Part 1 - Overview - Hydra-Cell Service and Maintenance Video (2:43)

Part 2 - Fluid End Service - Hydra-Cell Service and Maintenance Video (8:42)

Part 3 - Fluid End Service Continued - Hydra-Cell Service & Maintenance Video (5:55)

Part 4 - Fluid End Service Continued - Hydra-Cell Service and Maintenance Video (5:36)

Part 5 - Fluid End Service Continued - Hydra-Cell Service and Maintenance Video (3:13)

Part 6 - Hydraulic End Service - Hydra-Cell Service and Maintenance Video (6:55)

Part 7 - Hydraulic End Service - Hydra-Cell Service and Maintenance Video (2:12)

Part 8 - Hydraulic End Service - Hydra-Cell Service & Maintenance (9:09)

Part 9 - Troubleshooting - Hydra-Cell Service and Maintenance Video (5:12)

Hydra-Cell MT8 Service Videos

MT8 Hydraulic End Priming (11:13)

MT8 Fluid End Priming (6:06)

Replacing the MT8 Metering Pump Check Valves (11:21)

Replacing the MT8 Metering Pump Diaphragms (11:13)

Priming an MT8 Pump: Troubleshooting

Thank you for purchasing and installing a Hydra-Cell MT8 metering pump. If you experience difficulty priming the pump, please refer to the tips below.

Do not inspect the diaphragms

This is often the first impulse, but it should only be the last resort. Disassembling the pump to inspect the diaphragms will cause a loss of prime in the hydraulic (power) end. A diaphragm repair kit will then be needed to replace the PTFE components.

Increase motor speed

Gearboxes with a ratio of 30:1 or higher tend to have more priming issues. In such cases, “overspeed” the motor–starting at 200 revolutions per minute (rpm) or more–so that the pump speed is approximately 150 revolutions per minute (rpm).

Alternatives to increasing motor speed

  • Start and stop the pump.
  • While the pump is running, remove the main pressure relief valve (PRV) to see if any air became entrapped in the hydraulic end during shipping.
  • Temporarily install a priming pump to feed the MT8 until it primes.

Checklist of other solutions

  • Do not try to prime against system pressure.
  • Do not open any bypass valves.
  • Make sure that the inlet conditions are proper, including NPSH.
  • If priming outdoors, the pump temperature must be above 40 ̊F (4.4 ̊C).
  • Verify that the pump shaft is turning by removing the oil cap to view the crankshaft.
  • The main PRV must be in place, or no fluid will pump.
  • If it sounds like the gearbox is making a knocking sound, and the flow rate is low, then air is entrapped in the fluid end of the pump. (It is not the gearbox regardless of the sound.)

Different check valve materials

Wanner Engineering has determined that the inability to prime is because the PTFE O-rings inside the check valve are not sealing.

Contact factory for internal check valve O-rings in another material:

FKM (Viton®) – We will supply test check valves with FKM O-rings at no cost.
FFKM (Kalrez®) – We consider FFKM O-rings a good option for high gearbox ratios. Due to the expense of FFKM, however, there will be a cost.

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