Pump swap fail

So much to my dismay I was under the impression that I could simply remove my 4gpm cat pump and replace it with a 5.5 gpm Gp. No way Jose. I have a pressure pro 4x4 and thought tomorrow I’d be running around 2k psi at 5.5. Big Nope! Let’s see. The pulley didn’t want to come off first. I broke 2 of the 3 bolts using them in the holes to remove it. I sent the gf to the store for grade 8 replacements. Nope! All they had was stainless. Broke those too. Luckily they were easily extracted. Well, after some soak time with penetrating oil while we took yet another Home Depot trip the pulley came off using the jack bolt method.
So I think I’m in business. I have hell mounting the pump as the holes do NOT line up on the aluminum frame from pressure pro. No biggie. I make some marks and drill 2 new holes on the belt side. Ok. Moving along. Not so fast! The pulley hub DOES NOT FIT THE SHAFT. Holy hell! How did I not notice this when removing the hub from the cat pump? Well, I have this job tomorrow so I have no choice but to put it all back as it was. This includes the plumbing I didn’t mention yet. Before starting the pump swap I plumbed the trailer for a buffer. Well, I just put it back to apron fed since I had not yet mounted the drum I was going to use.
Anyway, I guess now I need a hub and pulley for a 1” shaft.
It’s an easy swap they said. Straight forward they said. Lol. It’s like the time they said to LS swap a fox body mustang. 38k later I had it done.

Oh and I figured I’d start it to make sure things were lined up and working right. Couldn’t pull the rope. Hmm. I did had the machine tipped forward so let’s pull the spark plug and see if oil filled the cylinder. Yup! I pulled the plug and pulled the rope. Splat. Covered in oil. Oil and sweat as it was about 90 when I started this job. So I left the plug out and hope that by morning the oil will drain back down.

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If your not mechanically inclined you would have been better off having a shop do the swap for you.

Or scrap the belt drive and went with a gear drive.

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This is a good word of warning, this is why we specialize, and hire the right person for the job.
Just like our clients hire us instead of doing the job themselves.
Some things you’re better off paying someone to do it, it’s called delegating.

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Personally, I would see it as a growth opportunity! :slightly_smiling_face:

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Luckily I consider myself very mechanically inclined. I think I have it licked. I made a few calls and have the bushing I need to swap to the larger shaft on the way. It will be here Monday. Got all of the oil out of the cylinder this am and got it running. Drained the carb too and as expected it too was full of oil. Got my job done this am. Now I’m just waiting on my part Monday and I should be good to go with a larger pump. The hard work has all been done any the pulley should come right off this time around.

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Not to ruin your day but I had a friend with a 5.5 2500psi machine helping me on a project last week and I was kidding him that my helper with my spare Pressure Pro 4/4000 with cat pump was kicking his tail surface cleaning. Then latter that day I used his machine for something and it was just like using my 4. It didn’t shoot any further on a gable I was trying to hit. So later that day during a break, we did a little test. My pressure pro 4 with 300 ft of hose on it was within 1/4" of his in a bucket with him having only 150 ft of hose. We did it twice. He was getting right at 5.5 and we were getting 5.25gpm.
But good luck. Hope it works out for you.

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My 5.5 gear drive gets 6.6 gpm from a bucket test with 200 ft of hose with both a M5DS tip and also an open ball valve. Tested it a few times. It is a world of difference from my 4/4 both in soaping and rinsing. I do notice a little difference in psi with a dirty driveway so I do have to pretreat more often now. Maybe he’s bypassing too much water from unloader not set right???:man_shrugging:

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@Racer my pressure pro belt drive cat 4/4 gets just over 5 also on a bucket test also. Finally swapped it out for one of my others on the truck, world of difference

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Is that with a 13hp engine ?

Yes with 13hp gx390

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Awesome. Hope I manage that flow too

Update. Pump swap is complete. Results: I cant swear I can tell a difference. I’ve only tested it on my driveway so far with the SC.

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That’s probably the only area I didn’t notice much of a difference between 4 and 5.5 was surface cleaning. It was faster but not where I was blown away. Where I did notice a big difference is rinsing after surface cleaning and house washing overall both soaping and rinsing. Much faster. I save about 30-40 min per job now.

I was hoping for it to be more obvious when rinsing with the ball valve after running the SC. I wish I had actually tested the flow on the Cat 4 gpm before the swap

You won’t get full flow with a ball valve unless it is fully open. If you have a small pond or lake near you, toss the ball valve in the center of it. Problem solved.

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lol. I love my valve. One of the best tips Ive gotten here. From rinsing to switching from lance to SC, I use the heck out of it. Also for leaving the flow open during start up of my machine

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Try a bucket test with the ball valve open or a soap tip for 30 sec then just x 2. If you’re coming in at 5.5 and your cat 4 was underated coming in at 5-5.25 you won’t notice much difference. Not sure why I’m getting 6.6gpm with a gear drive with same pump…I wonder it is setting the unloader just right???

I got right at about 5.5 in the bucket. I’ve tried adjusting the unloader with a gauge on it. Didn’t have any effect on an open valve flow rate

My ball valve just adds a pound to the rig… I never use it!

Well you are kind of puny looking. Sure that pound makes a big difference to you. LOL.
I’ve got tears I’m laughing so hard. Just say you don’t like it, not that the pound of weight bothers you.

Not to change the subject, but you started on building that remote for ds injector yet? You get it working I want one or 2. I’ve got 2 of Russ’ and neither has made it consistently a full day yet.

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