Graco Proportioner 259025

Warning: This maintenance check requires trained personnel with PPE!

Fluid inlet valve at the pump inlet closed and appropriate feed pump shut off?

Upload a photo of the container placed under the strainer manifold 59d

Upload a photo of the removed screen 59g from the strainer manifold

Screen 59g thoroughly flushed with compatible solvent and shaken dry?

Is more than 25 percent of the mesh blocked?

If more than 25 percent of the mesh is blocked, replace the screen.

Gasket 59h inspected and replaced as required?

Component B (Resin) Pump: Check felt washers in packing nut/wet-cup (S)

Inspect fluid inlet strainer screens

Inspect ISO lubricant level and condition

Keep component A from exposure to moisture in atmosphere to prevent crystallization

Check the condition of the ISO pump lubricant daily.

Change the lubricant if it becomes a gel, its color darkens, or it becomes diluted with isocyanate.

Gel formation is due to moisture absorption by the pump lubricant.

The interval between changes depends on the environment in which the equipment is operating.

The pump lubrication system minimizes exposure to moisture, but some contamination is still possible.

Lubricant discoloration is due to continual seepage of small amounts of isocyanate past the pump packings during operation.

If the packings are operating properly, lubricant replacement due to discoloration should not be necessary more often than every 3 or 4 weeks.