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Maintenance
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure
on page 8.
Keep the wet–cup (25) filled with Graco Throat Seal
Liquid (TSL). See Fig. 3. Check tightness of packing
nut (36 or 60) weekly. The packing nut should be tight
enough to prevent leakage, but no tighter. Follow the
Pressure Relief Procedure
on page 8 before adjust-
ing the packing nut.
Never allow the pump to run dry of fluid being pumped.
A dry pump will quickly accelerate to a high speed,
possibly damaging itself. If your pump accelerates
quickly, or is running too fast, stop it immediately and
check the fluid supply. If the supply container is empty
and air has been pumped into lines, prime pump and
lines with fluid, or flush and leave filled with compatible
solvent. Eliminate all air from fluid system.
For overnight shutdown, follow the
Pressure Relief
Procedure
on page 8. Always stop the pump at the
bottom of its stroke to keep fluid from drying on the
exposed displacement rod. Always flush the pump
before the fluid dries on the rod. If the pump is to be
stored, and you are pumping water–based fluids, first
flush with water, then with mineral spirits to protect the
pump parts.
