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Dewalt 5140121-19 Air Compressor Crankshaft

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Out of stock
SKU
5140121-19
Brand
DEWALT
DEWALT
Special Price $75.53 Regular Price $78.95
Quick Overview
The Dewalt 5140121-19 Air Compressor Crankshaft is a replacement part that will help restore the air compressor functionality. It serves as essential part that converts the motor rotational energy into reciprocating motion required to compress air. It is made for reliability, and durability that ensures it will run smoothly and perform to its optimum. It is ideal to use in different air compressor models to ensure consistent air pressure for the tools like nail guns, spray painters, and impact wrenches.

This Part Fits the Following Models (5)

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Customer Questions
Which DeWalt air compressor models are compatible with the 5140121-19 crankshaft?

This crankshaft is used in specific DeWalt reciprocating compressor pump assemblies, commonly found in models like DXCMLA3706056, DXCMWA5591056, and DXCMTB5590856. Exact compatibility depends on the pump type and revision.

What are the signs that the DeWalt Crankshaft is failing?

Common signs include knocking noises, loss of air pressure buildup, excessive vibration, overheating, or difficulty turning the pump manually due to internal wear or bearing damage.

Can I replace the Crankshaft myself?

But it is an advanced repair. It requires full pump disassembly, correct alignment of connecting rods, and proper bearing installation. Mechanical experience is strongly recommended.

What is the function of the 5140121-19 crankshaft in an air compressor?

The crankshaft converts rotary motion from the motor into reciprocating motion that drives the piston. This motion is essential for compressing air and building tank pressure efficiently.

This Dewalt 5140121-19 Air Compressor Crankshaft converts motor rotation into reciprocating piston movement, enabling the compressor pump to generate compressed air efficiently. The part is used in compatible DeWalt air compressor models, including DXCMWA5591056, DXCMLA3706056, and DXCMTB5590856.

Common Symptoms Associated with Dewalt 5140121-19 Air Compressor Crankshaft:

  • Excessive vibration during compressor operation.
  • Unusual knocking or metallic tapping noise from pump assembly.
  • Reduced air pressure buildup due to crankshaft imbalance.
  • Visible wear on crankshaft journals or connecting rod contact points.
  • Oil leakage near crankcase due to seal misalignment or shaft wear.

Knocking or Tapping Noise from Pump.

Quick Check: Listen for irregular contact between crankshaft and connecting rod assembly.

Fix Suggestion: Replace worn connecting rods or inspect crankshaft journals for scoring or deformation.

Prevention Tip: Maintain proper lubrication levels to reduce metal-on-metal wear.

Low Air Pressure Output.

Quick Check: Verify crankshaft rotation speed and check for slippage or binding.

Fix Suggestion: Replace damaged crankshaft bearings that may be restricting smooth rotation.

Prevention Tip: Perform routine lubrication checks and avoid overheating the compressor pump.

Oil Leakage from Crankcase Area.

Quick Check: Inspect crankshaft seals and housing for visible oil seepage.

Fix Suggestion: Replace worn crankshaft seals and ensure proper alignment during reassembly.

Prevention Tip: Avoid overfilling compressor oil and regularly inspect sealing components.

Crankshaft Wear or Scoring.

Quick Check: Remove pump cover and visually inspect shaft surface for grooves or uneven wear.

Fix Suggestion: Replace crankshaft if scoring is beyond tolerance limits.

Prevention Tip: Use recommended compressor oil and maintain scheduled servicing intervals.

Customer Experience: Many users report smoother compressor operation after replacing a worn crankshaft with this exact model, especially when addressing long-term vibration issues. Some technicians also note improved pressure consistency once alignment is corrected during installation.

Disclaimer: Troubleshooting guidance is for general reference only and may vary by condition; always verify the issue and follow the manufacturer's instruction manual, safety guidelines, and service procedures before repairs or part replacement.

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