Best GX390 pump and reduction gearbox?

Makes sense. (Again!)

So moving forward, leave that direct drive pump and find a reduction gearbox and a suitable pump - just not Udor price.

:+1:t2:

TBH I have been looking into the price of the gear reduction and they are not cheap down here. seems like a much easier and a DIY setup using a belt drive system, buy the components and set it up seems like $50-80 vs $400-700 for a gear box for the same result with more ability to tweak with the belt drive.

IDK maybe I am missing something about belt drives?

Belt drives are by far the most reliable and cheapest to maintain. Gear drives are typically a good deal if you needed a small footprint on your rig.

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Belt Drive is the way to go, Specially with those new cogged belts some systems have now. 0 belt slip

I’m on a Udor gear drive and it’s been great! But eventually those gears will wear out…

Seen the gear drive units.
A couple of months ago on a dealer.
Dont understand why one would like more moving parts, more chances of braking downs and maintenance.
Foot print is almost the same, but not by much

In my case, My set up was sold as a direct drive unit… 18hp b&s and when the direct drive pump went out the gear drive was a simple option, I could have done a belt drive convertion but that option was very expensive… $800ish dollars later I have a 5 gpm unit at 3500 instead of the 4gpm @ 4k so it was a great upgrade… By the time I need new pump/gearbox I have enough funds to get me a new machine with all the bells and whistles

I agree that if you’re buying a new built PW then belt drive is the way to go. If you already have a direct drive pump and want to upgrade your pump rather than buy new…the gear drive pump is as simple as it gets…4 bolts and you’re done. That’s why you see a lot of guys with gx390s make the swap to a 5.5

A few on here have built their PW with new parts using gear drive pumps for much cheaper than if they bought a new belt drive PW. When it comes to reliability there’s no advantages to a gear drive over belt drive…but certain situations shear drive might work out better.

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Sounds good…but the engines still running at 3400 rpms with or without a gear box

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If you changed “engine” to “transmission/transfer case, or rear differential “ in this anology it makes more sense

True…the analogy isn’t perfect and the word transmission would fit better…but one gets the point that a pump running constantly at 3400rpms with that heat build up at 8hrs a day just won’t last that long compared to gear drive/belt pumps.

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