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5140043-77 Retainer, Piston - DeWalt

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$33.98
In Stock
SKU
5140043-77
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Know Before You Order

Some orders ship faster than others

We stock tens of thousands of parts in our warehouse, and most in-stock orders ship within 24 business hours. Because we specialize in hard-to-find tool parts, some items are sourced directly from the manufacturer after your order is placed and may require 10–14 business days before shipment. We believe in being transparent about timelines so you know what to expect before ordering. If timing is critical, please contact with your part number for an estimated delivery timeframe.

Why does M&M Tool Parts offer parts other companies don’t?

As a family-owned business, we’ve built long-standing relationships with trusted manufacturers across the industry. These partnerships allow us to source specialty parts that are often unavailable through larger retailers or online marketplaces. In many cases, M&M Tool Parts provides one of the few reliable ways to obtain these components — and we work hard to get them to you as quickly as possible.

What should I expect after placing my order?

Our team begins processing orders immediately. If your item is stocked locally, you’ll typically receive tracking information within 24 business hours. For manufacturer-sourced items, we coordinate directly with vendors to secure and ship your order as efficiently as possible. We understand downtime is frustrating, and we sincerely appreciate your patience while we help source parts that can often be difficult to find elsewhere.

This DeWalt 5140043-77 Pump Piston Retainer is a genuine OEM replacement component used in compatible pressure washer assemblies.
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The DeWalt 5140043-77 Pump Piston Retainer is a genuine OEM replacement component used in compatible pressure washer assemblies. Manufacturer service information identifies this item asRETAINER, PISTON.

Product Specifications

Part Number: 5140043-77
Part Type: Pump Piston Retainer
Manufacturer: DeWalt
Manufacturer Description: RETAINER, PISTON
Application: Pressure Washer Pump Control Assembly
Figure Number in DeWalt DH3028 Type 0: 331
Quantity Used in DeWalt DH3028 Type 0: 1
Condition: Genuine OEM DeWalt Replacement Part

Tool Compatibility

DeWalt 5140043-77 is documented for compatible configurations of the following pressure washers:

DeWalt DH3028 Type 0
DeWalt DP3100 Type 2
DeWalt DPD3300 Type 1

This list highlights verified applications and may not include every compatible regional or cross-branded model. Verify the complete model and type number against the applicable manufacturer parts diagram before ordering.

Part Function

This pump piston retainer holds the control piston in its designated position and maintains alignment within the pump assembly.

When to Replace

Replace this component if it is cracked, worn, loose, deformed, or no longer retains the piston securely. Inspect the complete assembly before ordering because the same symptom can be caused by nearby seals, valves, fittings, hardware, or other pump components.

Important Compatibility Information

Part 5140043-77 is documented for specific pressure washer and pump configurations. Do not select this component based only on equipment type, PSI rating, physical appearance, or approximate dimensions. Similar machines may use different pumps, engines, fittings, or production revisions.

Confirm the exact equipment model, type number, and applicable parts breakdown before ordering. Components that appear similar should not be assumed interchangeable unless the manufacturer documents a replacement or supersession.

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You're reviewing:5140043-77 Retainer, Piston - DeWalt
Compatibility
  1. DeWalt DH3028 Type 0 Parts - Pressure Washer
  2. DeWalt DP3100 Type 2 Parts - Pressure Washer
  3. DeWalt DPD3300 Type 1 Parts - Pressure Washer
  4. DeWALT Parts
  5. DeWALT Pressure Washer Parts
  6. DeWalt DPD3000IC Type 1 Parts - Pressure Washer
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