Easy
15-30 minutes
This authentic OEM sourced replacement part that is designed for use with Karcher pressure washers. The purpose of this switch is to control on/off function of the unit. Because switches use mechanical internals, over time they will begin to deteriorate and fail eventually requiring replacement. This durable plastic switch is sold individually.
Switch 16a 3/4hf 9.085-034.0
OEM part for: Karcher
Part Number: 9.085-034.0
$8.07
In Stock
Order within the next 11 hours and your part ships today! 
Compatibility
This Switch 16a 3/4hf will fit the following 22 machines. Confirm this part works with your model, and view the detailed model diagrams and repair help we have to offer.
Karcher
Show More Compatible ModelsThis item works with the following types of products:
- Pressure Washer Parts
This part replaces obsolete part #: 9.036-381.0
Customer Part Reviews ?
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Great part
Worked great, my pressure washer is now in working condition
Guest -
August 20, 2021
Verified Purchase
exact match to original, works great.
Good part, delivered promptly.
Guest -
June 26, 2019
Verified Purchase
Part was the same as OEM part, fit and operation was perfect.
Pleased with the availability and shipping time.
Guest -
June 18, 2019
Verified Purchase
Questions & Answers ?
Our customer Service team is at the ready daily to answer your part and product questions.
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We have a dedicated staff with decades of collective experience in helping customers just like you purchase parts to repair their products.
Does this fit my product?Questions & Answers for Switch 16a 3/4hf
Can someone please tell me what is the rotary-switch replacement part for my Karcher K3.99 high pressure washer?
Jeffrey
for model number Karcher K3.99
asked on 2022-03-20
Hello Jeffrey, thank you for writing. Yes, the number 9.085-034.0 you had chosen is compatible with your model. If you need help placing an order, customer service is open 7 days a week. Please feel free to give us a call. We look forward to hearing from you.
eReplacementParts Team March 20, 2022
Customer Repair Instructions ?
All our customer repair instructions are solicited directly from other customers just like you who have purchased and replaced this exact part.
Power switch had failed and burned up melting switch and housing
BJ - May 30, 2018
👍 3 of 4 people found this instruction helpful
Tool Type
Pressure Washer
Difficulty
Medium
Time
30-60 minutes
Tools Used
Screwdriver, Pliers
Removed cover from pressure washer. Released tabs from switch cover housing. Determined switch was bad as one of the four connections had burnt off. Switch no longer functioned and had melted in the on position. This explained why device would not shut off before it finally failed. The burnt connection was no longer connected to the switch which also explained why the washer would not come back on after it cooled down. The melted switch is held in the lower housing which was also melted by the heat. The housing would no longer hold the switch in the correct position. After obtaining the new switch and lower housing, took a picture of the wiring and then proceeded to disconnect the starting capacitor then remaining wires on the switch. Disconnected ground wire by removing the hold down screw and pulled power cable through housing. Removed capacitor from lower housing. Removed 2 screws holding lower housing in place then lifted housing ensuring motor wires fed through housing. Reassembled with new parts in reverse order. Tested switch before putting cover back on power washer by ensuring pump assembly was in lower cover with hold down bracket securely fastened. Plugged in device and turned switch to on position. Pump started as expected. Turned switch off and device stopped. Unplugged unit and completed reassembly. Tested with water connected and ensured pump started/stopped when trigger was pulled/released.
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Electric pressure washer would not start
William - August 27, 2016
👍 2 of 3 people found this instruction helpful
Tool Type
Pressure Washer
Difficulty
Easy
Time
15-30 minutes
Tools Used
Screwdriver
Parts Used
Replaced switch recommended by ereplacementparts.com. simply removed cover and replaced switch.
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Power washer would not shut off using the primary rotary switch
Dave - November 21, 2022
Tool Type
Pressure Washer
Difficulty
Easy
Time
15-30 minutes
Tools Used
Screwdriver, Pliers, none
Parts Used
1 Separated halves of washer case (7 screws).
2 Removed snap on cover to the switch box.
3. Pulled switch with wires attached out of switch box.
4. Moved four wires from switch terminals from old switch to new switch.
5. Reinserted switch in switch box.
6. Reassembled 2 halves of washer case (7 screws)
2 Removed snap on cover to the switch box.
3. Pulled switch with wires attached out of switch box.
4. Moved four wires from switch terminals from old switch to new switch.
5. Reinserted switch in switch box.
6. Reassembled 2 halves of washer case (7 screws)
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motor would not start
dean - April 24, 2020
Tool Type
Pressure Washer
Difficulty
Easy
Time
30-60 minutes
Tools Used
Screwdriver
replaced all electrical components
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Switch not engaging
Dennis - July 26, 2018
Tool Type
Pressure Washer
Difficulty
Medium
Time
15-30 minutes
Tools Used
Screwdriver
Parts Used
1. Removed two screws to remove handle.
2. Removed six screws to open housing.
3. Opened switch box.
4. Removed four wires from switch.
5. Installed four wires on new switch.
6. Reassembled.
7. Saved $150.
2. Removed six screws to open housing.
3. Opened switch box.
4. Removed four wires from switch.
5. Installed four wires on new switch.
6. Reassembled.
7. Saved $150.
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Switch burned out
Ed - September 19, 2016
👍 1 of 2 people found this instruction helpful
Tool Type
Pressure Washer
Difficulty
Easy
Time
15-30 minutes
Tools Used
Screwdriver
Parts Used
Took pressure washer apart. Used multimeter to check continuity. Took switch apart and observed burned contact. Took photos of wiring first.
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Our customer service team are at the ready daily to answer your part and product questions. We have a dedicated staff with decades of collective experience in helping customers just like you purchase parts to repair their products.
All our part reviews are solicited directly from other customers who have purchased this exact part. While we moderate these reviews for profanity, offensive language or personally identifiable information, these reviews are posted exactly as submitted and no alterations are made by our team.
All our customer repair instructions are solicited directly from other customers just like you who have purchased and replaced this exact part. While we moderate these reviews for profanity, offensive language or personally identifiable information, these reviews are posted exactly as submitted and no alterations are made by our team.
Based on data from past customer purchasing behaviors, these parts are most commonly purchased together along with the part you are viewing. These parts may be necessary or helpful to replace to complete your current repair.
All our installation videos are created and produced in collaboration with our in-house repair technician, Mark Sodja, who has helped millions of eReplacementParts customers over the last 13 years repair their products. Mark has years of experience in selling and repairing both commercial and residential products with a specialty in gas-powered equipment.
This data is collected from customers who submitted a repair instruction after replacing this exact part. Customers can rate how easy the repair was to complete and how long it took. We aggregate this data to provide a repair rating that allows customers to quickly determine the difficulty and time needed to perform their own repair.
