Graco 3A0237L Maintenance, Instructions for Replacing Individual a or B Hose, Clean Orifice

Maintenance

Maintenance

1.Before disconnecting or repairing hoses, relieve all fluid pressure and shut off electrical power to pro- portioner. See system operation manual.

2.Be sure fluid is cool before disconnecting hoses.

Instructions for Replacing Individual A or B Hose

1.Before disconnecting hoses, relieve all fluid pres- sure and shut off electrical power to proportioner. See system operation manual.

2.Disconnect electrical wire from connectors (5). Dis- connect fluid hose and remove from bundle.

3.For whip hose bundles, see Bundle Individual Whip Hoses on page 26.

4.For hose bundles, see Bundle Individual Heated Hoses on page 28.

Clean Orifice

Only for MD2 Valve using Orifice Block Kit 24E505 and an orifice.

NOTE: 24E505 does not come with an orifice. See on page 39 for orifice part numbers.

1.Follow Pressure Relief Procedure in MD2 valve manual.

2.Use 5/16 in. nut driver to remove orifices.

NOTICE

To prevent cross-contamination of the orifices do not interchange A component and B component parts. The A component orifice is marked with an A.

3. Remove cap from orifice.

NOTE: The cap is held in place with reverse threads.

4.Remove needle from orifice. Thoroughly inspect all o-rings and replace if necessary.

5.If necessary, use drill bit that is the same size as the orifice to drill out the orifice. Orifice size is marked on the orifice.

6.Liberally lubricate all o-rings.

7.Reassemble in reverse order. Torque orifices into fluid housing to 20-30 in-lb (2.26-3.39 N•m).

24 3A0237L