That's pretty ingenious! Great job :thumbup:

 

Nice work!

 

Ha, awesome. I considered doing the exact same thing with my backpack sprayer (also an M4), but I ended going all out with a push sprayer + boom.

 

Nice work! You could look into a 12v lithium-ion battery pack to bump the run time back up while keeping the size the same or less.

 

When you build your boom how many nozzles are you planning to use?

 

And I bet the vibrations from the pump give you a lower back massage while you spray your yard...! :lol:

I have seen a lot of shade-tree engineering done on this forum, but this is one of the more well-executed upgrades I have seen yet. You can hardly tell you changed anything, except for that big motor sticking out in the breeze in the back.

I like it. Now you just need to rig up some hot swappable battery changeout setup, and you can knock out your spraying!

 

Well done @Kicker
Interested in what the boom looks like when you get it done. The prototype M4S sent me isn't cutting it.

 

When you build your boom how many nozzles are you planning to use?

Just 2 nozzles, i only have 5k sq ft and some of that space is pretty narrow.

Nice work! You could look into a 12v lithium-ion battery pack to bump the run time back up while keeping the size the same or less.

I'll look into that, thanks.

Well done @Kicker
Interested in what the boom looks like when you get it done. The prototype M4S sent me isn't cutting it.

It's the same one i would imagine. It was a bunch of pieces that you can configure in different ways depending on how many nozzles you want. I opted for only a two nozzle boom because well i'm only spraying 5k sq ft. I followed some of the advice you gave me in a PM and cut the piece between nozzles to length so that the nozzles would be 20" apart and am just running with that.

 

@Kicker
Your recent post reminded me of this build you did. Where did you source the barbs and MPT/barb fittings?
Were there any other parts you had to purchase besides the barbs and hose?

I'm needing more oomph from the M4S so I can spray my roof for mold without having to get up on the roof.
Thanks

 

@Kicker
Your recent post reminded me of this build you did. Where did you source the barbs and MPT/barb fittings?
Were there any other parts you had to purchase besides the barbs and hose?

I'm needing more oomph from the M4S so I can spray my roof for mold without having to get up on the roof.
Thanks

I got all the fittings MPT/barb and barb/barb at Ace Hardware. There selections of fittings and sizes is way better than what i found at Home Depot. The tubing I got from Home Depot although I think I remember seeing it at Ace Hardware as well.

I did not need any other parts with exception of some additional hose clamps for all the extra fittings. Just read what the recommended inlet tubing size is for the pump and get the appropriate fittngs and tubing.

Everything is is pretty much straight forward with the exception of getting it all to fit. I had to switch the locations of the pump and battery from it's original configuration and it's still a really tight fit. Also had to cut a hole in the plastic housing to allow part of the pump to protrude from.

It's a huge improvement for a relatively low cost investment.

Oh, BTW. Trying to use this with the "boom" that was sent from M4S was a disaster. The pressure from the new pump literally blew the boom/wand apart at the connections. i'd press the trigger on the wand and the boom shot off the wand a good 3 feet.

 

@Kicker just curious, How long was your run time with the original battery and did you ever upgrade to a lithium ion battery.

 

@Kicker just curious, How long was your run time with the original battery and did you ever upgrade to a lithium ion battery.

I never upgraded the battery, just the pump.I never tested the max run times with the old pump. The new pump gives me probably 1.5 to 2 hours run time I'd guess. I can do multiple full coverage applications on 5k sq ft without having to charge it.

 

Nice work! If you are still able to get enough run time to finish the job, then that sounds like it's worth the upgrade in flow.

 

You upgrade seeems very well done, thank you for sharing a nice plan.

That said, I wonder if higher battery voltage could have been used with the small pump, like the 19.2volt Craftsman cordless tool batteries or something like that?
Just kind of thinking out loud. I am trying a small pump upgrade on my towable sprayer this year, heck maybe I can try the higher voltage on the old pump first, that way if I roast it no loss.