One of the most important factors in keeping your diaphragm sprayer pump running is maintaining the proper oil level. In addition to the correct amount, the type of oil used is important as well. In this post, you will find the type of oil and the amount needed for several different Udor, Hypro, and AR diaphragm pumps.
RELATED: Understanding the Different Types of Sprayer Pumps
What Type of Oil is Used in a Diaphragm Pump?
Most manufacturers have a special pump oil formulation that they offer specifically for their diaphragm pumps. These are usually SAE 30 or 40-weight non-detergent oils that will contain special additives that protect against the typical wear factors unique to diaphragm pumps.
How Much Oil Goes in a Diaphragm Pump?
Below is a list of several common diaphragm pumps along with the type and quantity of oil they require. The amounts listed for oil capacity are approximate. In most diaphragm pumps you should fill a crankcase with oil until it shows about halfway up the sight glass. Site glass location will vary depending on the make and model of your pump.
Hypro Diaphragm Pump Oil Type and Capacity
| Pump Model | Oil Capacity | Oil Type | Oil Part Number to Order |
|---|---|---|---|
| 9910-D252 | 13 oz | SAE 30W Non-Detergent | Hypro recommends the use of their oil in all of their diaphragm pumps: Hypro Oil: 2160-0038 |
| 9910-D30 | 18 oz | SAE 30W Non-Detergent | |
| 9910-D303 | 13 oz | SAE 30W Non-Detergent | |
| 9910-D403 | 13 oz | SAE 30W Non-Detergent | |
| 9910-D50 | 36 oz | SAE 30W Non-Detergent | |
| 9910-D503 | 18 oz | SAE 30W Non-Detergent | |
| 9910-D813 | 19 oz | SAE 30W Non-Detergent | |
| 9910-D1064 | 24 oz | SAE 30W Non-Detergent | |
| 9910-D1265 | 42 oz | SAE 30W Non-Detergent | |
| 9910-D1515 | 77.5 oz | SAE 30W Non-Detergent | |
| 9915-DP252 | 24 oz | SAE 30W Non-Detergent | |
| 9915-DP302 | 24 oz | SAE 30W Non-Detergent | |
| 9915-D303 | 20 oz | SAE 30W Non-Detergent | |
| 9915-D403 | 20 oz | SAE 30W Non-Detergent | |
| 9915-DP503 | 17 oz | SAE 30W Non-Detergent | |
| 9915-DP803 | 24 oz | SAE 30W Non-Detergent | |
| 9915-DP1003 | 24 oz | SAE 30W Non-Detergent | |
| 9915-D1063 | 34 oz | SAE 30W Non-Detergent | |
| 9915-D1504 | 42 oz | SAE 30W Non-Detergent | |
| 9915-DP2505 | 110 oz | SAE 30W Non-Detergent |
The Hypro 9910 series is extremely common, however, it was discontinued and replaced by the 9915 series. The same oil is used in both: Hypro Pump Oil 2160-0038.
AR pumps are nearly identical to the Hypro 9910 series. In fact, similar models can use the same repair parts. For example, a 9910-D30 and AR30 are the same and the diaphragms, valves, and o-rings are interchangeable.
AR Diaphragm Pump Oil Type and Capacity
| Pump Model | Oil Capacity | Oil Type | Oil Part Number to Order |
|---|---|---|---|
| AR45 | 13 oz | A/R Premium Diaphragm Pump Oil, SAE 30 Non-Detergent Oil | AR64532D |
| AR70 | 24 oz | A/R Premium Diaphragm Pump Oil, SAE 30 Non-Detergent Oil | AR64532D |
| AR80 | 13 oz | A/R Premium Diaphragm Pump Oil, SAE 30 Non-Detergent Oil | AR64532D |
| AR115 | 32 oz | A/R Premium Diaphragm Pump Oil, SAE 30 Non-Detergent Oil | AR64532D |
| AR120 | 28 oz | A/R Premium Diaphragm Pump Oil, SAE 30 Non-Detergent Oil | AR64516 |
| AR135 | 32 oz | A/R Premium Diaphragm Pump Oil, SAE 30 Non-Detergent Oil | AR64532D |
| AR140 | 28 oz | A/R Premium Diaphragm Pump Oil, SAE 30 Non-Detergent Oil | AR64516 |
| AR160 | 56 oz | A/R Premium Diaphragm Pump Oil, SAE 30 Non-Detergent Oil | AR64532D |
| AR185 | 56 oz | A/R Premium Diaphragm Pump Oil, SAE 30 Non-Detergent Oil | AR64532D |
| AR215 | 98 oz | A/R Premium Diaphragm Pump Oil, SAE 30 Non-Detergent Oil | AR64516 |
| AR250 | 98 oz | A/R Premium Diaphragm Pump Oil, SAE 30 Non-Detergent Oil | AR64516 |
| AR252 | 13 oz | A/R Premium Diaphragm Pump Oil, SAE 30 Non-Detergent Oil | AR64516 |
| AR280 | 98 oz | A/R Premium Diaphragm Pump Oil, SAE 30 Non-Detergent Oil | AR64516 |
| AR410 | 296 oz | A/R Premium Diaphragm Pump Oil, SAE 30 Non-Detergent Oil | AR64532D |
| AR460 | 296 oz | A/R Premium Diaphragm Pump Oil, SAE 30 Non-Detergent Oil | AR64532D |
| AR500 | 154 oz | A/R Premium Diaphragm Pump Oil, SAE 30 Non-Detergent Oil | AR64532D |
| AR560 | 154 oz | A/R Premium Diaphragm Pump Oil, SAE 30 Non-Detergent Oil | AR64532D |
| AR30 | 26 oz | A/R Premium Diaphragm Pump Oil, SAE 30 Non-Detergent Oil | AR64532D |
| AR303 | 15 oz | A/R Premium Diaphragm Pump Oil, SAE 30 Non-Detergent Oil | AR64532D |
| AR40 | 26 oz | A/R Premium Diaphragm Pump Oil, SAE 30 Non-Detergent Oil | AR64532D |
| AR403 | 15 oz | A/R Premium Diaphragm Pump Oil, SAE 30 Non-Detergent Oil | AR64532D |
| AR50 | 36 oz | A/R Premium Diaphragm Pump Oil, SAE 30 Non-Detergent Oil | AR64532D |
| AR503 | 22 oz | A/R Premium Diaphragm Pump Oil, SAE 30 Non-Detergent Oil | AR64532D |
| AR813 | 37 oz | A/R Premium Diaphragm Pump Oil, SAE 30 Non-Detergent Oil | AR64532D |
| AR1053 | 59 oz | A/R Premium Diaphragm Pump Oil, SAE 30 Non-Detergent Oil | AR64516 |
| AR1203 | 59 oz | A/R Premium Diaphragm Pump Oil, SAE 30 Non-Detergent Oil | AR64516 |
| AR1064 | 30 oz | A/R Premium Diaphragm Pump Oil, SAE 30 Non-Detergent Oil | AR64532D |
| AR1604 | 78 oz | A/R Premium Diaphragm Pump Oil, SAE 30 Non-Detergent Oil | AR64532D |
| BHA130 | 89 oz | A/R Premium Diaphragm Pump Oil, SAE 30 Non-Detergent Oil | AR64532D |
| BHA150 | 89 oz | A/R Premium Diaphragm Pump Oil, SAE 30 Non-Detergent Oil | AR64532D |
| BHA170 | 119 oz | A/R Premium Diaphragm Pump Oil, SAE 30 Non-Detergent Oil | AR64516 |
| BHA200 | 119 oz | A/R Premium Diaphragm Pump Oil, SAE 30 Non-Detergent Oil | AR64516 |
Udor Pump Oil Type and Capacity
| Pump Model | Oil Capacity | Oil Type | Oil Part Number to Buy |
|---|---|---|---|
| ZETA 40 | 39 oz | Udor SAE 40W Premium Pump Oil, Non-Detergent | Udor recommends the use of their oil in all of their diaphragm pumps. Udor Oil: 15.5823 You can use any other 30 Weight non-detergent oil. |
| ZETA 85 | 39 oz | Udor SAE 40W Premium Pump Oil, Non-Detergent | |
| ZETA 70 | 20 oz | Udor SAE 40W Premium Pump Oil, Non-Detergent | |
| ZETA 100 | 39 oz | Udor SAE 40W Premium Pump Oil, Non-Detergent | |
| ZETA 120 | 40 oz | Udor SAE 40W Premium Pump Oil, Non-Detergent | |
| ZETA 140 | 40 oz | Udor SAE 40W Premium Pump Oil, Non-Detergent | |
| ZETA 170 | 44 oz | Udor SAE 40W Premium Pump Oil, Non-Detergent | |
| ZETA 200 | 44 oz | Udor SAE 40W Premium Pump Oil, Non-Detergent | |
| ZETA 230 | 90 oz | Udor SAE 40W Premium Pump Oil, Non-Detergent | |
| ZETA 260 | 90 oz | Udor SAE 40W Premium Pump Oil, Non-Detergent | |
| ZETA 300 | 90 oz | Udor SAE 40W Premium Pump Oil, Non-Detergent | |
| ZETA 350 | 155 oz | Udor SAE 40W Premium Pump Oil, Non-Detergent | |
| ZETA 400 | 155 oz | Udor SAE 40W Premium Pump Oil, Non-Detergent | |
| IOTA 18 | 7 oz | Udor SAE 40W Premium Pump Oil, Non-Detergent | |
| IOTA 20 | 7 oz | Udor SAE 40W Premium Pump Oil, Non-Detergent | |
| IOTA 25 | 7 oz | Udor SAE 40W Premium Pump Oil, Non-Detergent | |
| KAPPA 7 | 4 oz | Udor SAE 40W Premium Pump Oil, Non-Detergent | |
| KAPPA 15 | 4 oz | Udor SAE 40W Premium Pump Oil, Non-Detergent | |
| KAPPA 18 | 4 oz | Udor SAE 40W Premium Pump Oil, Non-Detergent | |
| KAPPA 25 | 12 oz | Udor SAE 40W Premium Pump Oil, Non-Detergent | |
| KAPPA 32 | 20 oz | Udor SAE 40W Premium Pump Oil, Non-Detergent | |
| KAPPA 43 | 20 oz | Udor SAE 40W Premium Pump Oil, Non-Detergent | |
| KAPPA 55 | 23 oz | Udor SAE 40W Premium Pump Oil, Non-Detergent | |
| DELTA 40 | 20 oz | Udor SAE 40W Premium Pump Oil, Non-Detergent | |
| DELTA 75 | 23 oz | Udor SAE 40W Premium Pump Oil, Non-Detergent | |
| DELTA 100 | 40 oz | Udor SAE 40W Premium Pump Oil, Non-Detergent | |
| DELTA 125 | 69 oz | Udor SAE 40W Premium Pump Oil, Non-Detergent | |
| DELTA 140 | 54 oz | Udor SAE 40W Premium Pump Oil, Non-Detergent | |
| DELTA 170 | 67 oz | Udor SAE 40W Premium Pump Oil, Non-Detergent | |
| OMEGA 140 | 87 oz | Udor SAE 40W Premium Pump Oil, Non-Detergent | |
| OMEGA 170 | 91 oz | Udor SAE 40W Premium Pump Oil, Non-Detergent | |
| BETA 130 | 81 oz | Udor SAE 40W Premium Pump Oil, Non-Detergent | |
| BETA 170 | 91 oz | Udor SAE 40W Premium Pump Oil, Non-Detergent | |
| BETA 200 | 170 oz | Udor SAE 40W Premium Pump Oil, Non-Detergent | |
| BETA 240 | 170 oz | Udor SAE 40W Premium Pump Oil, Non-Detergent |
Udor does provide an alternate oil option if you do not have Udor brand pump oil handy. You can use any SAE 30-weight, non-detergent oil.
When to Change Diaphragm Pump Oil?
Just like with a car diaphragm pumps have a crankcase, cylinders, and pistons that require lubrication. oil needs to be changed periodically to prolong the life of your pump. When a diaphragm pump is operating it creates heat and friction. Without new oil, the wear from friction and heat is more severe.
How often you change the oil varies slightly depending on the manufacturer of the diaphragm pump but in general, it is recommended that you change the oil every 500 working hours or three months whichever comes first.
The diaphragm in the pump is what separates the fluid that you are pumping and the oil in the crankcase. If the diaphragm is damaged or worn out then the oil and the chemical you are spraying will mix. This means that oil and your pump will get pumped down along with your spray solution. It also means that my chemical and your spray solution will be present inside the crankcase. This can cause damage to the cylinders, pistons, connecting rods, etc.
If you notice the oil in the sight glass is cloudy or milky and color when it is time to change diaphragms and change the oil. Whatever you change diaphragms you should flush out the crankcase with fresh water and refill it with new oil.
New Pump Oil
Some pump oil manufacturers add a colored dye to their oil. This may cause the oil to look darker and not like new oil. Example: Hypro pump oil has a green dye added to it.
Tips on How to Change Diaphragm Pump Oil
Drain the pump completely of the remaining water/spray mixture and oil. Remove the heads to replace the diaphragms. Flush out the crankcase. When you fill the pump with oil, rotate the pump to get all the air pockets out of the pump. The oil level in the sight glass will go down as you turn the pump. Add oil as you turn the pump until it is at the proper level and no more air bubbles are coming out.
More Information on Diaphragm Pumps
If you are new to diaphragm pumps you can find resources for building sprayers and troubleshooting diaphragm sprayer pumps here: