novaG
– 2K
Service Manual
21/23
Issue 1.6
Isocyanate pump lubrication system
Each day, inspect the lubrication cup of the Isocyanate pump and check the state of the DOTP
plasticizing oil. Replace the oil when it shows changes in color or signs of solidification.
The DOTP oil solidifies as a result of the absorption of moisture and the maintenance interval
will depend on the working conditions.
The oil discoloration is due to the small film of Isocyanate that lies on the pump shaft during the
pumping operation. If the gaskets and the seals are in a good state, the plasticizing oil will not
have to be changed so frequently.
To replace the plasticizing oil of the pump, proceed as follows:
a) Use the gun to project until the Isocyanate proportioning pump is at the highest point of
the rising run. Turn OFF the air supply valve (transversal to the flow air direction).
b) Remove the existing DOTP oil from the cup, clean the cup and the shaft of the pump,
eliminating any remain power supply of polluted oil or crystallized material. Use a
wooden or plastic tool to clean the shaft. Fill the cup with new DOTP plasticizing oil.