Sprayer Depot Blog

Udor Kappa series pumps offer reliable, high-quality and popular solutions when working with harsh chemicals. Due to their anodized aluminum construction, they are ideal for handling a number of common of professional chemicals, such as herbicides, pesticides, liquid fertilizers, de-icing materials, and other hard-to-handle fluids. 

One of our top sellers is the Udor Kappa-43 diaphragm pump. This is a commonly used pump in various horticulture, agricultural, lawn care, nursery, pest control and turf spraying applications. Let's take a closer look at some of its best features!

 

Probably the most common issue we see with this type of pump is a diaphragm rupture. Fortunately, this is a pretty easy repair you can do yourself to save time and money. Continue reading below for steps on how to repair a Udor Kappa-43 Diaphragm pump and watch the easy instructional video that follows.

 For this project you will need the following tools:

• A screwdriver
• Wrench
• 1/2" socket
  
• 11/16" socket
• Diaphragm kit (3 piston diaphragms, 6 sets of O-rings)

Let's get started! Follow these steps:

1. Loosen the bolts on one of the 3 head assemblies
2. Remove the head assembly
3. Remove the diaphragm, nut, and washer
4. Remove the diaphragm
5. Remove the sleeve, and drain the internal oil
6. Loosen the bolts on the 2nd head assembly
7. Remove the head assembly
8. Remove the diaphragm, nut, and washer
9. Remove the diaphragm
10. Remove the diaphragm sleeve
11. Repeat this process on the remaining head
12. Clean the inside of the pump with carb or brake cleaner
13. Replace the sleeve, lining up the holes on the sleeve with the holes on the piston
14. The diaphragm has a beveled side; this side will be pointing out
15. Replace the diaphragm, nut, and washer; tighten with a wrench
16. On each side of the 3 outer head assemblies remove the inside of the valve cage, replace the spring, small seat (beveled side down), and large metal seat
17. Place the valve assembly back onto the head and replace the O-ring with a new one
18. The other side has the same pieces in the opposite order
19. Replace the spring, seat, and large seat
20. Replace the O-ring with a new one
21. Repeat this process on all 3 head assemblies
22. Replace the head assembly
23. Tighten the assembly skipping bolts in a clockwise pattern to evenly tighten
24. Replace the piston sleeve on the 2nd side
25. Replace the diaphragm with the beveled side out
26. Replace the diaphragm, washer, and nut; tighten with a wrench
27. Replace the 2nd head assembly, tightening the bolts with a wrench
28. Using non-detergent 40W pump oil; fill the open side of the pump to the brim
29. Replace the final piston sleeve, lining up the holes with the piston
30. Clean off excess oil  Replace the final diaphragm
31. Replace the diaphragm, washer, and nut; tighten with a wrench
32. Replace the final head

Do you have an instructional video you'd like to see featured? Let us know in the comments below.

 

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Our Repair Technicians are the best! Yes, we are proud of their excellent service and extensive knowledge in all things sprayers. They are quick to diagnose issues and repair them in no time. They work hard five days a week to make sure your downtime is minimal. Usually, repairs are done within the same day unless we need to order parts or if we have a long queue for the day. Even then, most repairs only take 24-48 hours.

If you've visited our website or follow us in social media then you know we have many instructional videos available. For all of our customers who are not local thus unable to stop by for a repair, we thought it would be cool to have short, easy and convenient videos featuring some of the most common repairs that you can do right at home.

Today we are featuring steps on how to repair a Udor Kappa-40 Diaphragm pump. Watch the video and follow the easy steps outlined below.

 For this project you will need the following tools:

• A screwdriver
• Wrench
• Half inch socket
  
• 11/16" socket
• Diaphragm kit (2 diaphragms, 2 sets of O-rings and an air accumulator diaphragm)

Let's get started! Follow these steps:

1. Loosen the bolts in one of the two head assemblies to remove it
2. Remove the diaphragm nut and washer using the wrench
3. Remove the diaphragm
4. Remove the piston sleeve
5. Drain the internal oil
6. Loosen the bolts on the second head to remove it
7. Perform steps 2-5 for the second head 
8. Clean both sides of the pump with break cleaner
9. Place the piston sleeve back in place in one of the two heads
10. Place the diaphragm inside. The diaphragm has a beveled side which needs to be facing up
11. Use the wrench to tighten the nut and washer back into place
12. On each of the two head assemblies remove the inside valve assemble
13. Replace the spring, valve seat (beveled side down), and large metal seat
14. Replace O-ring with a new one
15. The other valve assembly has the exact same parts but reversed (follow steps 13-14)
16. Switch to the other head and perform steps 13-15 for this side as well
17. Place the head assembly back in place on the side where you replaced the piston sleeve (step 9)
18. Tighten bolts in a clockwise pattern to tighten evenly
19. Switch to the other head and use non-detergent 40 weight pump oil to fill that open side
20. Place piston sleeve back in place
21. Clean up any excess oil
22. Replace diaphragm, making sure that beveled side is facing up just like in step 13
23. Use the wrench to tighten the nut and washer
24. Place the head assembly back in place and tighten screws in clockwise pattern to tighten evenly   
25. There is a clear bolt on the side of the pump and the oil level should be visible right in the center
26. Remove the air accumulator head by loosening the bolts
27. Once opened, remove the air accumulator diaphragm and replace with new
28. Close everything back and tighten for a secure fitting

You are all done!  We sell all the parts featured in our videos so just contact us if you have any questions on this repair or the specific parts you need to order. Do you have an  instructional video you'd like to see featured? Let us know in the comments below.

 

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