Man, honestly you just gotta know concrete. I have neighborhoods where I know the concrete is crap. It’s another reason why I don’t do add ons. My guys may not not if the driveway can be cleaned.
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Fortunately, the driveway was my own. I am just getting my trailer in production. I have a 9-5 job otherwise.
I am testing mixes and surface cleaning on my own two houses first.
I am coming from a 2.1 GPM to a 8 GPM machine with little knowledge in between.
This 22 horsepower took off the top layer of concrete and I was not expecting it.
I will try to get nozzles that take me down to 2500 PSI, is that a safe area for crappy concrete?
I plan to work my own neighborhood with similar driveways, to start
What size is your machine? that sounds like bad concrete. Pretty sure that’s what’s on my machine, I’ll look later today. and have never had a problem. How many feet of hose were you running?
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If what you said above is correct regarding your nozzles size, your machine GPM, and your hose length, you already were at 2300 PSI on that job, just the same as @Kps0410.
8 GPM @ 3500 PSI Pressure Pro machine w/Honda 690 and 225 feet of 3/8 hose.
ordered the 2503 nozzles, four of them, will post results once I get them installed. The 2502s were stripping the cream off the concrete and exposing the aggregate. These were broomed concrete drives. We shall see.
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Do you have a update ?
About to put 25025 on my 4 bar sc ?
the larger nozzles were more forgiving on the softer concrete with adequate cleaning.
I have a 22 horsepower machine and the pressure was too much for that particular type/hardness of concrete.
I have been much more careful since. That post was my first concrete job with new equipment. I was putting like over 3000psi down. Try to size your nozzles to put no more than I would hazzard a guess @ 2500 psi max. residential
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I did pool deck damage again today same setup
8gpm
2502 4 bar ww
200 foot 3/8
Gx690
Lowered throttle a bit
Choked ball valve some to 1900psi
I’ll try the 2502.5
Man this is bad can’t keep this up. This concrete was about 20 yrs old
Then I noticed belt dust (lots)from the poly chain sitting on the pump frame
Don’t lower the throttle. You are killing the engine.
Don’t throttle the ball valve. You are killing the unloader.
Don’t clean concrete that you can damage
Don’t buy a machine with a poly belt. I literally just sold two with barely any hours that a crew bought and didn’t tell me as about.
IB
In your opinion what’s your issue with poly chain?
Changing it?
Other than me tilling concrete with it, I have no complaints yet. I’ll assume the dust was from me lowering the idle and cocking the ball valve I assume never seen it before that job.
Honda udor combo seems bulletproof so far then again I only have 10hrs on it.
You most likely did not damage the concrete. All you have done is exposed what the concrete really looks like when its clean. All new and old concrete has imperfections. You are just exposing them by means of cleaning.
Yeah I didn’t see a slurry but I was stressing I didn’t get to see it dry got cloudy out.
This was a realtor’s house very nice setup.
Take some pics.
The only way your etching or taking layers of 20 yr old concrete off is pretty much sand blasting.
You have a machine with less than ten hours and you have belt shavings/dust? That would be a problem for me.
Only after the last 90 minutes of 3/4 throttle and a choked ball valve it was clean before that.
Didn’t get pics next one I will definitely post up
Was there alot of wobble?
