Part Location Diagram of 5140240-52 DeWALT PISTON KIT
See part A-6 in the diagram
( Grid squares measure 1x1 inch )

PISTON KIT 5140240-52

Manufactured by:
DeWALT
ERP Number:
ERP18984551
Part Number:
5140240-52
Original Equipment Manufacturer ?
In Stock
Delivers in 3-5 Business Days!

A Bit Difficult 

30 - 60 mins 

(7 rated repairs) ?

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Product Description

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Piston Kit

Troubleshooting

This part works with the following brands:
  • Craftsman
  • Porter Cable
This part works with the following products:
  • Compressor
Part# 5140240-52 replaces these:
5140186-75, 5140240-52, E103495,

Customer Part Reviews

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4.6
Average Rating (out of 5):
★★★★★
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(10 Reviews)
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Questions & Answers

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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.

A Bit Difficult 

30 - 60 mins 

(7 rated repairs) ?
  • 1
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The piston ring had wore out and was leaking air.

Ed from DANVILLE, Illinois

2 of 2 people found this instruction helpful.
Difficulty Level:
Easy
Total Repair Time:
30 - 60 mins
Tools:
Screw drivers, Wrench set
Parts Used:
E104280, 5140240-52, E103623
Removed covers, fan, head, old piston from bearing then piston sleeve.
Placed piston and sleeve in lower head and onto piston. Tightened piston arm. Replaced lower gasket, placed upper head with new gasket and tightened bolts.
Placed new fan on shaft.
Removed and replaced hose.
Reinstalled covers.
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Easy to install and works great.

William from Jacksonville, Florida

2 of 2 people found this instruction helpful.
Difficulty Level:
Easy
Total Repair Time:
15 - 30 mins
Tools:
Screw drivers, Socket set
Parts Used:
5140240-52
Removed the plastic cover, then the head. One bolt to get the piston off the crankshaft, slid the old piston assembly out, slipped the new one in and reattached the head and cover. 20 minutes tops.
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worm components

Ronald from WINDER, Georgia

1 person found this instruction helpful.
Difficulty Level:
Easy
Total Repair Time:
Less than 15 mins
Tools:
Screw drivers, Socket set, Wrench (Adjustable), Wrench set
Parts Used:
5140240-52
un bolted the fan and head and replaced worn out parts
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Would not pump up pressure

John from Orange, Texas

0 of 1 people found this instruction helpful.
Difficulty Level:
A Bit Difficult
Total Repair Time:
30 - 60 mins
Tools:
Screw drivers, Socket set, Wrench set
Parts Used:
5140240-52, 5140186-73
Removed cowling, compressor head, cylinder, piston with compression ring.
Replaced with new parts in reverse order.
Only wish they had mentioned that the kit did not contain the rubber o rings.
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Air compressor wouldn\'t build to full pressure and would continue to run

Jeff from Wichita, Kansas

0 of 1 people found this instruction helpful.
Difficulty Level:
A Bit Difficult
Total Repair Time:
15 - 30 mins
Tools:
Screw drivers, Wrench (Adjustable)
Parts Used:
5140240-52
Removed the Shroud exposing all of the needed bolts to access the head and valves.
Removed the pressure line from the head to the tank, removed the 4 allen bolts holding the head and valve plate to the cylinder.
Set that all aside, and loosened the allen bolt and nut holding the connecting rod to the eccentric on the electric motor.
Slid the connecting rod off the bearing at an angle, then pushed the piston and rod up through the cylinder, taking the cylinder sleeve with it out.
Then reassembled the assembly with the new parts, in reverse order.
buttoned up the shroud and unit tested out just fine.
Make sure that when you put the valve plate back on under the head assembly to get the intake and the exhaust valve plate in the right direction, or there will be no way for the compressor to build the pressure it is designed for. You will hear a distinct noise if the valve plate is put on in the wrong direction.
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Weak air build up

Larry from HARTLEY, Texas

0 of 1 people found this instruction helpful.
Difficulty Level:
Difficult
Total Repair Time:
30 - 60 mins
Tools:
Socket set, Wrench (Adjustable), Wrench set
Parts Used:
5140240-52
Change out piston on oil less air compressor. Remove head and change sleeve and piston. Problem with removing fan on crank of shaft running piston. Be careful. this allen screw twisted off on me. Might have been left handed. Make sure and check. Used glue this time.
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Compressor would not pump over 50 psi

Thomas from LAKE PLACID, Florida

0 of 1 people found this instruction helpful.
Difficulty Level:
Easy
Total Repair Time:
30 - 60 mins
Tools:
Socket set, Wrench set
Parts Used:
5140240-52
Removed safety cover and air lines from compressor. Removed cylinder head and reed valve assy. Unbolted connecting rod from crankshaft and disconnected piston from connecting rod. Removed piston, connecting rod and cylinder from compressor housing. Reversed procedure to install new piston assy. kit. Compressor now pumps up to 150 psi. Tha nks, Tom E.
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  • 1

Model Cross Reference

This part works with the following models:
ERP Number: ERP18984551
Manufacturer Part Number: 5140240-52
Brand Model Number Description
Craftsman 921166420 Compressor - Air Compressor
Craftsman 921169130 Compressor - Air Compressor
Craftsman 921169140 Compressor - Air Compressor
Porter Cable PXCMF220VW Compressor - 1.5 Hp 20-Gallon Portable
Porter Cable PXCMF226VW Compressor - 1.5 HP Compressor