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Chelsea PTO 420 Series Parts Manual

This Chelsea Illustrated Parts List covering the 420 PTO helps you identify the correct gear sets, shifter kits and service parts for your power take-off before you order.

Models covered420
PTO typeChelsea 400 Series
DocumentIllustrated Parts List (Chelsea)
Length11 pages
FormatPDF — view below or download free

What’s inside

  • Gear sets & output shaft assemblies
  • Shifter & air-shift control kits
  • Mounting gaskets & adapter plates
  • Housings & cover assemblies
  • Seal, bearing & snap-ring kits
  • Application & ratio reference tables
  • Exploded views with OEM part numbers

Read the manual

Download PDF

This is our interactive copy of the factory manual — part numbers are clickable and every exploded-view callout links to the part. Plain factory PDF if you prefer it.

Chelsea parts & units we stock

Pro Gear and Transmission stocks new, remanufactured and good-used parts for Chelsea PTO units:

Chelsea 420 parts list — every part number linked

This is the bill of materials from the manual above, matched against our own stock. Click any part number to see the listing and current price, or use ▶ Add to drop it straight in your cart. 50 of the 94 lines in this book are parts we carry.

Prices are shown on each product page so you always see the current one. Anything not linked, or marked no longer available, we can still usually source — call (877) 776-4600.

Prefer the book? Download the interactive PDF — same manual, with every part number and every exploded-view balloon clickable.

Parts list (page 3) — manual page 3

ItemPart numberDescriptionQtyOrder
33 38
 1-P-196HOUSING-Deep Mount  call to confirm availability1
3550439BEARING CONE, Input2▶ Add
 328017XGEAR SPACER KIT, Input (contains Item 4)  no longer available — call for a replacement1
59-P-60IDLER SHAFT1▶ Add
 378452-4SET SCREW-For Deep Mount (¼" 20 x 5/16")1▶ Add
72-P-559SLIDING GEAR, Output (24 Teeth)1▶ Add
8378391LOCK RING2▶ Add
93-P-202DRIVE SHAFT, Output (11/," Round)1▶ Add

Parts list (page 4) — manual page 4

ItemPart numberDescriptionQtyOrder
12550221. . . . . ▶ Add
1321-P-131. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ▶ Add
 328273X. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1▶ Add
15550221. . . . . . . . . ▶ Add
1621-P-130. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ▶ Add
1728-P-52. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  call to confirm availability 
18378430-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1▶ Add
 328815-1XWIRE SHIFT COVER ASSEMBLY,  call to confirm availability 
 328815-2X. . . . . . . . . . . . . . . . . . . . . . . . . . .  call to confirm availability 
1934-P-74. . . . . . . . . . . . . . . . . . . . . . . . . ▶ Add
SHIFTER COVER
2037-P-19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ▶ Add
SHIFTER SPRING
2163-P-16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ▶ Add
POPPET 1
2228-P-49. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  no longer available — call for a replacement 
 328813-2X. . . . . . . . . . . . . . . . . . .  call to confirm availability 
24378004. . . . . . . . . . . . . . . . . . . ▶ Add
2551-P-22. . . . . . . . . . . . . . . . . . . . . . . . . . ▶ Add
SHIFTER LEVER
26378003. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  call to confirm availability 
28378969- . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  no longer available — call for a replacement 
FIBER SPACER
3035-P-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ▶ Add
31378430-10. . . . . . . . . . . . . . . . . . . . . . . . . . ▶ Add
WOODRUFF KEY 1
3350-P-17. . . . . . . ▶ Add
BRACKET
3450-P-19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ▶ Add
SWIVEL BRACKET 1
35500396-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ▶ Add
36378326- . . . . . . . . . . . . . . . . . . . ▶ Add
 378019PIVOT PIN ▶ Add
 500568-4SET SCREW (¼" 20 x ½")1▶ Add

Parts list (page 5) — manual page 5

ItemPart numberDescriptionQtyOrder
 328831-1XLEVER CONTROL COVER ASSEMBLY,  call to confirm availability 
 328831-2XLEVER CONTROL COVER ASSEMBLY,  call to confirm availability 
4034-P-87SHIFTER COVER  call to confirm availability1
4128-P-4OIL SEAL  call to confirm availability2
4232-P-144SHIFTER FORK1▶ Add
4311-P-112SHIFTER SHAFT1▶ Add
44378447-4SCREW, hex socket (S/,6" 18 x W')1▶ Add
45378002SHIFTER BALL1▶ Add
4637-P-14SHIFTER SPRING1▶ Add
47378554SPRING CAP1▶ Add
48500381-3JAM NUT, hex head1▶ Add
50378969INDICATOR SWITCH  no longer available — call for a replacement1

Parts list (page 6) — manual page 6

ItemPart numberDescriptionQtyOrder
 328832-1XAIR SHIFT COVER ASSEMBLY,  call to confirm availability 
 328832-2XAIR SHIFT COVER ASSEMBLY,  call to confirm availability 
5234-P-76SHIFTER COVER  call to confirm availability1
5432-P-144SHIFTER FORK1▶ Add
5511-P-122SHIFTER SHAFT  call to confirm availability1
56378447-4SCREW, hex socket (S/16" 18 x ¾")3▶ Add
58378462SPRING RETAINER WASHER1▶ Add
6166-P-4PISTON  no longer available — call for a replacement1
6235-P-14CYLINDER CAP GASKET1▶ Add
6365-P-14CYLINDER CAP1▶ Add
64500118-3PIPE PLUG (1/8" 27 N.P.T.)  call to confirm availability1
65378969INDICATOR SWITCH  no longer available — call for a replacement1
66378430-8SCREW, hex head (Eslock S/ 16" 18 x ¾")4▶ Add

Parts list (page 7) — manual page 7

ItemPart numberDescriptionQtyOrder
 328648XHOLLEY GOVERNOR DRIVE CONVERSION KIT  call to confirm availability 
 328060XDRIVE SHAFT & SPINNER ASSEMBLY (contains items 67-68)  call to confirm availability1
673-P-270DRIVE SHAFT. Standard  call to confirm availability1
68378178SPINNER  call to confirm availability1
6928-P-53OIL SEAL  call to confirm availability1
70378391LOCK RING1▶ Add
 328588XBEARING CAP ASSEMBLY (contains Items 72-73)  call to confirm availability1
72550221BEARING CUP1▶ Add
7321-P-272BEARING CAP N.S.S  call to confirm availability 

Parts list (page 8) — manual page 8

ItemPart numberDescriptionQtyOrder
 328160XPUMP SHAFT & SPINNER ASSEMBLY (contains Items 74-75),  call to confirm availability 
 328097XPUMP SHAFT & SPINNER ASSEMBLY (contains Items 74-75),  call to confirm availability 
 328096XPUMP SHAFT & SPINNER ASSEMBLY (contains Items 74-75),  call to confirm availability 
 328743XPUMP SHAFT & SPINNER ASS EMBLY (contains Items 74-75),  call to confirm availability 
 3-P-348PUMP SHAFT (For Pump Suffix G)  call to confirm availability 
 3-P-311PUMP SHAFT (For Pump Suffix J.M)  call to confirm availability 
 3-P-310PUMP SHAFT (For Pump Suffix K, N, P, Q)  call to confirm availability 
75378178SPINNER  call to confirm availability 
7628-P-53OIL SEAL  call to confirm availability 
 328588XHOLLEY GOVERNOR DRIVE BEARING CAP ASS EMBLY,  call to confirm availability 
77550221BEARING CUP1▶ Add
7821-P-272BEARING CAP N.S.S  call to confirm availability 
79378391LOCK RING ▶ Add
NAME PLATE
 37897812-VOLT ▶ Add
INDICATOR LIGHT
 378969White Nylon  no longer available — call for a replacement 

Kits — manual page 9

ItemPart numberDescriptionQtyOrder
 328580X378447-8 (5,6 " 18x 1½") 328591-10X ▶ Add
 328580X378447-8 (5 15" 18 X 1½") 328591-1 1X ▶ Add
 328580X378447-8 (5 " 18 X 1½") 328591-18X ▶ Add
16 -
 328583X378447-7 (;·5" 18 X 1¼") 328591-20X  call to confirm availability 
 328584X378447•8 (5 15" 18 X 1½") 328591-21X  call to confirm availability 
 328328X378447-7 (5/15" 18 X 1¼") 328591-23X ▶ Add
 328589XI 378447-8 (5/,s" 18 1½") 328591-1 7X ▶ Add
 328710X378918 Stud (4 Required) 328591-25X  call to confirm availability 
 21-P-166Pump Flange interferes with  call to confirm availability 
421-P-269Pump Flange interferes with ▶ Add
 328711XPump to P.T.O. Mounting ▶ Add

Part numbers and descriptions are taken from the Chelsea/Parker parts manual on this page. Chelsea® and Parker® are trademarks of Parker Hannifin Corporation; Pro Gear and Transmission is an independent distributor.

Not sure exactly which unit you have? Check our identification guides, or Ask an Expert — send us photos of your data tag and our drivetrain specialists will identify the unit and the exact parts you need. Or call (877) 776-4600.
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