ESH150
–3PE~400V
Service Manual
53/56
Ref. NR-000144-ENG
Isocyanate pump lubrication system
Inspect the isocyanate pump lube reservoir every day and check the condition of the DOTP
plasticizer oil it contains. Replace the oil if it is discoloured or exhibits signs of solidification.
DOTP oil solidifies as a consequence of moisture absorption. The frequency of oil changes
depends on the working conditions.
Discolouration of the oil is due to the thin film of isocyanate which is deposited on the pump
piston when the pump is operating. The plasticizing oil needs to be changed less frequently if
the seal rings and gaskets are in good condition.
To replace the plasticizing oil in the pump, proceed as follows:
a) Operate the spray gun until the isocyanate proportioning pump is at the highest point on
its upward stroke. Rotate the power switch to the OFF position.
b) Disconnect the unit from the power supply.
c) Remove the protective panels from the pump guides.
d) Remove the DOTP oil contained in the chamber, the clean the chamber and the pump
piston to eliminate any residue of contaminated oil or crystallized accumulations. Use a
wooden or plastic implement to clean the piston. Fill the chamber with new DOTP
plasticizing oil.
