1. Introduction
This manual provides essential information for the proper installation, operation, and maintenance of the Moisture Boss MK-75 Kaeser Oil-Water Separator Service Kit. This aftermarket kit is designed as a direct replacement for Kaeser part number MK-75, ensuring compatibility and performance for industrial compressed air systems.
The service kit is crucial for maintaining the efficiency and longevity of your oil-water separator, which is vital for environmental compliance and proper condensate management.
2. Safety Information
Always observe the following safety precautions when handling, installing, or maintaining the service kit components:
- Ensure the compressed air system is depressurized and locked out before beginning any service work.
- Wear appropriate personal protective equipment (PPE), including safety glasses and gloves, to prevent contact with oil, water, or other contaminants.
- Dispose of used components and separated oil/water mixtures according to local environmental regulations.
- Refer to the original equipment manufacturer's (OEM) manual for the oil-water separator unit for specific safety guidelines and procedures.
- Do not attempt to modify the service kit components. Use only as directed.
3. Product Components
The Moisture Boss MK-75 Kaeser Oil-Water Separator Service Kit includes the following components:
- 1 x Prefilter
- 1 x Carbon Element
- 3 x Coalescing Foam Pads

Figure 3.1: Carbon Element. This component is designed to absorb residual oil from the condensate, ensuring clean water discharge.

Figure 3.2: Coalescing Foam Pads. These pads facilitate the separation of oil from water through a coalescing action.
4. Setup and Installation
Follow these general steps for installing the service kit. Always consult your specific Kaeser oil-water separator manual for detailed, model-specific instructions.
- Preparation: Ensure the oil-water separator unit is isolated from the compressed air system and depressurized. Drain any remaining condensate from the unit.
- Access: Open the housing of the oil-water separator to access the existing filter elements and foam pads.
- Remove Old Components: Carefully remove the used prefilter, carbon element, and coalescing foam pads. Dispose of these components responsibly according to local hazardous waste regulations.
- Clean Housing: Clean the interior of the separator housing to remove any sludge or debris.
- Install New Components:
- Insert the new coalescing foam pads into their designated slots.
- Install the new prefilter.
- Place the new carbon element into its compartment.
- Reassemble: Securely close the separator housing, ensuring all seals are properly seated.
- Test: Slowly re-pressurize the system and check for any leaks. Monitor the separator's performance to ensure proper oil and water separation.
5. Operation
Once the service kit is installed, the oil-water separator will resume its function of separating oil from compressed air condensate. The prefilter removes larger particles, the coalescing foam pads cause oil droplets to combine and separate from water, and the carbon element polishes the water by adsorbing any remaining oil traces before discharge.
Regular monitoring of the separator's discharge quality is recommended to ensure optimal performance and compliance with environmental standards.
6. Maintenance
The service kit components have a finite lifespan and require periodic replacement to ensure the continued efficiency of your oil-water separator. The replacement frequency depends on the volume of condensate, oil concentration, and operating conditions.
Recommended Replacement Schedule:
- Prefilter and Coalescing Foam Pads: Typically every 6-12 months, or sooner if performance degrades.
- Carbon Element: Typically every 12-24 months, or sooner if oil is detected in the discharge water.
Replacement Procedure: Refer to Section 4, "Setup and Installation," for the steps to replace the components. Always use genuine Moisture Boss replacement kits to ensure compatibility and performance.
7. Troubleshooting
If you encounter issues with your oil-water separator after installing the service kit, consider the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Oil in discharge water | Saturated carbon element or foam pads; improper installation; excessive oil in condensate. | Replace carbon element and foam pads; re-check installation; investigate upstream oil source. |
| Slow condensate drainage | Clogged prefilter or coalescing pads; blocked drain line. | Replace prefilter and foam pads; clear drain line. |
| Leaks from housing | Improperly seated seals; damaged housing. | Check and reseat seals; inspect housing for damage. |
If problems persist, contact Moisture Boss customer support or a qualified service technician.
8. Specifications
| Attribute | Detail |
|---|---|
| Model Number | MK-75 |
| Compatibility | Direct replacement for Kaeser part number MK-75 |
| Kit Contents | 1 Prefilter, 1 Carbon Element, 3 Coalescing Foam Pads |
| Product Dimensions | 330.2 x 330.2 x 330.2 inches (This dimension seems unusually large for a service kit, please verify with product packaging if exact dimensions are critical.) |
| Item Weight | 16 Pounds |
| Manufacturer | Aftermarket (Moisture Boss) |
| ASIN | B07Q47CXDF |
9. Warranty and Support
This Moisture Boss product is guaranteed to meet or exceed the specifications of the OEM brand. Product warranties are provided by the manufacturers we represent and may vary. For specific warranty details pertaining to your MK-75 service kit, please contact Moisture Boss directly.
For technical support, inquiries, or to purchase additional service kits, please visit the official Moisture Boss website or contact their customer service department. Always refer to the product's ASIN (B07Q47CXDF) when seeking support.
Moisture Boss Contact Information:
- Website: Visit the Moisture Boss Store on Amazon
- General Inquiries: Refer to contact options on the Moisture Boss website.