5hp 240 Volt Air compressor Install

alfredeneuman · Mar 4, 2020

If the capacitor is the problem, also check the centrifugal start switch.
You should hear an audible click within a couple of seconds.
Otherwise it is stuck. (and possibly why the capacitor failed in the first place)

pattenp · Mar 4, 2020

The Mars 189-227 250V will be fine.

Terry D · Mar 4, 2020

Dont know if you have a motor shop in town. They would have the capacitors and also be able to check the old ones.

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Bert_ · Mar 4, 2020

Ignore the metal capacitor for now. It is not the cause of a no-start condition. The plastic capacitor is the start capacitor. It doesn't look bad but looks don't mean that much.

What kind of meter do you have? You may be able to perform some tests.

If you do change it remove only one wire at a time and connect it to the new capacitor.

AllThingsOld · Mar 4, 2020

Bert_ said:
Ignore the metal capacitor for now. It is not the cause of a no-start condition. The plastic capacitor is the start capacitor. It doesn't look bad but looks don't mean that much.

What kind of meter do you have? You may be able to perform some tests.

If you do change it remove only one wire at a time and connect it to the new capacitor.

This is the only one I have

Bert_ · Mar 4, 2020

AllThingsOld said:
This is the only one I have

Disconnect the wires from one terminal of the plastic capacitor. Set your meter to ohms probably the 20k ohm scale. Short the capacitor with a screwdriver then connect your meter. The reading should start low near zero and then rise towards infinity.

This is not a really accurate test but it will usually tell you good/bad.

All this is with the power to the motor turned off.

pattenp · Mar 4, 2020

Does the meter have a capacitance setting? This symbol -|(-
Edit:I couldn't tell on my phone but now see the meter doesn't have a capacitance setting.

AllThingsOld · Mar 4, 2020

Bert_ said:
Disconnect the wires from one terminal of the plastic capacitor. Set your meter to ohms probably the 20k ohm scale. Short the capacitor with a screwdriver then connect your meter. The reading should start low near zero and then rise towards infinity.

This is not a really accurate test but it will usually tell you good/bad.

All this is with the power to the motor turned off.

The capacitor tests good.. 0.L

Terry D · Mar 4, 2020

You said in post # 63 that when you powered the motor up, it hummed, and when you pressed the reset button , it then tripped the breaker. If the motor is shorted to ground, it would trip the breaker instantly. Why is it tripping when you press the overload button, that just sounds weird. And you for sure have 240 volts across the 2 line terminals of the motor, not 120 volts And the motor is not locked up? It would be nice to check the caps with a actual capacitor tester. Is there anyway to take the belts off, hand spin the motor in the right direction, and then apply power to it and see if it starts. Make sure your hand is clear, before you apply power.

AllThingsOld · Mar 4, 2020

Terry D said:
You said in post # 63 that when you powered the motor up, it hummed, and when you pressed the reset button , it then tripped the breaker. If the motor is shorted to ground, it would trip the breaker instantly. Why is it tripping when you press the overload button, that just sounds weird. And you for sure have 240 volts across the 2 terminals of the motor. And the motor is not locked up? It would be nice to check the caps with a actual capacitor tester. Is there anyway to take the belts off, hand spin the motor in the right direction, and then apply power to it and see if it starts.

I took the belt off, the pump turns, no issue there. The motor on the other hand, does not budge. Unbelievable... Is there any option other than getting a new motor ?

Terry D · Mar 4, 2020

There is your problem, the motor is locked up. If it is just bearings, they can be replaced. If you have a shop do it, it might just be better to get a new motor depending on the cost. Its not hard to change bearings depending on your skills. Assuming that it is just bearings. I defiantly would be giving the person you bought it from a phone call

AllThingsOld · Mar 4, 2020

Terry D said:
There is your problem, the motor is locked up. If it is just bearings, they can be replaced. If you have a shop do it, it might just be better to get a new motor depending on the cost. Its not hard to change bearings depending on your skills. Assuming that it is just bearings. I defiantly would be giving the person you bought it from a phone call

I did call him, not sure what good it will do, after all he is the guy who told me it ran great, no issues etc.

AllThingsOld · Mar 4, 2020

Any idea where I can find replacement bearings ?

Terry D · Mar 5, 2020

AllThingsOld said:
Any idea where I can find replacement bearings ?

There should be a number on the bearing. They should be available online or if you town has a Grainger. Once you pull the end caps of the motor off, you be able to determine what the problem is, and if it is repairable. There are videos on Youtube on this. At this point, you really cant do it any more harm. It could save you the cost of a new motor.

Norcal · Mar 5, 2020

Another source for bearings is if supplier such as Kaman or other is nearby, but online will probably have better prices, I would avoid ChiCom bearings though.

sberry · Mar 5, 2020

Auto parts stores, tsc has some, I got one there a while back for a motor.
Finding it is ok, know the problem, it's a good fix, new bearings add reliability. It's the price of used.
Nothing wrong with a fresh cap especially at the right price. I have 3 or 4 things that take the same, I stock one.

AllThingsOld · Mar 5, 2020

Here is what I discovered..

sberry · Mar 5, 2020

Its broke. You did the right thing, no substitute for tearing it apart.

sberry · Mar 5, 2020

Anyone know what one similar cost?

wyliesdiesels · Mar 5, 2020

looks like its smoked. someone pulled a fast one on ya!

Terry D · Mar 5, 2020

Its toast

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Terry D · Mar 5, 2020

Probably the only thing good on it, is the bearings

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AllThingsOld · Mar 5, 2020

wyliesdiesels said:
looks like its smoked. someone pulled a fast one on ya!

I blame myself, I’m an idiot for letting the guy delivery and not seeing it run first. Of course he lied to me and said it ran great, but that is my fault for letting him screw me.

alfredeneuman · Mar 5, 2020

It must smell awful by the looks of it

AllThingsOld · Mar 5, 2020

the RPM of the original motor was 3425, should I buy an identical replacement or one that runs around 1725 ? I am so pissed at myself

sberry · Mar 5, 2020

Get past it, buy one that is bolt on ready.

AllThingsOld · Mar 5, 2020

Is this a good motor

Bert_ · Mar 5, 2020

Baldor makes good motors. Also has a 1.15 service factor which is better than the original.

sberry · Mar 5, 2020

It's good and only about 50 bucks more than what come on it, not a bad upgrade.

Terry D · Mar 5, 2020

That would be be good motor

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AllThingsOld · Mar 5, 2020

If anyone has advice, I will take it, but if not I’m just going to get that one coming

AllThingsOld · Mar 5, 2020

Thank you guys for taking the time to walk me through this nightmare, I really appreciate everyone’s input

Terry D · Mar 6, 2020

Let us know how the new one works out

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AllThingsOld · Mar 6, 2020

Is this worth 112 shipped ?

https://rover.ebay.com/rover/0/0/0?mpre=https://www.ebay.com/ulk/itm/352956987779

sberry · Mar 6, 2020

I figured you could get something well under 200, looks like you can. The advantage of a special is they let 5 run from a 10 cable.

Terry D · Mar 6, 2020

The old motot has a 56H frame. This one in ebay has a Y56HZ frame. Make sure it will mount up. There is differences between the two

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justsam · Mar 6, 2020

Check shaft diameter, length, keyway ,etc.

AllThingsOld · Mar 6, 2020

Shaft diameter on the one in the link is 5/8, shaft diameter on current motor is 7/8... Would that be something I could get an adapter for ?

AllThingsOld · Mar 6, 2020

Terry D said:
The old motot has a 56H frame. This one in ebay has a Y56HZ frame. Make sure it will mount up. There is differences between the two

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I found this chart, not sure about the “V” dimension

Terry D · Mar 6, 2020

AllThingsOld said:
Shaft diameter on the one in the link is 5/8, shaft diameter on current motor is 7/8... Would that be something I could get an adapter for ?

I would get the exact motor as the old one. I am not a fan of shaft adapters.

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5hp 240 Volt Air compressor Install

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