Kärcher K 502 User Manual

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Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-3

Assembly Instructions . . . . . . . . . . . . . . . . . . . . . . . . .3

Operating Instructions . . . . . . . . . . . . . . . . . . . . . . . . .4

GFCI Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

Using the Accessories . . . . . . . . . . . . . . . . . . . . . . . . .5

Working with Detergents . . . . . . . . . . . . . . . . . . . . . . .6

Shut Down and Clean-Up . . . . . . . . . . . . . . . . . . . . . .7

Taking a Break . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

Winterizing and Long-Term Storage . . . . . . . . . . . . . .7

Cleaning Tips . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-9

Optional Cleaning Accessories . . . . . . . . . . . . . . . . . .9

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . .10-11

Model K 502 M Part No. 1.069-935.0

High Pressure Washer Operator Manual

Specifications

Operating pressure 1500 PSI

Water volume 1.7 GPM

Voltage 120 V

Amp draw 13 AMPS

In USA Call:

1-800-537-4129

or visit our website:

www.karcher-usa.com

Table of Contents

Questions and Answers:

K
Katrina AdamsAug 12, 2025
Why does the output pressure of my Kärcher Pressure Washer vary?
- P
  Phillip MartinezAug 12, 2025
  If the output pressure of your Kärcher Pressure Washer is fluctuating, it could be due to several reasons: * There might not be enough inlet water supply. Turn the water on full force and check the garden hose for kinks, leaks, or blockages. * The pump could be sucking air. Check that hoses and fittings are airtight. Turn off the machine and purge the pump by squeezing the trigger gun until a steady flow of water emerges through the nozzle. * The water inlet filter may be clogged. Remove the filter and rinse it out in warm water. * The discharge nozzle might be obstructed. Blow out or remove debris with a fine needle. * The gun, hose, or spray wand could be calcified. Run distilled vinegar through the detergent suction tube.
M
Mr. Johnny BarkerAug 16, 2025
Why won't my Kärcher K 502 motor start?
- T
  Tyler ConnerAug 16, 2025
  There are several reasons why your Kärcher Pressure Washer motor might not start: * The On/Off switch may be in the “OFF” (O) position. If this is the case, turn the switch to the “ON” (I) position. * The power cord may not be plugged in. Ensure the power cord is properly plugged in. * The extension cord may be too long, not the proper gauge, or damaged. Replace the extension cord with either a 25 ft. 12/3 gauge cord or a 50 ft. 10/3 gauge cord. * The electrical outlet may not supply adequate power. Try a different outlet. * The Ground Fault Circuit Interrupter (GFCI) may have tripped. Reset the breaker (power supply) or GFCI.
D
David ReidAug 25, 2025
Why is my Kärcher K 502 pump noisy?
- M
  matthew45Aug 25, 2025
  If your Kärcher Pressure Washer pump is making excessive noise, it might be sucking in air. To resolve this, check that all hoses and fittings are airtight. Turn off the machine and purge the pump by squeezing the trigger gun until a steady flow of water emerges through the nozzle.
T
Tommy WilkersonAug 27, 2025
What to do if Kärcher K 502 Pressure Washer doesn't reach high pressure?
- K
  Kevin MitchellAug 27, 2025
  If your Kärcher Pressure Washer is not reaching high pressure, check these possible causes: * The diameter of the garden hose may be too small. Replace it with a 3/4 inch garden hose. * The water supply may be restricted. Inspect the garden hose for kinks, leaks, and blockages. * There might not be enough inlet water supply. Open the water source fully. * The water inlet filter could be clogged. Remove the filter and rinse it out in warm water. * The spray wand may be in the low-pressure position. Turn the spray wand to the high-pressure position. * A wash brush might be attached. Attach the vario spray wand.
C
Christopher FernandezAug 31, 2025
How to fix a leaking garden hose connection on Kärcher Pressure Washer?
- Q
  qgarciaAug 31, 2025
  If your garden hose connection is leaking on your Kärcher Pressure Washer, it could be due to loose fittings. Make sure to tighten the fittings. Alternatively, there might be a missing or worn rubber washer. Insert a new washer to resolve this issue.
H
Holly MeadowsSep 4, 2025
What causes a Kärcher K 502 spray wand to leak?
- J
  James JohnsonSep 4, 2025
  If your Kärcher Pressure Washer's spray wand or spray wand extension is leaking, consider these possibilities: * The spray wand may not be properly attached. Insert the spray wand of your choice into the wand extension, push it in, and turn it clockwise to lock it in place. * The spray wand extension might not be properly attached. Insert the spray wand extension into the trigger gun, press it in against the spring tension, and twist it into the lock position. Turn the spray wand extension collar clockwise until tight. * A broken o-ring.
E
Elizabeth DonaldsonSep 8, 2025
Why is my Kärcher Pressure Washer leaking water from the pump?
- S
  Stephanie JensenSep 8, 2025
  If your Kärcher Pressure Washer is leaking water from the pump, it could be due to loose fittings. Check that all fittings are tight.

Kärcher K 502 Specifications

General

Brand	Kärcher
Model	K 502
Category	Pressure Washer
Language	English

Summary

Overview of Karcher Model K 502 M

Critical Safety Warnings (NEVER!)

Crucial safety warnings regarding safe operation and prohibited actions with the pressure washer.

Important Safety Precautions

General Safety Warnings

Basic precautions to follow when using the product to prevent injury and damage.

GFCI Protection Explained

Details on the built-in Ground Fault Circuit Interrupter (GFCI) and its function.

Water Supply Requirements

Specifies requirements for water supply, including temperature and flow rate.

Assembly Instructions

Attaching Transport Handle

Connecting High Pressure Hose

Attaching Spray Wand Extension

Operating Instructions

Connect High Pressure Hose to Unit

Procedure for connecting the high-pressure hose to the unit's outlet.

Install Vario Spray Wand

Connect Garden Hose to Water Inlet

Steps to connect the garden hose to the unit's water inlet.

Connect to Cold Water Source

Connecting the garden hose to the cold water supply and turning water on.

Prime Unit and Remove Air

Priming the unit by triggering the gun to expel trapped air.

Start the Pressure Washer

Turning the pressure washer switch to the 'ON' position.

GFCI Instructions

Testing GFCI Connection

Using the Accessories

Working with Detergents

Shutting Down and Clean-Up

Rinsing the Unit

Powering Off and Disconnecting

Winterizing and Long-Term Storage

Preparing for Storage

Troubleshooting Common Issues

Motor Will Not Start

Diagnosing and resolving issues when the pressure washer motor does not start.

Low Pressure Output

Troubleshooting steps for when the unit does not reach high pressure.

Inconsistent Pressure Output

Solutions for problems where output pressure varies high and low.

No Detergent Dispensing

Garden Hose Connection Leaks

Spray Wand or Extension Leaks

Noisy Pump Issues

Water Leaks from Pump

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