPM (mpm) scale. For 12 Ft bar and 0.3 rate
setting you should read 250 FPM (76.2 mpm) below
100 GPM (378.5 LPM) and 425 FPM (129.54 mpm)
below 170 GPM (643.5 LPM).
4. Select a truck speed between 250 and 425 FPM
(72.6 and 129.5 mpm) that is appropriate for the
terrain and operating conditions.
5. Select the pump ow rate above the selected truck
speed.
For example:
Select 350 FPM /4.0 MPH (106.68mpm / 6.4008
kph) as speed.
140 GPM (529.95 LPM) will be the pump setting.
NOTE: Do not exceed the nozzle maximum ow, (see
Nozzle Size to Flow Rate in Section 6): 170
GPM (643.52 LPM) is overow for 36 #1 nozzles.
Call a Rosco factory representative for additional
help.
Run Simulation Example
For this phase of manual calibration and operation,
a loaded Distributor operating in the Bar Circulate
Mode will be driven per the operator’s calculations. It is
recommended that a data sheet be kept to record the
machine performance and application information for
future reference.
1. Before starting, review and follow the Pre-Operating
Check List, (see Pre-Operating Check List in
Section 6).
NOTE: Read Modes Of Operation before proceeding,
(see Modes Of Operation in Section 6).
2. Load the tank.
3. Go to the simulation area.
4. Check that the material in the tank is at the proper
application temperature and level so that the heat
tubes are covered with at least 8 inches of material..
NOTE: Application temperatures will vary depending
on the product being used. Refer to the product
supplier’s recommendations for application
temperatures.
NOTE: Temperature affects the viscosity of the material.
If the temperature is not at the recommended
rate, the range in viscosity could affect the
accuracy of the calibration, (see Guideline
Temperatures For Liquid Asphalts in Section
4).
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