Chelsea PTO 721 Series Parts Manual
Power Take-Off Bill of Materials 721 Series
Click a number on the diagram to highlight that part below.
| Item | Part No. | Description | Qty | Notes | Price | |
|---|---|---|---|---|---|---|
| 1 | 1P337 | Housing Gearbox | 1 | — | Call for availability | |
| 2 | 2P721 | Gear, Sliding 19-T | 2 | $274.46 | Add to Cart | |
| 3 | 3P859 | Drive Shaft, Standard Output (1 .250" Dia.) | 2 | $265.44 | Add to Cart | |
| 4 | 3P205 | Drive Shaft, Standard Input (1 .250" Dia.) | 1 | — | Call for availability | |
| 6 | 4P46 | Spacer | 1 | $92.00 | Add to Cart | |
| 7 | 4P47 | Spacer | 1 | $66.23 | Add to Cart | |
| 9 | 5P220 | Gear, Idler | 1 | — | No longer available — call for replacement | |
| 10 | 9P56 | Shaft, Idler | 1 | — | Call for availability | |
| 14P15 | Spacer | A.R. | $5.70 | Add to Cart | ||
| 12 | 21P67 | Bearing Cap, Open | 2 | $101.13 | Add to Cart | |
| 14 | 22P231 | Gasket, Bearing Cap | A.R. | $2.01 | Add to Cart | |
| 22P232 | Gasket, Bearing Cap | A.R. | $2.14 | Add to Cart | ||
| 18 | 22P241 | Gasket, Bearing Cap (.010" Thick) | A.R. | $2.30 | Add to Cart | |
| 22P242 | Gasket, Bearing Cap (.020" Thick) | A.R. | $10.49 | Add to Cart | ||
| 22P243 | Gasket, Bearing Cap (.015" Thick) | A.R. | $10.49 | Add to Cart | ||
| 21 | 27P9 | Retaining Plate | 1 | $3.19 | Add to Cart | |
| 22 | 28P191 | O-ring | 1 | $3.59 | Add to Cart | |
| 23 | 28P216 | Oil Seal | 4 | $21.40 | Add to Cart | |
| 25 | 33P64 | Gear, Drive | 1 | $254.31 | Add to Cart | |
| 26 | 34P16 | Cover Plate | 1 | $32.41 | Superseded by 34P314Add to Cart | |
| 27 | 35P8 | Gasket, Shifter Cover (.020" Thick) | 2 | $3.48 | Add to Cart | |
| 28 | 35P59 | Gasket, Cover Plate | 2 | $12.57 | Add to Cart | |
| 29 | 68P2 | Name Plate | 1 | $2.65 | Add to Cart | |
| 328273X | Bearing Cap Sub-assembly, Open (includes Items 32-32) | 2 | $64.09 | Add to Cart | ||
| 32 | 21P418 | Bearing Cap (open) | 1 | — | Call for availability | |
| 33 | 550221 | Bearing Cup | 1 | $14.19 | Add to Cart | |
| 328274X | Bearing Cap Sub-assembly, Closed (includes Items 36-37) | 2 | $64.09 | Add to Cart | ||
| 36 | 21P420 | Bearing Cap (closed) | 1 | — | Call for availability | |
| 37 | 550221 | Bearing Cup | 1 | $14.19 | Add to Cart | |
| 85 | 378391 | Lockring | 4 | $2.47 | Add to Cart | |
| 86 | 378422 | Drive Screw | 2 | $11.52 | Add to Cart | |
| 88 | 3784308 | Capscrew, Hex Head (.375"-16 X .500") | 1 | $2.06 | Add to Cart | |
| 89 | 3784309 | Capscrew, Hex Head (.375"-16 X .875") | 14 | $1.76 | Add to Cart | |
| 90 | 37843010 | Capscrew, Hex Head (.375"-16 X 1 .000") | 16 | $1.76 | Add to Cart | |
| 92 | 3784314 | Capscrew, Hex Head (.375"-16 X .500") | 6 | $2.14 | Add to Cart | |
| 93 | 379064 | Pipe Plug (.500"-14) | 2 | $26.63 | Add to Cart | |
| 95 | 379334 | Oil Level Caution Tag (shipped Wired To Unit) | 1 | $7.03 | Add to Cart | |
| 96 | 50000724 | Woodruff Key (ref. Input Shaft) | 1 | $1.83 | Add to Cart | |
| 97 | 50000729 | Woodruff Key (.312" X 1 .125") | 4 | $3.11 | Add to Cart | |
| 99 | 50016610 | Welch Plug (.750" Dia.) | 1 | $1.66 | Add to Cart | |
| 100 | 5001671 | Breather Cap | 1 | — | No longer available — call for replacement | |
| 101 | 5009251 | Pipe, Street Elbow | 1 | — | No longer available — call for replacement | |
| 103 | 550218 | Bearing Cup | 2 | $8.93 | Add to Cart | |
| 104 | 550397 | Bearing Cone | 2 | $36.75 | Add to Cart | |
| 105 | 550437 | Bearing Cone | 2 | $20.49 | Add to Cart | |
| 106 | 550439 | Bearing Cone | 2 | $51.63 | Add to Cart | |
| 107 | 550532 | Bearing Cone | 2 | $36.75 | Add to Cart |
Power Take-Off Air Control 721 Series
| Item | Part No. | Description | Qty | Notes | Price | |
|---|---|---|---|---|---|---|
| 3288261X3X | Air Shift Cover Assembly (includes Items42-66) | 1 or | — | Call for availability | ||
| 40 | 3288262X4X | Air Shift Cover Assembly (includes Items42-66) | 1 | — | Call for availability | |
| 42 | 11P129 | Shifter Shaft | 1 | $200.74 | Add to Cart | |
| 43 | 65P23 | Cover, Shifter Shaft | 1 | $20.58 | Add to Cart | |
| 44 | 32P141 | Shifter Fork | 1 | $180.33 | Add to Cart | |
| 45 | 34P82 | Cover, Shifter | 1 | $843.35 | Add to Cart | |
| 328824X | Sub-assembly | 1 | $1,015.43 | Add to Cart | ||
| 47 | 28P61 | O-ring | 1 | $7.18 | Add to Cart | |
| 48 | 28P71 | O-ring | 1 | $4.88 | Add to Cart | |
| 49 | 28P2500 | O-ring | 1 | — | Call for availability | |
| 50 | 34P81 | Cap | 1 | $108.34 | Add to Cart | |
| 52 | 38P50 | Spring | 1 | — | Call for availability | |
| 53 | 65P15 | Cylinder | 1 | $396.31 | Add to Cart | |
| 54 | 66P13 | Piston | 1 | $189.57 | Add to Cart | |
| 56 | 3784309 | Capscrew, Hex Head (.312"-18 X .875") | 2 | $1.76 | Add to Cart | |
| 57 | 379102 | Washer, Spring Retainer | 2 | $9.78 | Add to Cart | |
| 58 | 379103 | Retaining Ring (N-5000-106) | 1 | $1.97 | Add to Cart | |
| 59 | 5008973 | Shipping Plug | 2 | — | No longer available — call for replacement | |
| 60 | 35P14 | Gasket | 2 | $2.88 | Add to Cart | |
| 61 | 3784309 | Capscrew, Hex Head (.312"-18 X .875") | 2 | $1.76 | Add to Cart | |
| 62 | 3784474 | Capscrew, Socket Head (.312"-18 X .75") | 1 | $1.78 | Add to Cart | |
| 63 | 378554 | Poppet Cap | 1 | $12.41 | Add to Cart | |
| 64 | 379652 | Indicator Switch (norm “on”) | 1 | $40.79 | Add to Cart | |
| 65 | 65P23 | Cover, Shifter Shaft | 1 | $20.58 | Add to Cart | |
| 66 | 3784304 | Capscrew, Hex Head | 2 | $6.00 | Add to Cart | |
| 32838840X | Shift Installation Kit, Air-o-matic | USA | $485.40 | Add to Cart |
Power Take-Off Wire Control 721 Series
| Item | Part No. | Description | Qty | Notes | Price | |
|---|---|---|---|---|---|---|
| 70 | 3288301X | Shift Cover Sub-assembly, Wire Control | 1 | $200.05 | Add to Cart | |
| 71 | 3288301X | Shift Cover Sub-assembly, Wire Control (includes Items72-83) | 1 | $200.05 | Add to Cart | |
| 72 | 28P191 | O-ring | 2 | $3.59 | Add to Cart | |
| 73 | 34P74 | Cover, Shifter | 2 | $44.57 | Add to Cart | |
| 74 | 37P14 | Spring Poppet | 2 | $3.46 | Add to Cart | |
| 75 | 51P13 | Lever, Shifter | 2 | $83.49 | Add to Cart | |
| 76 | 50036522 | Flat Washer | 2 | $1.05 | Add to Cart | |
| 77 | 3288291X | Shifter Plate Assembly, Side “x” | 1 | $65.55 | Add to Cart | |
| 78 | 3288292X | Shifter Plate Assembly, Side “y” | 1 | $61.73 | Add to Cart | |
| 79 | 378002 | Ball (.438" Dia.) | 2 | $1.63 | Add to Cart | |
| 80 | 50035610 | Lockwasher | 2 | $1.53 | Add to Cart | |
| 81 | 378004 | Flat Washer | 2 | $2.01 | Add to Cart | |
| 82 | 379652 | Indicator Switch (norm “on”) | 2 | $40.79 | Add to Cart | |
| 83 | 5004096 | Capscrew, Hex Head (.312"-24 X .625") | 2 | $1.23 | Add to Cart | |
| 32834610X | Wire Control Assembly | 1 | $135.56 | Add to Cart | ||
| 328537 | Parts Bag Wire Control (includes Items 1 13-1 19) | 1 | — | Call for availability | ||
| 50P17 | Bracket | 2 | $5.47 | Add to Cart | ||
| 50P19 | Bracket, Swivel | 2 | $3.48 | Add to Cart | ||
| 378019 | Pivot Pin | 2 | $4.50 | Add to Cart | ||
| 378326 | Bushing Nut, Hex | 2 | $2.22 | Add to Cart | ||
| 378982 | Spacer, Mtg | 2 | — | Call for availability | ||
| 5003968 | Screw, Hex Head (.250"-20 X .750") | 2 | $1.17 | Add to Cart | ||
| 5005684 | Set Screw, Square Head (.250"-20 X .500") | 2 | $1.45 | Add to Cart | ||
| 328838X | Installation Kit, Wire Control | 2 | $70.09 | Add to Cart |
Additional Parts Listed in This Manual
| Item | Part No. | Description | Qty | Notes | Price | |
|---|---|---|---|---|---|---|
| 328826-1X | & 3X Air Shift Cover Assembly (includes Items42-66) 1 Or | $1,760.20 | Add to Cart | |||
| 328826-2X | & 4X Air Shift Cover Assembly (includes Items42-66) | 1 | $1,760.20 | Add to Cart |
This is the complete factory parts breakdown for the Chelsea PTO 721 — every part in the manual, matched to our live inventory. We stock 83 of the 99 parts above; click any part number to view it, or add it straight to your cart. Click a number on any diagram to jump to that part.
No parts match that search — try the part number with no dashes.
This Chelsea Illustrated Parts List covering the 721 PTO helps you identify the correct gear sets, shifter kits and service parts for your power take-off before you order.
| Models covered | 721 |
| PTO type | Chelsea 700 Series |
| Document | Illustrated Parts List (Chelsea) |
| Length | 12 pages |
| Format | PDF — free download |
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
Chelsea parts & units we stock
Pro Gear and Transmission stocks new, remanufactured and good-used parts for Chelsea PTO units:
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.
Browse all Chelsea PTO parts — rebuild kits, seal kits, gears & shift covers — or shop complete Chelsea PTO units.