0042206039002

Melnor

Model # 3900H

Internet # 203134126

Heavy Duty Pulsating Sprinkler

$16.99 /each

FREQUENTLY BOUGHT TOGETHER

PRODUCT OVERVIEW

Model # 3900H

Internet # 203134126

The Heavy metal base of the Melnor 3,900H Heavy duty Pulsating Sprinkler provides a steady platform for watering large lawn areas up to 5,600 sq. ft. The rust proof design will provide years of service.

California residents: see  Proposition 65 information

  • Heavy duty pulsating sprinkler
  • Durable all metal sprinkler head
  • Sturdy metal base
  • Rust-proof

Info & Guides

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SPECIFICATIONS

Dimensions
Coverage Area (sq. ft.) 
85 
Fitting Size 
3/4 
Product Depth (in.) 
7.91 
Product Height (in.) 
5.08 
Product Width (in.) 
8.98 
Details
Base Material 
Die-Cast 
Commercial / Residential 
Residential 
Decorative 
No 
Maximum Pressure (PSI) 
100 
Maximum Spray Distance (ft.) 
42.50 
Motion Sensor 
No 
Returnable 
90-Day 
Sprinkler Base Type 
Stand 
Warranty / Certifications
Manufacturer Warranty 
Limited 7 year 

MORE PRODUCTS WITH THESE FEATURES

Review Rating: 3 & Up
Maximum Spray Distance (ft.): 40 - 50
Brand: Melnor
Price: $10 - $20
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5 Questions11 Answers

Customer Questions & Answers

Heavy Duty Pulsating Sprinkler
Heavy Duty Pulsating Sprinkler

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This question is from Heavy Duty Pulsating Sprinkler
 
4 answers

Is the base metal or plastic?

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mpls, mn
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April 21, 2016
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Asked by
Little Silver, NJ
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May 11, 2016
Answer: 
Metal I didn't want a plastic one this one is solidly built.
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April 25, 2016
Answer: 
Metal base, the extra weight really helps to hold it down.
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April 22, 2016
Answer: 
The base is made of metal.
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April 22, 2016
Answer: 
Yes the base is metal it is made from Zinc.
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This question is from Heavy Duty Pulsating Sprinkler
 
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what would be a few things to check that would cause sprinkler to not return to its starting point?

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May 10, 2015
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Asked by
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June 1, 2016
Answer: 
I don't believe that minimum 20 PSI statement.
First, let's look at how this thing works. The bottom hairpin clips reverse the direction using the bottom slip rings.
Secondly, the moving top counterbalance or swing arm is sprung by the top coil spring and that action is what moves the entire head step wise and then a reverse of the direction. It's a hammer, sort of.
What's the problem? Low water Read More
I don't believe that minimum 20 PSI statement.
First, let's look at how this thing works. The bottom hairpin clips reverse the direction using the bottom slip rings.
Secondly, the moving top counterbalance or swing arm is sprung by the top coil spring and that action is what moves the entire head step wise and then a reverse of the direction. It's a hammer, sort of.
What's the problem? Low water pressure but you can't increase your 45 PSI city water or regulator to 200 PSI to get this thing to reverse.
Let's test the counterbalance arm that cocks of the coil spring.
Look at the exit orifice on the center support tree. This is the direction in this article.
Rotate the top counterbalance to the left. You can't see the orifice now. Water shoots up into the U channel before the balance arm gap. It then shoots across that gap and hits the other outer U channel that is used to cock or determine the amount of spring compression of the top counterbalance spring.
Notice how the water is channeled after the gap to be deflected and to shoot outwards from the sprinkler. That's key to the force of the cocking action! Some of the water hits this "sail" surface after the gap and cocks the spring. Some or most of the water shoots outwards.
When the arm movers to the right, it is cocking the coil spring on the swing arm. When released, it moves the rotation or direction of the water spray. At the end of the travel, it has to have enough power to trip the hairpin to reverse the direction. That's the root cause of the problem; not enough force at either end of sprinkler head travel.
The test. Place a piece of electrical tape across the end of the channel after the gap and at the very end of the swinging counterbalance arm. Extend the tape 1/4" past the left edge of the swing arm channel as viewed looking at the large exit orifice to create a larger "sail" force. Tape the electrical tape to the top (outer) end of the channel on the arm and then wrap the tape along the bottom of the arm also. You have now blocked all the water from shooting outwards after the end of the arm. It has to exert more force on the moving counterbalance swing arm.
Make sure the hairpin is straight down and close to the center support structure and the arm easily reverse by hand.
Turn on the water. After a few helpings of reversing, your sprinkler should now travel back and forth.
Mine did. There are a few fixes for this. You now know the problem is a lack of force or water power to cock the swing arm spring on your unit.
You can install/ glue a wedge or ramp on the inner channel or the outer channel depending on how you need to deflect the water stream direction to create more force. Of course, you can install a block at the end of the swing arm after the gap to increase the force at lower pressure.
You can install a piece of screen across the exit end of the swing arm to stop some but not all of the water traveling outwards. Try a cylinder of screening open at one end and use copper wire to keep it in place at the end of the swing arm.
You could decrease the diameter of the exit orifice but that could be tricky for most people to do. It also risks permanent orifice damage. A smaller aperture will increase the water pressure and thus the velocity. More velocity will increase the momentum force you need but decrease the water flow. There is no free lunch here.
You should be able to figure out the problem now and figure out some type of non-damaging solution.
Newton's Law, force equals mass times acceleration. Black tape created more mass hitting the tape sail at the same flow rate of water. Yo uneed more kinetic energy and mas both.
At a constant 45 PSI and a short hose, my stinking sprinkler will not reverse or even try to reverse by the partial cocking of the spring or be able to rotate the hairpin clips. My unit is not frozen up, full of scale, or have any friction points.
This is a poor design because of the angles of the exit before the gap and the slope after the gap on the swing arm.
NO WAY it will work at 20 PSI. I cut my ball valve off partially off slowly and it had no effect except to lower the water delivery.
Oh yeah. With the tape in place, my sprinkler works perfect as far as back and forth motion and even makes the original sounds on reversing to start a new slower sweep of the water.
Gilmore makes better ball valve shut offs and other stuff but they don't make this type of sprinkler.
Create your own solution.
Stefan Read Less
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Asked by
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May 11, 2015
Answer: 
The pulsating sprinkler requires a minimum of 20 PSI in order to rotate properly - if that is not the problem check the clip on the backside of the head. In order for it to return to its starting point the clip should be down.
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This question is from Heavy Duty Pulsating Sprinkler
 
2 answers

what is the shipping box dimensions

This question is from Heavy Duty Pulsating Sprinkler
Asked by
Miami, FL
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March 26, 2014
i need to know what the size is from the box
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Asked by
Little Silver, NJ
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May 11, 2016
Answer: 
Mine came with a couple items, this is about 10 inches by 5 by 8....just a rough guess sorry recycled the box.
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Asked by
Oak Grove Mo
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June 19, 2014
Answer: 
Just a small box 8" X 12" and its very well packed.
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item melnor # 3900h heavy duty pulsating sprinkler which stores in dallas area carries this product

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none
dallas tx
September 19, 2013
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Asked by
Oak Grove Mo
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June 19, 2014
Answer: 
You can order online from www.homedepot.com or several other companies on line. Home Depot has the best price.
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Asked by
THD Customer Support
Kennesaw, Ga
September 22, 2013
Answer: 
Thank you for your recent inquiry with The Home Depot. This item is an online exclusive and is not available in your local Home Depot store. It can be ordered online and shipped directly to your home or business. For any other questions, please call us at HomeDepot.com Customer Service 800-430-3376.
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CUSTOMER REVIEWS

Rated 3.9 out of 5 by 30 reviewers.
Rated 2.0 out of 5.0 by Not impressed The quality of the materials in this sprinkler does not match my own expectation of "heavy duty." At best it is typical Chinese quality. I will be looking at a local supplier to get something worthwhile. June 16, 2016
Rated 5.0 out of 5.0 by Melnor Heavy Duty Sprinkler I bought two of these and am very impressed so far. Love the fact that they are all metal with no plastic parts to break. This also gives them a heaviness so they stay right where you set them, which is refreshing. They don't leak, can be set to a 360° rotation if desired, and have nice distance. Their less than "premium-brand" pricing is definitely a pro, as well. June 16, 2016
Rated 5.0 out of 5.0 by good product When you need a movable sprinkler, this one (all metal) is a really good one. May 24, 2016
Rated 5.0 out of 5.0 by Excellent not cheap plastic Very nice product. Am pleasantly surprised that it solidly built, metal and covers a nice area of the yard. I plan on getting a second one so that I can get complete coverage. May 11, 2016
Rated 5.0 out of 5.0 by Lays Down the Law I used this for the fourth time today. I wasn't able to use the oscillator today because of wind. I took this one to the front yard and not only did it cut through the wind but it also delivered a really good soaking. I still can't get over the build quality either. This sprinkler really laws down the law. December 21, 2015
Rated 2.0 out of 5.0 by water the grass not me I bought these sprinklers after I had my landscaping replaced. I originally purchased cheaper and all plastic ones but they leaked pretty early on in the watering process. I decided to get heavy-duty metal ones. The metal fittings are great, they don't leak. There are 2 problems, it is very difficult to adjust the distance and spray. On the closest distance setting I still end up having to place them far away so I end up watering the grass instead of being able to direct the water at the plantings. THe other problem is that I end up very wet as I'm struggling to adjust everything. There is a lot of spray back and no way to avoid it. Unfortunately I put my plastic ones back on my hoses today after struggling to try and get the water where I needed it. Don't waste your money. August 25, 2015
Rated 5.0 out of 5.0 by Great sprinkler I like the fact that this sprinkler is very adjustable, pattern, spray and distance. Great for irregular shapes that you want to water. September 22, 2015
Rated 4.0 out of 5.0 by Very good pr0duct for the money I has used this product before and ordered through HD for less money. September 22, 2015
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