Graymills DDP 1' Pump OMI - Manual (Page 13)

13
Maintenance
Lubrication
The air valve is designed to operate unlubricated, however
if lubrication is desired, every 500 hours of operation (or
monthly) remove the hose from the pump air inlet and add
two drops of machine oil to the air inlet.
CAUTION
Do not over-lubricate the pump. Oil is exhausted
through the muffler, which could contaminate your
fluid supply or other equipment. Excessive lubrication
can also cause the pump to malfunction.
Flushing and Storage
Flush the pump often enough to prevent the fluid you are
pumping from drying or freezing in the pump and damag-
ing it. Always flush the pump and follow the Pressure
Relief Procedure on page 11 before storing it for any
length of time. Use a compatible solvent.
Tightening Threaded Connections
Before each use, check all hoses for wear or damage, and
replace as necessary. Check to be sure all threaded connec-
tions are tight and leak-free. Check and retorque all
threaded connections at least every two months. Retorque
the fluid cover screws first, followed by the manifold
screws.
The recommended frequency for retorquing of fasteners
varies with pump usage; a general guideline is to retorque
fasteners every two months.
Preventive Maintenance Schedule
Establish a preventive maintenance schedule, based on the
pump’s service history. This is especially important for
prevention of spills or leakage due to diaphragm failure.