Which KEM KOS Oil Skimmer Belt Fits Your Model?
A customer called us this week with a KOS-600SC on his machine and one question: does the KOS-600 belt fit, or is that belt only for the KOS-600S?
It fits. KEM makes one urethane belt for each KOS series, and every urethane belt model in that series uses it. The letters after the number (S, SC, SCB, SCT, SPT, SWT) do not change which belt you need.
Here is the full list so you can check your own model.
Belt compatibility by series
| Replacement belt | Belt width | Belt length | Fits these skimmers |
|---|---|---|---|
| KOS-300 Series Belt | 25 mm (0.98 in) | 263 mm (10.4 in) | KOS-300S, KOS-300SPT |
| KOS-350 Series Belt | 25 mm (0.98 in) | 357 mm (14.1 in) | KOS-350S, KOS-350SC, KOS-350SCB, KOS-350SPT, KOS-350SWT, KOS-351SC |
| KOS-360 Series Belt | 25 mm (0.98 in) | 568 mm (22.4 in) | KOS-360S, KOS-360SCB, KOS-360SPT, KOS-360SWT, KOS-361SC |
| KOS-370 Series Belt | 25 mm (0.98 in) | 683 mm (26.9 in) | KOS-370S, KOS-370SCB, KOS-370SPT, KOS-370SWT, KOS-371SC |
| KOS-600 Series Belt | 65 mm (2.56 in) | 313 mm (12.3 in) | KOS-600S, KOS-600SC, KOS-600SCT, KOS-600SCB, KOS-600SWT, KOS-601SC, KOS-601SCB |
| KOS-650 Series Belt | 65 mm (2.56 in) | 438 mm (17.2 in) | KOS-650S, KOS-650SCB, KOS-650SWT, KOS-651SC, KOS-651SCB |
| KOS-660 Series Belt | 65 mm (2.56 in) | 553 mm (21.8 in) | KOS-660S, KOS-661SC |
| KOS-670 Series Belt | 65 mm (2.56 in) | 668 mm (26.3 in) | KOS-670S, KOS-670SCB, KOS-671SC, KOS-671SCB |
Belt lengths are the values listed in the KEM catalog for each series.
How to find your series
Read the model number on the skimmer nameplate and look at the three digits after KOS. A KOS-600SCT is a 600 series skimmer, so it takes the KOS-600 Series Belt.
Models that end in 1, such as the KOS-601SC or KOS-351SC, use the belt for the series that ends in 0. A KOS-601SC takes the KOS-600 belt and a KOS-351SC takes the KOS-350 belt.
The series number matters. The KOS-600, 650, 660 and 670 belts are all 65 mm wide but differ in length, so order by your exact series.
Two cases where this chart does not apply
Mesh belt (MC) models. Models with MC in the name, such as the KOS-602MC, run a stainless steel mesh belt. The urethane belts above are not for those skimmers. Call us with your model number and we will find the right belt.
Large SC models. The KOS-1002SC, 1012SC, 1032SC and 1052SC use a 100 mm (3.94 in) belt, and the KOS-2012SC, 2032SC and 2052SC use a 200 mm (7.87 in) belt. Each of these has its own belt listed under its own model number.
Changing the belt
Switch off and unplug the skimmer before you start. Then:
- Press pulley C in the direction of the arrow and slip the old belt off pulley A.
- Fit the new belt and put the cover back on.
Each belt page has KEM's diagram showing which pulley is which.
KEM lists 20 to 30°C as the best working temperature for these skimmers. Long exposure to high temperatures can deform a urethane belt, so if your belts wear out quickly, check the coolant temperature.
If the belt looks fine but the skimmer is still leaving oil behind, see Why Your Oil Skimmer Stopped Picking Up Oil.
Still not sure?
Send us the model number from your nameplate or a photo of the skimmer, or call 847-466-5459. IndustryNest is an authorized US distributor of KEM, and we will confirm the belt before you order.