866 Challenger Series |
19
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 the fins to dissipate heat properly.
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�
Close the valve and remove the hose.
7�
Drain oil catch muffler and properly dispose of used oil and flushing
fluid.
Checking Vane Wear
We recommend checking vane wear, at a minimum, 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 clean 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.
