Simple Steps to Replace a Commercial Dishwasher Spray Arm

Simple Steps to Replace a Commercial Dishwasher Spray Arm

Commercial dishwashers are the unsung heroes of busy kitchens, working tirelessly to clean hundreds of dishes every day. One of the most critical components of these machines is the spray arm. This rotating part distributes high-pressure water throughout the unit, ensuring dishes come out spotless. However, over time, spray arms can become clogged, worn out, or damaged—compromising the cleaning performance. Fortunately, a dishwasher spray arm replacement is a straightforward process that most maintenance staff or kitchen managers can perform themselves.

In this comprehensive guide, we’ll walk you through the simple steps to replace a commercial dishwasher spray arm, and help you maintain this essential component to prolong the life and performance of your machine.

Steps for Commercial Dishwasher Spray Arm Replacement

Replacing the spray arm in a commercial dishwasher may seem like a daunting task, especially in high-demand kitchen environments. However, with the right tools, a basic understanding of the machine’s internal structure, and a methodical approach, you can perform a dishwasher spray arm replacement safely and effectively.

We clearly outline each step in this tutorial, professional format, helping you restore your dishwasher’s full performance without unnecessary downtime.

Step 1: Power Down and Disconnect the Dishwasher

Safety must always come first when handling commercial kitchen equipment. Turn off the dishwasher first 

• If your model is hardwired, ensure the circuit breaker is switched off. 

• For plug-in units, unplug the power cord from the wall outlet. 

• Some facilities may also follow lockout/tagout procedures as part of workplace safety protocols—these should be strictly followed to prevent accidental startup during maintenance.

Turn off the dishwasher's water supply if required to prevent unexpected leaks or surges during the replacement process.

Step 2: Remove Dish Racks and Trays

Once the unit is powered down and safe to access, open the door and remove the internal dish racks, cutlery trays, or baskets. 

• You will have complete, unhindered access to the spray arm as a result, usually located at the base of the washer and sometimes below the upper rack as well.

• Handle these parts with care and place them in a clean, dry area to avoid contamination or damage.
  

Step 3: Identify the Spray Arm Configuration

Commercial dishwashers can have one or more spray arms, depending on the size and model. The most common configuration includes:

• Lower spray arm is positioned at the base of the machine.

• Upper spray arm is located beneath the top rack or mounted overhead.

• Additional arms or side jets; in some advanced models for specialized washing.

Identify which spray arm requires replacement.Because it is constantly exposed to food particles and high-pressure water flow, the bottom spray arm often sustains the most wear.

Take a close look at how the spray arm is attached. Common mounting mechanisms include:

• A central screw or bolt.

• Snap-on clips or brackets.

• Twist-lock fittings.

To confirm the proper removal technique, consult the user handbook or technical documents that came with your dishwasher.

Step 4: Remove the Spray Arm

Unscrew the spray arm or detach it from its mount, then remove it forcefully but gently. Use the appropriate screwdriver, wrench, or hand pressure as needed. Do not use excessive force, as this could damage nearby components or the mounting mechanism. If the arm is stuck due to mineral buildup or corrosion, apply a food-safe descaling solution around the base and allow it to sit for a few minutes before attempting removal again. After removing it, carefully examine the spray arm. Look for

• Cracks, breaks, or melted plastic.

• Warped metal or rubber seals.

• Clogs in the spray holes caused by debris or limescale.

This inspection confirms whether the dishwasher spray arm replacement is necessary and also informs your ongoing maintenance strategy.

Step 5: Clean the Mounting Area

Use this time to clean the exposed area after removing the previous spray arm. 

• Use a soft cloth and mild detergent to remove any accumulated grease, food debris, or water deposits. 

• You may also use a descaler if your dishwasher operates in a hard-water region.

• Clean mounting points and water ports thoroughly, as obstructions in these areas can affect the new spray arm’s performance.

This step is essential in preventing immediate recontamination of the new part.

Step 6: Match and Prepare the Replacement Spray Arm

Before installing the new component, ensure that your replacement part is compatible with your specific dishwasher model. Using an incorrect part may lead to poor performance, increased wear, or damage to other internal components. Here’s what to check

• Model number compatibility.

• Matching mounting mechanism.

• Correct length and diameter.

• Proper spray hole alignment.

OEM (Original Equipment Manufacturer) parts are generally preferred for dishwasher spray arm replacement due to guaranteed fit and long-term reliability. Prior to installation, check the new part for manufacturing flaws or transportation damage.

Step 7: Install the New Spray Arm

Position the replacement spray arm over the mounting port and align it properly. Carefully attach it using the appropriate method—screwing it in, snapping it into place, or twisting it to lock.

• Once secured, gently rotate the spray arm manually to ensure it spins freely.

• There should be no resistance, wobble, or obstruction from surrounding components.

• Smooth rotation is critical for ensuring proper water distribution during wash cycles.

If the arm doesn’t rotate smoothly, recheck the alignment and verify that no debris is lodged in the pivot point.

Step 8: Reinsert Racks and Close the Unit

With the spray arm securely installed, reinsert the dish racks and trays into the dishwasher. 

• Slide them along the guide rails and ensure they’re seated properly. 

• Verify that the racks don't obstruct the spray arm's movement.

Check that all internal components are correctly aligned and that there are no foreign objects or loose screws inside the dishwasher.

Step 9: Restore Power and Run a Test Cycle

Once everything is reassembled, restore power to the unit by switching on the breaker or plugging it back in. If the water supply was turned off, reopen the valve slowly to avoid pressure surges. Run a short wash cycle with the dishwasher empty. This test cycle serves several purposes:

• Confirms the correct rotation of the spray arm.

• Verifies that there are no leaks or strange sounds.

• Ensures water pressure and temperature are functioning as expected.

After the cycle is over, open the dishwasher to examine the spray arm and its surrounding parts. Everything should appear clean, dry (except internal walls), and properly seated.

Step 10: Document the Replacement and Monitor Performance

Once the dishwasher spray arm replacement is complete and verified, it’s best practice to document the maintenance activity. Note the date of replacement, part number, and technician involved. This is especially important in commercial kitchens where maintenance logs are required for regulatory compliance. Over the coming days, keep an eye on the new spray arm's performance. Key indicators of a successful replacement include:

• Consistently clean dishes.

• Quiet, smooth operation.

• No water pooling or leaks.

• Efficient wash cycle times.

Performing a dishwasher spray arm replacement in a commercial kitchen setting is a task well within reach for most facility managers or maintenance personnel. With proper preparation, attention to detail, and adherence to safety procedures, this simple fix can restore peak performance to your dishwasher, save on service costs, and extend the life of your equipment. Always use high-quality replacement parts, document your maintenance efforts, and implement a regular cleaning schedule to prevent future issues. The spray arm may be a small part of your operation, but its role is vital to the cleanliness, efficiency, and reputation of commercial kitchen.

Written by Allen Rode for PartsFe, your trusted source for a variety of high-quality commercial dishwasher parts, including dishwasher spray arms and dishwasher drain hoses.