Graco 220-569 manual Maintenance, Flushing, Packing Nut Tightness, Excessive Leaking at Throat

Maintenance

The operating conditions of your particular system determine how often maintenance is required. Estab- lish a good maintenance schedule during the first several weeks of operation by recording when and what kind of maintenance is needed, and then deter- mine a regular schedule for checking your system. Your maintenance schedule should include the follow- ing:

Flushing

WARNING

FIRE AND EXPLOSION HAZARD

Before flushing, read the section FIRE

AND EXPLOSION HAZARD on page

5.Be sure the entire system and flush- ing pails are properly grounded. Refer to Grounding on page 7.

1.Flush before shutting down the system for an extended period of time.

2.Flush before repairing the pump, if possible.

3.Flush before the fluid you are pumping can dry out, settle or set up in the pump and hoses.

Packing Nut Tightness

The packing nut (21) should be tight enough to stop leakage, but no tighter. Overtightening compresses and damages the packings, and may cause the pump to leak, reducing performance. See Fig. 4.

To check the adjustment of the packing nut, first re- lieve fluid pressure. If you have a torque wrench, tighten the packing nut to 34–40 NSm (25–30 ft–lb).

Excessive Leaking at Throat

To monitor leaking at the throat, remove one of the small plugs (31) from the packing nut (21). Place one end of a drain tube in the hole and the other end in a container. See Fig. 4. Monitor the drainage. If it seems excessive, and tightening the packing nut does not help, replace the throat packings. See page 20.

1	Torque to 34–40 NSm
	(25–30 ft–lb).

211

31 31

01925

Fig. 4

￿￿7￿8￿9 15