Begin your journey to appliance repair mastery…

Click here to check out our structured, online appliance repair training courses for rookies and experienced techs.

FAQs | Repair Videos | Academy | Newsletter | Podcast | Contact

Stay connected with us...

Samurai on Facebook - become a fan today! Sign up for our free newsletter and keep up with all things Appliantology. Subscribe to our YouTube channel for lots of appliance repair tips and help! Follow the Samurai on Twitter and get timely morsels of Appliantological Wisdom! Subscribe to our MST Radio podcast to learn secrets of the trade.
  • Announcements

    • Samurai Appliance Repair Man

      Webinar Recordings Index Page   11/07/2017

      On-demand appliance repair training videos for Professional Appliantologist members Over 30 hours (and growing!) of original, high quality appliance training webinars developed and given by yours truly are at your fingertips, on topics you won't find anywhere else. Fill in those knowledge gaps, strengthen those areas of uncertainty, and boost your skills. Watch on mobile or desktop at your convenience whenever, wherever.  Ultra Short Primer on Basic Electricity, Circuits, Ohm's Law, and Schematic Reading (Length: 1:04:48) Basic Refrigerator Troubleshooting (Length: 1:10:45) Schematic Reading Workshop, 10/2015 (Length 1:19:08) Troubleshooting Strategies for Computer-Controlled Appliances (Length: 48:34) Semiconductors and PN Junctions (Length: 1:04:37) Appliance Temperature Sensing Devices & Technology (Length: 1:27:33) Voltage Measurements, Meters, Ghost Voltages, and Triac-controlled Neutrals (Length: 1:29:32) Troubleshooting with Tech Sheets, Part 1, 4/2016 (Length: 1:09:26) Troubleshooting with Tech Sheets, Part 2, 4/2016 (Length: 1:21:11) Tech Sheet Review, 4/9/2016: Bosch Speed Cooker, Amana Refrigerator, GE Glass Cooktop Range (Length: 1:22:58) Pulse Width Modulated (PWM) Switches used in Samsung Switched Mode Power Supplies (SMPS) (Length: 27:07) PWM Computer Cooling Fan in a Whirlpool Refrigerator (Length: 14:53) Understanding AC Split-phase Household Power Supplies (Length: 52:41) Troubleshooting a Samsung Electric Dryer without Disassembly using Live Tests and the Schematic (Length: 22:47) Troubleshooting a Bosch Dishwasher No-Heat Problem using the Schematic and Live Tests (Length: 15:38) Linear Motors and Linear Compressors (Length: 55:54) Bi-directional PSC Drive Motor Systems in Whirlpool VM Washers (Length: 56:52) Appliance Service Call Structure and Troubleshooting Strategies (Length: 1:00:16) The Ten Step Troubleshooting Tango and Workshop Exercises (Length: 1:35:39) Troubleshooting Ten-Step Tango Advanced Workshop (Length: 1:32:06) Ten-Step Tango Troubleshooting Workshop: Refrigerators (Length: 1:35:57) Whirlpool Duet Washer Schematic Analysis & Whirlpool Dryer Moisture Sensor System (Length: 1:03:04) Neutral Vs. Ground, Inverter Microwave, Digital Communications, Loading Down in DC loads, and more! (Length: 1:14:45) Gas Oven Service Call After a Parts Changing Monkey (Length: 36:04) AFCI and GFCI Circuit Protection Technology (Length: 41:26) Troubleshooting Samsung Refrigerators and more (Length: 1:29:58) 3-way Valves and Dual Evaporator Refrigerators (Length: 1:15:45) Split-Phase Compressors and PTC Start Devices (Length: 1:11:57) Gas Dryer Ignition Systems (Length: 53:50) Refrigerator Sealed System Thermodynamics, Part 1 (Length: 43:07) Refrigerator Sealed System Thermodynamics, Part 2 (Length: 1:09:09) Refrigerator Sealed System Thermodynamics, Part 3 (Length: 1:11:56) Refrigerator Sealed System Thermodynamics, Part 4 (Length: 37:45) Refrigerator Sealed System Thermodynamics, Part 5 (Length: 16:35) To access these webinars and all the other info-goodies here at Appliantology, become a Professional Appliantologist today. If you need cost-effective, time-flexible, state-of-the-art appliance technical training, check out the Master Samurai Tech Academy.
    • Son of Samurai

      [Webinar] Appliantology Workshop   11/09/2017

      Information is the name of the game in the appliance repair trade today. Appliantology is a powerful information tool for the professional appliance repair technician. But just like with any of the more capable tools in your tool bag, many of the more powerful features are hidden from you unless you "read the manual." Ugh! Who wants to do that? Well, this is one time when you don't have to! In this webinar, Team Samurai will personally walk you through the site and show you many of the useful and powerful features that even long-time users probably never knew existed.   

Samurai Appliance Repair Man's Blog

  • entries
  • comments
  • views

How to replace the chopper-mascerator blade in an LG Dishwasher

Samurai Appliance Repair Man


Many dishwashers have a part called the macerator or chopper to cut up larger chunks of food before sending the waster stream back to the wash impeller. These are not meant to function as a disposal but to protect the wash impeller from stray chunks of food that may be circulating in the dishwasher. The best way to prepare dishes for the dishwasher is to scrape off all the chunks with a fork and leave the rest. Don't pre-rinse because you'll just create a caustic slurry that will etch your glassware. The chopper is there for the occasional soft chunk of food that made it into the dishwasher by mistake.

Sometimes, the chopper needs to be replaced. This is a fairly common and easy repair on the Whirlpool-built dishwashers. The procedure is similar on LG dishwashers.

Sometimes, you may need to replace the chopper in an LG dishwasher because it's making a weird whistling noise due to a defect in the design of the chopper blade. Brother john63 explains more about this and how to correct it:

<<<Any time the pump is running there is an annoying whistleing sound.>>>


During the WASH cycle---not the DRAIN MODE---correct?

All LDF6920 dishwashers have a flawed CHOPPER (also known as Macerator).

The CHOPPER has tips on it that are too much like an indian arrowhead tip---which causes noise during the Wash cycle.

A replacement CHOPPER corrects this.

Part Number---> 5832DD4001B

To replace the Chopper:

Remove both racks

Lift/remove the Lower Wash Arm (snaps out)

Remove the *Water Tower/Tube* that runs/routes from the Filter Housing---up the back of the dishwasher---and to the top of the dishwasher.

This done by removing the Phillips screw on the Filter Housing---which has a small stainless steel tab on it.

Then unsnap the mounting tabs (with your fingers or flat screwdriver) of the Water Tube at both---the top/center of the dishwasher and the back/center of the dishwasher.

Pull the Water Tower towards the front slightly---and twist/turn to the right---until it comes out of the Filter Housing.

Use a drill to remove all of the Filter Assy screws

Lift off the Filter Assy

At the rear of the Sump Assy---there will be a round/white Valve---pull it off (re-install the black o-ring if it has come off).

Remove the IMPELLER screw (reverse-thread) and pull.

Remove the Impeller Housing (lift off)

Remove the original CHOPPER and install the new one.

Re-assemble in reverse order (verify that the black gasket in correctly seated before carefully installing the Filter Housing).

Source: LG Dishwasher, Whistling, whirring sound

  • Like 1