7
Rosco Maximizer 2B Asphalt Distributor
7-9
Maintenance
Solenoid Valve Check
The air valves are located in the rear valve compartment .
To check the solenoid valves:
1 . Shut Master switch OFF or disconnect the power
wire from the solenoid on the valve .
2 . Depress or turn the slotted button on the air valve .
You should hear the valve or air actuator respond .
3 . Reset to normal and the valve should return to its
original position .
4 . On the 3-Way valve check both top and bottom
solenoid valves .
5 . Reconnect the power wire .
Electrical Check
Disconnect power wire and use a digital multimeter to
check the coil resistance . A good coil will have between
30 and 35 ohms resistance .
3-Way Valve Position 1
Figure 7-6
Top Solenoid Valve OFF
Bottom Solenoid Valve OFF
1 . Visually inspect the screen at the start of each
working day and whenever the cap is removed from
the load line .
2 . Remove any objects lodged against the screen . Do
not remove the screen for cleaning .
3 . Inspect the screen for damage or holes . If any are
noticed, remove screen from the line and replace
immediately .
Do not operate the machine with a
damaged screen Objects that enter the system can
damage the pump
Pump Drive
The asphalt pump is driven by a fixed displacement
hydraulic motor through a double chain coupler (
) . Inspect the components and maintain the system
in good working order . To inspect the pump drive, follow
this procedure:
1 . Stop the engine, place all controls in neutral, set the
park brake and remove ignition key .
2 . Allow machine to cool to the touch .
3 . Visually check the condition of the coupler on a
bi-weekly basis . If wear can be seen on the rollers
or sprocket teeth, replace the coupler . Be sure
the shafts are aligned and the sprockets securely
fastened to the shaft before resuming operation .
4 . A sensor is installed in the hydraulic motor to
measure motor speed . If the sensor malfunctions,
contact an authorized Rosco dealer for assistance .
5 . Check the tightness of the hydraulic motor mounting
bolts . Tighten if necessary . Adjust the hydraulic
motor mounts when aligning shaft and chain
coupler .
Automatic Valves
The asphalt flow is controlled by a 2-Way valve, a 3-Way
valve and a Tank Valve . The valves are switched using
electric solenoid valves controlling air flow to the asphalt
valve actuators . Refer to
, and
to understand the function of the 3-Way
Valve System .
Functional Check
Cycle the Plus One Controller Mode Selection from
one mode to another and watch the valve to see if it
functions correctly (see
) .
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