How do I get old motor off pump to install my new motor?

yes it should be a direct swap ask the place you buy the new one from they will know for sure

1) Not likely the timer is problem, unless there was fire or overheating in timer box. Use nose and eyes to inspect for signs of high heat.

2) Eliminate timer as suspect:
Move wires on timer to test if timer relays have gone bad.
Move terminal 4 to terminal 3
Move terminal 2 to terminal 1
http://waterheatertimer.org/How-to-wire-T104-Intermatic-timer.html#T104

3) Check watt rating of Hayward pump, and voltage.
1Hp motor at 240Volt draws 8 amp, and can draw 6 to 8 times that amount when starting. Up to 100 feet, should be at least 12 gauge wire and double-pole 20 amp breaker. Over 100 feet, 10 gauge wire and 30 amp double-pole breaker is best.
http://waterheatertimer.org/Color-codewire.html#motor

4) Intermatic T104 240V timer is rated 40 amps
Can safely handle 1 Hp motor without nearing heat-rating capacity of timer

5) Make sure the motor is wired correctly for 240Volts.
If motor is wired for 120, and 240 is applied, then tripped breaker can result.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

if you buy an adaptor,should be a 1 1/2" dia hole,in the bottom of the skimmer, put it in the skimmer hole,put your vac line on that, turn the valve to it's on full skimmer, it will work,
thats a nice filter,pool guys will sell you anything!
esp at this time of year!
buy the minumum!

Can you be more descriptive? My guesses are that the motor is wired wrong, the motor is defective, There is a leak in the supply line or the pump and air is getting into the pump, causing the pump to cavitate.

Your motor has a thermal protection switch in it the reacts to an overheating condition. Once the motor cools enough it will turn back on. You may be able to have the motor rebuilt for about half the cost of new if it is not damaged to severely. Take it to a local electric motor repair shop for service. If it is damaged beyond repair, you can shop around for a new one. If you would like a quote, contact us at www.arrowpools.net with your pump model number and we can quote it.

The capacitor is probably bad. It's under the cover on the side of the motor, Take a look and smell it. A motor shop has them, or Grainger


If you need further help, I’m available over the phone at https://www.6ya.com/expert/craig_3fa289bf857b1a3c