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Karcher 4.730-168.3 Complete Water Filter Assembly for Professional Pressure Washers

Karcher Part Number: 4.730-168.3
Product Description: Water Filter Complete
Previous Part Number: 4.730-168.0
Manufacturer: Karcher
Equipment Type: High Pressure Washer / Pressure Washing Pump
Equipment Model: HD 9/20-4

Genuine Karcher Water Inlet Filter Assembly

The Karcher 4.730-168.3 Water Filter Complete is a replacement water filtration assembly designed for compatible Karcher professional high-pressure cleaning equipment.

This water inlet filter helps protect the pressure washer pump by capturing dirt, sediment, rust particles, sand, and other debris that may be present in the incoming water supply.

Filtering incoming water helps reduce the possibility of abrasive particles entering the high-pressure pump, where contamination can contribute to premature wear of internal pump components, valves, seals, and related parts.

The Karcher 4.730-168.3 complete water filter assembly is intended for replacement of the corresponding original filter assembly on compatible equipment.

Product Specifications

Compatible Karcher Pressure Washer Equipment

The Karcher 4.730-168.3 water filter is used on selected Karcher professional high-pressure washers, including equipment within the HD and HDS product families.

Referenced equipment:

• Karcher HD 9/20-4 High Pressure Washer
• Selected Karcher HD Professional Cold Water Pressure Washers
• Selected Karcher HDS Professional Hot Water Pressure Washers

Important: Karcher manufactures multiple equipment versions and configurations. Compatibility should be verified using the complete equipment model number, machine serial number, and original equipment parts diagram before ordering.

Benefits of Maintaining a Clean Water Inlet Filter

• Pump Protection: Helps prevent dirt, sand, and other foreign particles from entering the pressure washer pump.
• Reduced Component Wear: Helps minimize abrasive contamination that can damage pump seals, valves, and other internal components.
• Reliable Water Supply: A properly maintained filter helps maintain unrestricted water flow to the pump.
• Preventive Maintenance: Regular filter inspection and cleaning can help reduce unnecessary pressure washer repairs.
• Equipment Longevity: Proper inlet water filtration supports the long-term operation of professional pressure washing equipment.

When Should a Pressure Washer Water Filter Be Replaced?

Inspect the water inlet filter periodically, especially when operating pressure washing equipment with water supplied from storage tanks, wells, or other sources that may contain sediment.

Replacement may be necessary when:

• The filter housing is cracked, damaged, or leaking.
• The filter element is damaged or cannot be adequately cleaned.
• Water flow remains restricted after cleaning.
• The filter assembly has damaged threads or sealing surfaces.
• The original filter assembly is missing or deteriorated.

Installation and Maintenance Recommendations

1. Turn off the pressure washer and disconnect the incoming water supply.
2. Release any remaining system pressure according to the equipment manufacturer's instructions.
3. Locate the original water inlet filter assembly.
4. Remove the existing filter and inspect the connecting fittings and sealing surfaces.
5. Install the correct replacement filter assembly, following the manufacturer's instructions.
6. Reconnect the water supply and check for leaks.
7. Confirm adequate water flow before operating the pressure washer.

Note: Never operate a pressure washer with an inadequate water supply. Restricted inlet water flow can cause cavitation and damage the high-pressure pump.

Frequently Asked Questions

What is Karcher part number 4.730-168.3?

Karcher 4.730-168.3 is a complete water filter assembly used to filter incoming water on compatible professional high-pressure cleaning equipment.

Does Karcher 4.730-168.3 replace 4.730-168.0?

Yes. Part number 4.730-168.3 is identified as the replacement for the earlier Karcher 4.730-168.0 water filter assembly.

Will this water filter fit my Karcher HD 9/20-4?

The HD 9/20-4 is a referenced equipment model for this part. Because multiple machine versions exist, confirm the original filter part number against your equipment's parts diagram before ordering.

Why is a water inlet filter important on a pressure washer?

High-pressure washer pumps contain precision components that can be damaged by dirt, sand, rust, and other abrasive contaminants. An inlet filter helps remove these particles before they reach the pump.

Can a clogged water filter cause low pressure?

Yes. A clogged water inlet filter can restrict water flow to the pump, potentially resulting in reduced pressure, pulsation, cavitation, or other operating problems.

Is this the complete filter assembly or just a replacement screen?

Karcher identifies part number 4.730-168.3 as Water Filter Complete, rather than an individual replacement filter screen.

Order Karcher Replacement Parts from Steam-Brite

Steam-Brite supplies replacement parts, filters, pump components, fittings, and accessories for professional pressure washing and cleaning equipment.

When ordering Karcher replacement parts, verify the complete manufacturer part number to help ensure the correct component is selected for your equipment.

Order Part Number: Karcher 4.730-168.3

Product: Complete Water Filter Assembly for Compatible Karcher Professional High Pressure Washers.

Visit Steam-Brite for additional pressure washer replacement parts and accessories.

Manufacturer specifications, equipment compatibility, and product appearance are subject to change. Product images are for identification purposes. Orders are fulfilled according to the manufacturer part number purchased.