16
| 304 Challenger
Series
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 container with 4-5 ounces 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 once 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 outside diameter, 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 4 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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