[BobRoss]

Thanks @Ware! You could not have explained it better!

 

[cnet24]

I've been researching and looking for feedback for those that have used the 2 or 3 nozzle boom with the 20v version (not the 24v). I've seen some comments from @adgattoni as well as @N LA Hacker, but wanted to see if there were others that use this mod.

Which is better for the 20v, the 2 or 3 boom? I would obviously prefer the 3 boom as I want to maximize my spraying area, but can't determine if there is enough of a flow rate for this.

Also- if using a 2 nozzle boom, I have gathered that I will need to buy new TeeJet nozzles (I currently use the ones suggested by @Ware), as it seems the flow rate will be affected enough to change nozzles.

Lastly, I am currently using the dfw wand on my sprayer- am I able to attach these booms to that wand?

 

[g-man]

@cnet24 I think both the 20v and 24v have the same 12v pump inside the unit, a dalavan. They must be stepping down the voltage to 12v, but the output (gpm)should be the same.

 

[cnet24]

Went to spray today and my unit will not pump. Changed batteries (I have a backup) and had a similar result. Verified that both batteries are charged and no clogs in either the tank filter or the wand filter. Anyone have ideas on how to fix before I call Chaplin? Unit is only 2 years old

 

[440mag]

Oh man, I am sorry to hear about THAT (I literally have NIGHTMARES about that happening)!

Don't hold me to it but IIRC - up thread - another member (or two) posted some dissections they did in troubleshooting problems; that is all I can offer.

(All the woes posted about the 20v models is THE main reason I went with the 24v model (but, I still have those nightmares)!

Troubleshooting on page 9E is typically cursory at best https://cdn.shopify.com/s/files/1/0261/9529/6338/files/63985_Manual_016224_R0918.pdf?1610

but, can't help but wonder if a wife is loose between battery and pump or a solder broke or something similar?

 

[440mag]

CNET, check out this awesome post - with photos - by member "doanster" at bottom of page 8 this thread; hope it helps you (like I said I think there may be some others like doansters):

In troubleshooting issues with my 2 chapin 20v backpack sprayers i have learned some things i want to pass along.

These sprayers use Delavan pumps but the open cage motors and control boards are provided by chapin.
There appears to be a couple of different configurations as my 2 sprayers had different suction connectors and different pressure switches.

I have had to troubleshoot both sprayers. Both initially worked great but started having issues after about 10-15 hrs of use.
One had a sudden reduced pressure at the tip with the motor working hard to try and pump - the other started pulsing (oscillating high pressure / low pressure at the tip).

In both cases - i first thought it may be the pressure switch - it was not. After confirming on both sprayers that the hose, trigger, wand spray tip were clear of any obstructions - i took the pump sides off (7 screws)(do both sides). In both cases i found little pieces of black rubber caught in the inlet /out valves of the pump. there was nowhere that i found damage in the pump itself or a place where the rubber came from. I would be guessing when i say that it may have come from the inlet tube or un-trimmed rubber from a diaphram.

Once i removed the rubber pieces - closed everything back up and re-assembled - ran the sprayer with just water. Problems cleared up almost immediately.

Another discovery during this is in regards to adjusting the pressure of the pump. Chapin indicates that these are fixed pressure pumps. In both sprayers - once the covers are removed ( that houses the battery and the on /off button - you are looking at the pressure switch - on one - right in the cover - is a hole that provided access to a small Allen key set screw - that screw controls the tension on the spring that actuates the pressure switch plunger.
On the other sprayer that same key hole is located under the cover but has a philips screw.

I did some testing on both - adjusting the screw out reduced the pressure at the tip - but depending on the tip - reducing it to low would provide an undesirable spray pattern.
adjusting the screw in increased the pressure but there is a sweet spot where the motor cant keep up with the pressure setting and after letting go of the sprayer handle the motor still runs to try and increase the pressure.
Where it is by default is the sweet spot in my opinion.

I actually drilled a hole in my bottom cover directly above where the pressure switch screw is located (note - is is not dead center of the cover!) so i could adjust by just removing the battery and sticking an Allen key up in - covered the hole with electrical tape to prevent water and dirt from getting up in.

Wanted to pass this info along and hope it helps others.

 

[440mag]

Also this one by 95mmrenegade on page 10:

I am having the same problems, Chapin sprayer has no power. Battery is fully charged, I tried to jumpstart battery with another but that did not work. I mixed a gallon of insecticide and I hate that I may have to open it up and check for clogging like everyone else. I will stop the humid acid application via sprayer and find another route because of possible clogging issues. I will also call Chapin tomorrow. This sucks. :|

Sorry to hear about this.
Have you verified the battery has 20v with a multimeter
Pulled both screens(wand and tank) to verify they are clean

If those are good...
Turn the sprayer upside down on a bucket and remove the t clamp that holds the bottom bucket on place
Remove the + and - from the switch and use some wire to hook the wires directly to the battery to determine if the switch is bad

If that doesn't fix it then remove the motor with the 2 screws on each side then remove the 7 screws on each side to clean it out.

When I spray Humic or something that could possible clog. I pull the filter at the wand.

I feel like spraying with a backpack sprayer will require some maintenance similar to spraying with paint gun.

Annnnnd, this . . . . .

One thing I read is there are a couple possible causes

1) there is a board in the battery and of the board gets wet, you will have issues
2) there are 5 cells in the battery and if one gets out of balance it can also cause problems.

 

[440mag]

cnet, this is the one I recalled, bottom of page 14:

Got through half my yard today with Prodiamine and the pump began to pulse, then quit altogether. Tried to troubleshoot it for about an hour and then gave up. I dumped the remaining 2 gallons into a hand can and finished up.

I started taking the sprayer apart and had two things go wrong on me. The connection in the bottom right was a bit fouled with grime. I unhooked it, brushed it up and cleaned it. The black ground wire was disconnected and bent at a right angle. After messing with it for a while, it broke off and I had to solder it back together. I soldered the red wire as well for good measure.

Page 15 addl:

I got everything put back together and it ran for a short time period and kicked back off. I took everything back off today and soldered a few more connections, cleaned everything, tightened all the hose clamps, etc. It's running now, but pulsing almost constantly. I believe it's because I had taken out the pressure switch screw not knowing what it did. When putting it back together, I kept it as far out as possible with the cap still sitting tight. Will get back into it tomorrow to tighten it down, testing it at different levels. That should raise the pressure it will hold and should stop the pulsing (hopefully).

 

[440mag]

Last but not least this (hope you're so lucky this is it!

Ok, now my pressure has dropped too low even with a fully charged battery and 1.5 gallons in it. Even flipping it upside down doesn't always resolve it.

@Green did you check the filters? Mainly the one at the wand?

 

[cnet24]

Thanks @440mag, I remember that being mentioned in this thread but couldn't find it.

I called Chapin and they will not replace the unit due to warranty, which is fair. They asked me to fill it with water and let it sit overnight and try and spray again today without the wand for max PSI. I guess I'll try that and go into the pump if that doesn't work.

Edit: The fix outlined above actually worked for me. Must have been something vacuum related as I went to remove my Tee-Jet adapter which let out any pressure. Started spraying and it worked fine. Must have just been air in my line.

 

[krusej23]

For those of you that purchased the Chapin 20v from Walmart on super clearance last fall, the 63985 model is what you should look for if you are looking for parts. Couldn't find the 63101 referenced anywhere but Walmart so I emailed Chapin support after finding out this spring that my wand had a bunch of little slices in it that caused it to leak when using it for the first time. They are sending me a new one but haven't heard about any tracking or anything yet. This was the ladies response when asking about what to look for model wise when looking for parts.
"The 63101 is a Walmart unit, our Chapin model similar to this would be 63985."

 

[bosox_5]

Does anyone know of a good way to clean the filter in the wand? I was spraying today and it kept losing pressure. I pulled apart the wand and the filter was clogged up with bits of grass and dirt. I can't get it very clean. Also, I have been experiencing a new issue where the pump doesn't come on right away when the switch is turned on. Any ideas? Thanks

 

[440mag]

Hi, bosox! I regret I am clueless as to any delay in the pump coming on although: a) I'd suspect a connection either loose or with moisture in it / on it (if you can get any connections dry using say, a hair dryer on low heat then maybe coat the connection liberally with an appropriate grease?); and, b) hopefully the delay is connected to the clogged filter (ie., pump sensing too much pressure, maybe?)

Clogged filters is something I have experience with and it was so frustrating I am now super careful NO foreign matter makes it's way into my tank. If soap and hot water and a toothbrush doesn't get it out I'd suspect you're dealing with more than just bits of dirt and grass. Any chance you have bits of dirt and grass caught in dried chemicals? Some chemicals can turn into an epoxy-like substance when they dry but, I am not sure I'd try to use any type of solvents. Have you tried soaking the filter overnight, perhaps in a soapy solution of really hot water?

 

[bosox_5]

Took everything apart in the wand. Looks like the delay was from that stupid screen filter in the wand. From re-reading this whole thread I am betting that is what is causing most people's issues. It needs to be very clean for the pump to work correctly.

 

[440mag]

Glad you got it worked out, bosox!

I helped a neighbor and we finally deduced his sprayer was getting all manner of crap in it (even bits of mulch! :-O ! because he insisted on doing his tank filling and mixing out in his yard ... once we devised a way for him to stop picking his hose end up out of the dirt and holding it over the opening in hi tank his problems went to nil.

I don't know what I'd do if I did not have a concrete area to do my mixing, etc. I'd probably use a 4x8 sheet of plywood or spread some gravel at the very least. It just so happens that lifting the field tank onto the back of my pickup tailgate and then getting into the shoulder straps found me on the (relatively) clean concrete from day #1

 

[AZChemist]

@cnet24 I think both the 20v and 24v have the same 12v pump inside the unit, a dalavan. They must be stepping down the voltage to 12v, but the output (gpm)should be the same.

Anyone have photos of the actual step down or part # ? Thanks.

 

[g-man]

I don't have pictures. I remember looking at it one time when I took the cover off. I think it was a resistor. Since they know the current draw from the pump, it would be a cheap way to do that.

What are you trying to do?

 

[Gilley11]

Below is what I would use. It's sealed so it's waterproof and won't be sensitive to being bumped around. It's rated for 20A, so if you're going to use a bigger pump it'll handle it.

https://www.amazon.com/Nextrox-Converter-Regulator-Transformer-Waterproof/dp/B00BWKXTUU

 

[Biggylawns]

I ordered the "Chapin Shut-off Assembly - Poly With Gauge (6-8175)" for my Walmart 20 volt and it won't thread properly to the wand nor the hose. Anybody else experience this issue?

I put the original handle back on both to make sure I cross thread it and it went on without issue.

 

[krusej23]

I ordered the "Chapin Shut-off Assembly - Poly With Gauge (6-8175)" for my Walmart 20 volt and it won't thread properly to the wand nor the hose. Anybody else experience this issue?

I put the original handle back on both to make sure I cross thread it and it went on without issue.

You need this part....https://www.domyown.com/chapin-68138-premium-sprayer-shutoff-handle-p-1905.html
The one you ordered is for this sprayer....https://www.domyown.com/chapin-treeturf-pro-backpack-sprayer-62000-p-1274.html
I have the same sprayer as you and you need to look for parts that work with the Chapin 63985 sprayer.