18 308793
Maintenance
Preventive Maintenance Schedule
The operating conditions of your particular system
determine how often maintenance is required. Estab-
lish a preventive maintenance schedule by recording
when and what kind of maintenance is needed, and
then determine a regular schedule for checking your
system. Your maintenance schedule should include the
following:
Flushing
WARNING
FIRE AND EXPLOSION HAZARD
Before flushing, read the section FIRE
AND EXPLOSION HAZARD on page
4. 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. 6.
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
If you see excessive leaking at the throat, and tighten-
ing the packing nut does not help, replace the throat
packings. See page 27.
01921B
Fig. 6
21
1
Torque to 34–40 NSm
(25–30 ft–lb).
1
Senator Pump
Shown
