Capacitor uf rating for pond pump

[JONNYROTTEN]

My pond pump hums but wont start.If I spin the shaft by hand it stays running.The capacitor thats on there is cbb60 25 uf 300vac with 2 wires.I know I can up the volt rating and should keep the same uf.Amazon prime has a 20 uf and a 30 uf.Can I use one of those? Would the larger uf give a little more kick for an aging motor without doing any damage? Also how do I know which way the 2 wires attach to the 2 wires on the motor?
Its plastic so I'm thinking its a starter capacitor and not a run capacitor.
I have never changed or even looked at a capacitor before.

 

[hockeyrounds]

not sure of the ratings, but you want to connect the capacitor to the pump in series (before the pump).

 

[Riot]

You should be fine replacing it with a 30uf as long as the voltage rating is the same or higher. Capacitance values are almost always ballpark, most parts are +-20% of the marked value

 

[passedpawn]

My pond pump hums but wont start.If I spin the shaft by hand it stays running.The capacitor thats on there is cbb60 25 uf 300vac with 2 wires.I know I can up the volt rating and should keep the same uf.Amazon prime has a 20 uf and a 30 uf.Can I use one of those? Would the larger uf give a little more kick for an aging motor without doing any damage? Also how do I know which way the 2 wires attach to the 2 wires on the motor?
Its plastic so I'm thinking its a starter capacitor and not a run capacitor.
I have never changed or even looked at a capacitor before.

Yep. It's likely a starter cap and a little higher capacitance is better than lower. You probably won't notice any difference. The cap is only used to start the motor. Once the motor starts spinning, an internal switch takes it out of the ckt, so it then has no effect.

Like others said, be mindful of the voltage rating and only use equal or greater rating for both voltage and capacitance (uF).