SPRINKLER TALK FORUM - You Got Questions, We've Got Answers

Does anyone know how to disassembly a I-20 down to the gears . I broke something in the upper rotor part and removed the rubber cover to see what it was , but there is still a lot to come off , before you can get inside of the head . I have replaced the head and just wondered if the head can be taken completly apart or do I just mechanically force it open .

Thanks for the response . Can the spring be replaced ;since , it is shown as a separate part on their parts list . If it can be replaced , how do you take it off and then put a new one on the rotor assembly .

Thanks for the explanation on how Hunter assemblies the I-20 . I will stop figuring out how to take it apart .The spring is not broken . The normal way to show a parts list is to picture those parts that are replaceable as individual items or assemblies and give only those a part number . I 'm still curious on what I broke and will now mechanically force it open . Thanks again for you knowledge and explanation .

You were right about the gear . There are very small gears inside the unit . I can see why they use a ultrasonic process to assemble the head assembly , because you would never be able to align and keep the gears in place without it , unless you used machined stainless screws , but this would cause the sprinkler heads to be about $200 a piece and not make much sense in todays competitive market place .I used a PVC cutter to slice the unit in 5 sections to see how it worked . I 'm always amazed at the engineering and manufacturing processes that are used to produce items . This sprinkler is an excellent example of those processes .