16
| 607 PRO Challenger
Series
www.natvac.com | 800.253.5500
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 suction valve in the vacuum position, monitor the
diesel flow to your pump.
4� When the diesel fuel is gone, switch the suction valve to
neutral and run the pump for 2 minutes�
5� Speed the pump up to normal RPM, switch the suction
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
8 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�
