Graco Proportioner 259058

• Check hoses and couplings daily. Replace worn or damaged parts immediately.

• Check equipment daily. Repair or replace worn or damaged parts immediately with genuine manufacturer’s replacement parts only.

• Component B (Resin) Pump: Check felt washers in packing nut/wet-cup (S) daily. Keep saturated with Graco Throat Seal Liquid (TSL), Part No. 206995, to prevent material from hardening on displacement rod. Replace felt washers when worn or contaminated with hardened material.

• Check wet cup TSL level daily.

• Do not overtighten packing nut/wet cup. Throat u-cup is not adjustable.

• Inspect fluid inlet strainer screens daily. See below.

• Inspect ISO lubricant level and condition daily. See page 36. Refill or replace as needed.

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

• Clean gun mix chamber ports regularly. See gun manual.

Check the condition of the ISO pump lubricant

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

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

Follow the Pressure Relief Procedure page 25

Lift the lubricant reservoir LR out of the bracket RB and remove the container from the cap

Holding the cap over a suitable container, remove the check valve and allow the lubricant to drain

Reattach the check valve to the inlet hose

Warning: This maintenance check requires trained personnel with PPE!

Close the fluid inlet valve at the pump inlet and shut off the appropriate feed pump

Place a container under the strainer manifold 59d to catch fluid

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

Ensure the pipe plug 59k is screwed into the strainer plug 59j