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66-500 (Type-1) Delta Compressor - Overview

Diagrams for 66-500

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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.
REGULATOR REPAIR KIT – Part Number: N008792
$41.22
In Stock
REGULATOR REPAIR KIT
★★★★★
★★★★★
(1)
Part #N008792
This air compressor regulator repair kit restores proper pressure control and airflow by replacing worn internal components such as seals and the piston. Designed to address leaks or inconsistent pressure, it helps return the regulator to reliable working condition. Replacing damaged parts with this kit can improve performance and ensure consistent operation.
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.
BOLT .375-16X2.25 UN – Part Number: CAC-60
No Longer Available
BOLT .375-16X2.25 UN
Part #CAC-60
Used to secure the wheels on a compressor or generator, this Shoulder Bolt is roughly 3.75 inches long and is sourced directly from the original equipment manufacturer. It is made of dark grey metal, is not part of a kit or assembly, and is sold individually. This part needs to be replaced when it is damaged or worn and may cause the wheel to fall off if it breaks. You will need a wrench or socket to complete this repair. Customers rate this repair as Easy.
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.
REGULATOR 4PORT P1P2 – Part Number: D27256
No Longer Available
REGULATOR 4PORT P1P2
Part #D27256

Common Symptoms of the 66-500

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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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