Hydrotech MP Series PULSAtron - Manual (Page 23)

23
: Before performing any maintenance or repairs on chemical metering pumps, be sure to
disconnect all electrical connections and insure that all pressure valves are shut off and
pressure in the pump and lines has been bled off.
Always wear protective clothing, gloves and safety glasses when performing any
maintenance or repairs on chemical metering pumps.
ROUTINE MAINTENANCE
1. Routinely check the physical operating condition of the pump. Look for the presence of any abnormal noise,
excessive vibration, low flow and pressure output or high temperatures [when running constantly at maximum
stroke rate, the pump housing temperature can be up to 160°F (70°C)]
2. For optimum performance, cartridge valves should be changed every 4-6 months. Depending on the
application, more frequent changes may be required. Actual operating experience is the best guide in this
situation. Repeated short-term deterioration of valve seats and balls usually indicates a need to review the
suitability of wetted materials selected for the application. Contact the supplier for guidance.
3. Check for leaks around fittings or as a result of deteriorating tubing e.g. when standard white translucent
discharge tubing is exposed to direct sunlight. Take appropriate action to correct leak by tightening fittings or
replacing components.
4. Keep the pump free of dirt/debris as this provides insulation and can lead to excessive pump temperatures.
5. If the pump has been out of service for a month or longer, clean the pump head/valve assemblies by pumping
fresh water for approximately 30 minutes. If the pump does not operate normally after this “purging run”, replace
cartridge valve assemblies.
DISASSEMBLY AND ASSEMBLY
DIAPHRAGM REMOVAL
1. Flush pumphead and valve assemblies out by running pump on water or other suitable neutralizing solution.
Wash outside of pump down if chemical has dripped on pump.
2. Set stroke length of pump to 0% and unplug pump.
3. Disconnect tubing or piping from the pump. Remove the four pumphead screws and then remove the pumphead
assembly.
4. Remove the diaphragm by grasping it at the outer edges and turning it counterclockwise until it unscrews from
the electronic power module (EPM). Don’t lose the deflection plate or diaphragm shims which are behind the
diaphragm. Note shim quantity can be from 0 to 2.
5. Inspect diaphragm if it is intended to be used again. Look for indications of the Teflon face being overstretched,
(localized white areas) or the elastomer on the back of the diaphragm being worn. Excessive amounts of either
condition require diaphragm replacement.
DIAPHRAGM REPLACEMENT