3-7-4 Asphalt Metering Pump Assembly Removal, Repair and Replacement See figure 3-42.
This procedure assumes a complete removal, repair and replacement of the assembly. A partial disassembly repair and
replacement is possible. Follow the procedure to the point of removing only those components requiring repair or
Disconnect and lock out the breaker for the asphalt metering pump motor.
The hot oil heating(heat transfer) lines should be cold as should the asphalt lines prior to starting this
procedure. If this is not the case PROCEED USING EXTREME CAUTION IN THE DISCONNECTING OF
HOT OIL LINES AND ASPHALT LINES. Cover all joints with a heavy cloth during disassembly operations.
See Sections 3-7-2 and 3-7-9 to close the valving affecting this part of the tanker.
Close the asphalt valve (item 2 in Section 3-7-9) between the tank and the asphalt pump.
Close the two valves (item 4 in Section 3-7-2) for the heat transfer oil.
Use sorbent fabric pad under the deck of the tanker to catch any liquid asphalt or heat transfer fluid that
escapes during the repairs.
Use a clean pail for the heat transfer fluid and a clean pail for the liquid asphalt that drains from the lines.
This material may be re-used.
Remove the mesh guard around the asphalt tanker rear deck.
Disconnect the heat transfer lines to the asphalt transfer pipe, the asphalt meter and the asphalt pump. Tag
these lines prior to removal recording which line goes to which port. Collect the heat transfer fluid in a pail.
Remove the asphalt line from the tanker to the drum mixer following the procedure outlined in the operators
Remove the asphalt transfer pipe by splitting the two flanges between it and the three way plug valve.
Remove the four bolts. Remove the gasket. Collect the liquid asphalt that may drain from the line.
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