Graco ProMix PD2K Installation Manual page 35

ISO Oil Fill Procedure
When using polyurethane coatings with isocyanate
catalysts in high-humidity environments, use of ISO
oil on the catalyst pump TSL cup is recommended
instead of TSL. The ISO oil will present a barrier
that will prevent catalyst hardening from contact with
moisture. When performing the first fill of a cup with
ISO oil, it will be necessary to bleed the air out of the
feed line.
NOTE: If not already present on the TSL cup, draw
the two horizontal lines at, and slightly above, the
vertical center of the front of the cup before filling.
332457H
To bleed air:
1. Fill the catalyst pump TSL cup to the lower
horizontal line.
2. Remove one plug (73d) from the upper throat
cartridge and allow air in that area to flow until no
air is being expelled. Replace the plug.
3. Repeat step 2 at the lower throat cartridge.
4. Use absorbent rags to clean up excess ISO oil
that escaped from the plug holes.
5. Replenish the ISO oil level in the TSL cup to the
lower horizontal line.
TSL Cup Kit
35