Troubleshooting the March TE-5S-MD pump

March builds high quality pumps that will provide years of dependable service. Unlike cheaper pumps that can be frustrating to operate (due to such reasons as poor motor and body alignment leading to binding, poorly cast and low quality parts being easily broken, under powered motors leading to stoppage when grain enters the pump head and motors that readily burn out) these pumps are brewery workhorses that will provide years of dependable service. 

The March beer pumps are non-self-priming magnetic drive units built specifically to handle hot wort and water. They do not require a mechanical seal between moving parts (which greatly improves reliability) but they are not self-priming (meaning they need to be full of liquid to operate) and they require liquid being pumped to lubricate the internal parts. If the pump is run dry for a period of time the impeller and shaft may become damaged. The port and 3/4" (or 1") line leading to the pumps should always be fully open and it is best to never fully close the exit port on the pump when operating, as the free flow of liquid serves to ensure the pump head (impeller shaft) does not overheat. To regulate the flow only use a valve on the discharge/outlet side of the pump (either on the exit port of the pump, or the port where liquid is being returned to the brewing system from the pump.

If your pump is not pumping liquid, check the following things:

  1. Ensure the correct power is available to the pump (120 or 240V). The larger TE pump has an auto shut off if it is overheated. It should not get overheated under normal operation and if it happens repeatedly, it may be a sign of problems in the setup or with the pump. If it overheats, give it 10-15 minutes to cool off before attempting to operate again.
  2. When powered on, inspect the fan (opposite side of the pump head) to ensure it rotates freely. The fan moves in the same direction as the impeller which should be in a counter-clockwise direction (when facing the impeller side of the pump) to drive liquid out the exit port. If it is turning in a clockwise direction, it means the impeller will be pushing liquid in the 'wrong' direction. To correct this, an electrician can reverse the wires to the motor to cause it to spin in the correct direction. If the impeller does not spin at all, unplug the pump immediately as the impeller is likely jammed or misaligned and needs to be inspected (see step 4).
  3. Inspect the lines leading to the pump and returning to your vessel to ensure they are open, and full of free flowing liquid (water, wort or beer). A quick way to inspect to see if it is free flowing is to remove the distil (far) end of the return hose that is connected to the Mash Colander (or fermenter) and lower it until it is below the liquid level in the fermenter—liquid should passively flow out of the hose under the 'push' of gravity. If it does not, this likely means there is blockage somewhere in the line. Blockage could be at the start of the line (the exit port of the fermenter) which can be checked by removing the pump return hose connection and inspecting for blockage—or it could be in the return line, likely at the valve leading back into the vessel. If the line is not blocked, but liquid won't flow through, it could be blockage inside the pump head.
  4. If the pump fan and impeller are not moving, or liquid will not freely flow through the pump head, the head should be disassembled and inspected using the following steps.
 1. Remove the screws holding the head cover plate in place. Remove out cover of March pump
Inside march pump head 2. Inspect the inside of the head for debris, and gently turn the impeller to see if it is free moving.
3. Remove the shaft with white washer holding the impeller in place. March pump impeller and pin
March pump head removal 4. Remove the remainder of the pump head (ensure the impeller does not fall out).
5. Remove the impeller and inspect behind it for debris or soil that may impede it from freely spinning on the central shaft.  March pump TE 5S MD impeller
March pump magnet 6. Turn the motor on and off again and ensure the magnet driving the impeller freely spins.
7. Reinstall the housing, impeller, shaft, shaft gasket, face plate gasket, and face plate. March pump housing
March TE pump 8. Reinstall screws and hand tighten (first with fingers and then screwdriver) in a diagonal pattern (which helps with centering and correct gasket tightening). 


For more troubleshoot advice, consult the March website.

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