Graco Proportioner 259026

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.

The inlet strainers filter out particles that can plug the pump inlet check valves. Inspect the screens daily as part of the startup routine, and clean as required.

Use clean chemicals and follow proper storage transfer and operating procedures to minimize contamination of the A-side screen.

NOTE Clean the A-side screen only during daily startup. This minimizes moisture contamination by immediately flushing out any isocyanate residue at the start of dispensing operations.

1. Close the fluid inlet valve at the pump inlet and shut off the appropriate feed pump. This prevents material from being pumped while cleaning the screen.

2. Place a container under the strainer manifold 59d to catch fluid. Remove the strainer plug 59j.

3. Remove the screen 59g from the strainer manifold. Thoroughly flush the screen with compatible solvent and shake it dry. Inspect the screen. If more than 25 percent of the mesh is blocked replace the screen. Inspect the gasket 59h and replace as required.

4. Ensure the pipe plug 59k is screwed into the strainer plug 59j. Install the strainer plug with the screen 59g and gasket 59h in place and tighten. Do not overtighten. Let the gasket make the seal.

5. Open the fluid inlet valve ensure that there are no leaks and wipe the equipment clean. Proceed with operation.;

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