Is any one else out ther with a Waterways 56 pump replacing them every 3 years also?

The pump motor should have a label on the side of the motor showing a diagram for Common, High speed, Low speed and the right positions for the connections.
Common is always the white wire
High speed is normally red
Low speed is Black
Green wire is always green

Waterway Executive 56 Spa Pump, 5 HP, 230V
Waterway Executive 56 Frame spa pump wet end
assembled to a 56 frame, 5hp, 2-speed 230V spa motor
This Spa pump has a 2-1/2 inch intake and a 2 inch discharge for plumbing
(but measures 3-1/2 inch and 3 inch- see bottom of this page)Manufacturer Part No. 3722021-13 Other Part No. PF-50-2N22C
Features:

• Executive spa pump wet end designed specifically for 56-frame spa motors
• Two double shielded ball bearings with moisture resistant grease for quieter operation and longer life
• Two speed spa motors have four sets of insulated windings for increased efficiency
• 56 frame spa motor for added strength, cooler operating temperature and longer motor life
• Large 2-1/2 inch intake for improved flow performance and reduced noise
• Large 6-1/2" diameter wet end for higher head pressure
• Split capacitor, (start and run) for less energy consumption
• Thermally protected to extend life expectancy of hot tub motor
• Highly versatile wet end can be rotated every 90 degrees
• Viton seals
• Three year manufacture's warranty on spa motor and spa pump wet end

Mercuries have notoriously small waterways in the head and suffer seriously from this problem in salt water.
I cant suggest anything except to strip the motors completely and physically clean out the waterways. Sorry about that.

Thank you for posting your question here on Fixya.com.

There is a seal in there that a local pump repair shop can fix for about $30 - $50 with parts and labor. Waterway pumps use a 1000 seal that is not a seal the homeowner is usually successful at replacing themselves.

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John

first of all you dont say what the problem is with your roof?
how can you tell the pump/valves are corroded unless they have taken them apart?
lastly.if you cant diy.take it to a skoda dealer labour rates are 1/2 that of audi and the parts come out of the same boxes...they also try harder..

Are you holding the motor using the 'flats' on the shaft on the back side?

I have removed lots of impellers - usually I find the center has spun out of the impeller so I use channel locks to remove the hub. All the pumps I take care of are standard thread - might yours be 'backward'?

Try this, get a leather belt and wrap it around the impeller. About a foot from the end, put a stick under the belt. Hold the stick and belt together and try to lever it off that way.

do radiator flush and hope for the best could get part out and if you still have problem do water pump.if it cuts out you might need head gaskets make sure your oil and antifreeze not mixing ..

If you have never replaced the lamp it is most likely to be the problem.Most lamps last 2-3 years under normal use.

on the motor is a label giving the hp and motor specs. there is also a figure on the label showing the wiring for low voltage and hi voltage.
David