[vegie]

I have finally fitted an ARB Compressor in my Grand Vitara. I have also fitted a rear air locker.

I have noticed that every time I use it to pump up tyres, by the 2nd or 3rd tyre, there is quite a bit of moisture coming out of the hose with the air.

Do I need to be overly concerned about this?

Given it only happens after a fair amount of continual running, can I assume that I am not getting the moist air pumped into the rear diff when I engage the air locker?

If this is normal, and not going to cause issues, then I will leave it, otherwise should I install a water trap into the air hose to catch the moisture when pumping up tyres?

Thanks.

[Gwagensteve]

Normal. Don't be overly concerned.

[vegie]

Not going to rust out the inside of rims, or cause issues with rear diff?

[Gwagensteve]

Sounds like you're pretty keen fit a water trap. Go crazy if you want to.

As I said though, there's no point, it's normal and nothing to be concerned about. Your rims are painted inside, and the diff operates at a temperature where in use any moisture is vented through the breather. the internal parts of axle housings will rust just through environmental moisture if they are left to sit for long periods. The tiny amount of moisture introduced by locker activation isn't relevant.

[vegie]

Cool. Thanks for advice.

I will ignore the moisture and move on.

[ZUZUKI]

The moisture is water mist / vapour in the air (humidity) being pressed together by the higher air pressure so it falls out of suspension in the air, forming water droplets.
I don't know where you live, but tropical climates are obviously bad for this.
If you have mounted your air compressor inside the car, you could run the A/C on high, while the compressor is running (engine should be running anyway, to keep the voltage up) - this will make the compressor intake air as cool & 'dry' as it can be, will help the compressor to run a little cooler & produce less moisture.
Rgs, Michael

[TomDK]

One thing though.
Don't let the compressor stay unused for longer periods in moist surroundings. I did that and had to change both bearings. Compressor had seized due to rust.

[30ONA]

Large compressors run oil in them. Can you oil the little ones with a tiny bit of compressor oil every now and then.

[TomDK]

That's what I've done now. Just a tiny drop now and then as you say