Maintenance - NVE MEC 5000 Owner's Manual & Operating Instructions

Maintenance

• With force feed type, the lubrication rate is adjustable
at dripper and should be checked on a regular basis. Oil
should be supplied to pump at a rate of 1 drop every 2
seconds.
• Average usage of oil is approximately 1-2 qts. per 40 hours,
depending on operation.
• Oil should be changed every 2000 hours in gear per
housing, if equipped.
• Front bearing should be greased approximately every 4
months. Use caution when greasing bearing not to over
grease, as this can cause damage to seals.
• Normal vane life is approximately 2000 hours; however, this
will vary greatly with temperature, material being pumped
and proper maintenance.
• Occasionally liquid and dirt may enter the pump causing
vanes to stick in the rotor slots along with excessive vane
and housing wear. When this occurs you must clean the
inside of the pump.
Cleaning the inside of the pump
• Remove air inlet hose or pressure relief valve.
• Run pump at an idle with the changeover valve in neutral.
• Pour 1 pint of diesel fuel into pump through the air inlet
or fitting. Allow pump to run for 30 seconds then turn the
change over valve to vacuum.
• Repeat two steps above several times, and then pour 2 oz.
of oil into the pump and reassemble.
• Stop pump and turn slowly by hand while listening for vanes
dropping. All vanes should move freely in the rotor slot.
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