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CP503 (Type 3) Delta Compressor - Overview

Diagrams for CP503

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DRAIN VALVE – Part Number: N286039
$7.31
Special Order
DRAIN VALVE
★★★★★
★★★★★
(1)
Part #N286039
Frequently referred to as a Drain Plug, this Drain Valve is used to drain any condensation that has collected inside the tank to prevent the tank from rusting. It is not part of a kit or assembly, is sold individually, made of brass, is gold, and will be found at the bottom of the air tank. This part will need to be replaced when it is no longer able to provide a proper seal, or if it is visibly worn or damaged. You will need a wrench to complete this repair. Customers rate this repair as Easy.
AC CORD – Part Number: D26615
$48.88
In Stock
AC CORD
Part #D26615
This power cord is a genuine high quality item, it is not an aftermarket imitation. It is sourced directly from original equipment manufacturer for use with electric air compressors. It is connected to a standard US outlet to supply power to the unit. Please note, this rubber insulated power cord is sold individually. You will need a screwdriver to replace this item.
TUBE SEAL – Part Number: N044359
$6.40
In Stock
TUBE SEAL
Part #N044359
This replacement tube seal is a high quality item that is supplied by original equipment manufacturer for use with Craftsman air compressors. It is placed on the outlet tube coming from the head of the compressor. Please note this durable rubber tube seal is sold individually.
CLAMP HOSE .250 ID – Part Number: CAC-1206-1
$6.40
In Stock
CLAMP HOSE .250 ID
Part #CAC-1206-1
Genuine OEM replacement part, this item is sold individually. This part is used in various places in the compressors listed below. By its part name, it is used to clamp hoses onto certain parts on the compressors.
VALVE PLATE ASSY – Part Number: N017592SV
$22.71
In Stock
VALVE PLATE ASSY
Part #N017592SV
Genuine Porter Cable replacement part, this item is sold individually. Head Gasket Sold Separately. This part is used in the all of the compressors models listed below. When air is pumped by the piston it passes through the Valve Plate into the compressor tank. There are reeds on the valve plate that will eventually wear out, and the Valve plate will need to be replace. It is advisable at this time to replace the Graphite Gasket Kit, part number D30139.
BELT TIMING – Part Number: AC-0815
$32.37
In Stock
BELT TIMING
Part #AC-0815
This is an OEM part sourced directly from the manufacturer. The belt is commonly found in Craftsman air compressors. This part is made of flexible rubber, and is used to transfer power between the piston and the pump assembly. Over time, it may become cracked and brittle, requiring replacement. You may need an Allen wrench or hex key when replacing this part. This item is sold individually.
NUT PACK – Part Number: SSP-473
$6.40
In Stock
NUT PACK
Part #SSP-473
This is an OEM part sourced directly from the manufacturer. The nut sleeve is designed for use in Craftsman air compressors. This part is made of metal, and is generally used in securing the check valve. You may require a wrench when replacing this part. This item is sold individually.
Connecting Rod Assembly – Part Number: N036518
$55.07
In Stock
Connecting Rod Assembly
★★★★★
★★★★★
(1)
Part #N036518
This replacement piston kit is designed for use with select air compressors and includes everything you need to restore smooth, efficient operation. The kit comes with a piston rod, compression ring, cylinder sleeve, and bearing—all made from durable materials for long-lasting performance. These components work together to maintain proper compression and airflow inside the unit. Please note that this kit does not include the valve plate, head gaskets, or other compressor parts. To install, you’ll need a screwdriver, hex key (Allen wrench), and pliers. Replacing worn or damaged internal parts can help improve your compressor’s performance and extend its service life. This kit is sold individually and is ideal for routine maintenance or repair.
GASKET HEAD UMC GRAP – Part Number: Z-D24819
$29.56
In Stock
GASKET HEAD UMC GRAP
Part #Z-D24819
This is a genuine manufacturer-sourced replacement gasket, it is specially designed for use with Craftsman air compressors. It is utilized to provide an air-tight seal for the cylinder head, over time it may begin to wear out and crack eventually requiring a replacement to maintain peak performance. Please refer to the appropriate diagrams of your model for the correct location and use of this hardware. This high-quality component is made of durable composite material and it is sold individually.
HEAD UMC – Part Number: CAC-1196
$10.67
In Stock
HEAD UMC
Part #CAC-1196
This is an authentic item that is supplied directly from the original equipment manufacturer for use with air compressors. It is an identical replacement for damaged or missing cylinder head that was installed on a new unit, please make sure to refer to the appropriate diagrams of your model for the correct application of this component. This high-quality part is made of durable metal with plastic and is sold individually, keep in mind the gasket and the hardware are all sold separately.
SCREW #10-24X.875 – Part Number: SSF-995
$6.40
Special Order
SCREW #10-24X.875
Part #SSF-995
This is an authentic replacement part sourced directly from the manufacturer. The screw is commonly found in compressors from Porter Cable, Delta, DeVilbiss, Black & Decker, DeWALT, and Bostitch. This part is made of metal, and is generally used to secure the cylinder head to the pump and motor assembly. Please be aware that there are different screws used in the machine. Refer to the parts diagram to be sure of ordering the correct part. You will require a wrench when replacing this item. The screw is available as an individual replacement part.
ISOLATOR PUMP – Part Number: CAC-1254
$6.40
In Stock
ISOLATOR PUMP
Part #CAC-1254
This item has been sourced from the original manufacturer and is intended to be used with air compressors from Porter Cable, Delta, DeVilbiss, Black & Decker, and DeWalt. The rubber isolator fits between the pump and the tank. This item is used to absorb vibration caused by the pump to prevent damage to the tank or pump. This part is sold as an individual item.

Common Symptoms of the CP503

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Worn piston rod and sleeve
7 of 12 people found this instruction helpful.
  • Donald from BRYAN, TX
  • Really Easy
  • 30 - 60 mins
  • Nutdriver, Screw drivers
Disassemble plastic housing around compressor unit using appropriate tools. Remove the four bolts from the compressor head using a 5/16 nut driver. Carefully remove head assembly including airline. Remove bolt through rod bearing with Allen wrench.

Reassemble with new rod and piston assembly. Best to use blue locktite on bolt through rod bearing when reassembling. Make sure to torque all bolts to specs listed.
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The compressor was getting air
4 of 8 people found this instruction helpful.
  • Linda from CARO, MI
  • Really Easy
  • 30 - 60 mins
  • Screw drivers, Socket set, Wrench set
Put the seal in and it ran like a champ. No vacuum leak and it now runs again!
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Broken ground on original plug
2 of 2 people found this instruction helpful.
  • Debra from PRESCOTT VLY, AZ
  • Really Easy
  • 15 - 30 mins
  • Screw drivers
Removed cover & old cord.
Replaced with new cord & replaced cover.
Works perfect.
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