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replacing my air compressor motor
- Thread starter knied1
- Start date
HP is more important but you need to make sure those HP specs are accurate. It's common practice for manufacturers to lie about HP ratings. (comparing running amps will tell a more accurate story)
A 50 RPM speed difference is a nit.
A 50 RPM speed difference is a nit.
Last edited:
Marinegrunt
Well-known member
- Joined
- Jan 7, 2017
- Messages
- 47
You want to make sure the rpm's of your new motor are the same as the old. The pump is designed to run at a certain rpm. As Dave already mentioned a 50 rpm difference is nothing. As he also mentioned hp is just as or even more important. If that pump is designed for a 5 hp a 3 hp is going to bear down to get that pump going. That will cause the motor to wear out at a faster rate. It could even trip the breaker or overload protection when first starting. If the pump is suppose to run with a 5 hp I'd get a 5.
Post your question in the electrical section. I got some great help a few weeks back when I installed and wired my truck 5 hp motor and magnetic starter. Some very knowledgeable electric guys.
Post your question in the electrical section. I got some great help a few weeks back when I installed and wired my truck 5 hp motor and magnetic starter. Some very knowledgeable electric guys.
Last edited:
md21722
Well-known member
Post a picture of the nameplate of your motor.
Generally you need to match HP, frame size, and speed to make the replacement as easy and straightforward as possible.
Some compressors were labeled as "5 HP" but were actually 3.x HP, but most of them were running 3450 RPM motors so I'd guess you need a true 5 HP.
Have a link to the compressor?
Generally you need to match HP, frame size, and speed to make the replacement as easy and straightforward as possible.
Some compressors were labeled as "5 HP" but were actually 3.x HP, but most of them were running 3450 RPM motors so I'd guess you need a true 5 HP.
Have a link to the compressor?
Last edited:
speed bump
Well-known member
What does your motors spec plate say? Pick one close to the the same input voltage, amperage, and RPM as your compressor in the correct form factor and your done.
The Tool Tyrant
ALLIANCE MEMBER
I need to replace my motor on my air compressor.
currently I have a 5 HP 1750RPM motor
but I can buy a 3 HP 1800RPM motor
is the HP or RPM more important when replacing the motor?
I am guessing the RPM, but need to be sure.
Thank you,
1800 RPM would be fine, BUT you would need to run a smaller 'drive' pulley on the motor in order for it to have enough torque to turn the pump, and then you need to be sure that the pump would then be running above the MINIMUM required RPM per the specs. So long answer short...maybe.