Maintenance - NVE 866 Challenger Series Owner's Manual

Maintenance _____________________________________________________

Washing
• Periodically wash the mud and dirt off of your pump as it must
be clean to allow heat to radiate from it.
Flushing
We recommend periodic flushing of your pump. To do this:
1. Connect the hose to the flush valve located on the side of the
inlet port.
2. Put the end of the hose in a one pint container of diesel fuel.
Start your pump and run as slow as possible.
3. With the 4-way valve in the vacuum position, open the flush
valve and monitor the diesel flow to your pump.
4. When the diesel fuel is gone, switch the 4-way valve to
neutral and run the pump for 2 minutes.
5. Speed the pump up to normal RPM, switch the 4-way valve to
vacuum.
6. Remove the hose and close the valve.
7. Properly dispose of used oil and flushing fluid.
Checking Vane Wear
We recommend checking vane wear at least every 12 months.
• A new vane is flush with the outside diameter of the rotor.
• Remove the plug from the vane check port, insert a rod to rotor
O.D., rotate rotor until the rod falls into one of the vane slots. If
the rod falls more than a 1/4" into any of the 6 vane slots, it's
time to replace the vanes.
• Vanes should be replaced in sets and it is always a good idea
to have an extra set of vanes on hand for emergencies.
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