Chelsea PTO 522 Series Parts Manual
This Chelsea Illustrated Parts List covering the 522 PTO helps you identify the correct gear sets, shifter kits and service parts for your power take-off before you order.
| Models covered | 522 |
| PTO type | Chelsea 500 Series |
| Document | Illustrated Parts List (Chelsea) |
| Length | 17 pages |
| Format | PDF — 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
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 522 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. 123 of the 204 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.
Bill of Materials — manual page 6
| Item | Part number | Description | Qty | Order |
|---|---|---|---|---|
| 1-P-599X | P.T.O. Housing w/Dowel Pin call to confirm availability | 1 | ||
| 1-P-608X | P.T.O. Housing w/Dowel Pin ("R" Housing) ? call to confirm availability | |||
| 2 | 379920 | Dowel Pin call to confirm availability | 2 | |
| 3 | 560990 | Ball Bearing, Input Shaft call to confirm availability | 1 | |
| 4 | 378098 | Snap Ring, Input Shaft no longer available — call for a replacement | 1 | |
| 5 | 5-P-1388 | Input Gear, ''T' Ratio (31 Teeth) 1 or | ▶ Add | |
| 5-P-1389 | Input Gear, "V" Ratio (34 Teeth) call to confirm availability | 1 | ||
| 6 | 3-P-967 | Input Shaft, "AA" Input 1 or call to confirm availability | ||
| 7 | 561016 | Input Bearing, Needle Roller, "AA" Input" 1 or call to confirm availability | ||
| 8 | 22-P-115 | Gasket, Housing | 1 | ▶ Add |
| 9 | 21-P-664 | Rear Mounting Plate, "AA" Input 1 or call to confirm availability | ||
| 10 | 379676-6 | Hex Capscrew, (M12 1.5 x 25) no longer available — call for a replacement | 2 | |
| 11 | 561017 | Bearing, Cylindrical Roller call to confirm availability | 1 | |
| 12 | 379918 | Snap Ring, Shifter Rod call to confirm availability | 2 | |
| 13 | 2-P-821 | Output Gear, "T" Ratio (23 Teeth) 1 or | ▶ Add | |
| 2-P-822 | Output Gear, "V" Ratio (20 Teeth) call to confirm availability | 1 | ||
| 14 | 32-P-183 | Shifter Fork call to confirm availability | 1 | |
| 15 | 37-P-21 | Shifter Spring | 1 | ▶ Add |
| 16 | 11-P-155 | Shifter Rod call to confirm availability | 1 | |
| 17 | 28-P-41 | O-Ring, Shifter Rod | 1 | ▶ Add |
| 18 | 3-P-959 | Output Shaft, "XY" 1 or call to confirm availability | ||
| 19 | 561018 | Output Bearing | 1 | ▶ Add |
| 20 | 379919 | Snap Ring, Internal | 1 | ▶ Add |
| 21 | 378477 | Snap Ring, Output Shaft | 1 | ▶ Add |
| 22 | 28-P-278 | Oil Seal | 1 | ▶ Add |
| 23 | 500897-3 | Shipping Plug no longer available — call for a replacement | 1 | |
| 24 | 379652 | Indicator Switch, Normally Closed | 1 | ▶ Add |
| 379633 | Indicator Switch, Normally Closed ("E" Shift Option) ? | ▶ Add | ||
| 25 | 35-P-93 | Gasket, Cover Plate | 1 | ▶ Add |
| 26 | 34-P-133 | Cover Plate | 1 | ▶ Add |
| 27 | 378429-6 | Hex Capscrew, (.250" 20 x .625") | 4 | ▶ Add |
| 28 | 68-P-2 | Name Plate | 1 | ▶ Add |
| 29 | 378422 | Drive Screw | 2 | ▶ Add |
| 328388-37X | Installation Kit ("A" Shifter) no longer available — call for a replacement | 1 | ||
| 328388-47X | Installation Kit ("P" Shifter) | 1 | ▶ Add | |
| 328388-48X | Installation Kit ("Q" Shifter) | 1 | ▶ Add | |
| 328388-82X | Installation Kit ("P' Shifter "AC" Input Only) | 1 | ▶ Add | |
| 378414 | Pressure Protection Valve ("V" Shift Only) | 1 | ▶ Add | |
| 379640 | Booted connector ("V" Shifter Only) | 1 | ▶ Add | |
| 329431-1X | Gasket & Seal Service Kit ("AA", "AB", "AM" Input) call to confirm availability | 1 | ||
| 329431-2X | Gasket & Seal Service Kit ("AC" Input) no longer available — call for a replacement | 1 | ||
| 329431-3X | Gasket & Seal Service Kit ("AD" Input) call to confirm availability | 1 | ||
| 329432-1X | Bearing Service Kit ("AA", "AB" & "AM" Input) call to confirm availability | 1 | ||
| 329432-2X | Bearing Service Kit ("AC" & "AD" Input) no longer available — call for a replacement | 1 |
Parts list (page 7) — manual page 7
| Item | Part number | Description | Qty | Order |
|---|---|---|---|---|
| 11 ' 12 I | ||||
| 328388-82X | 12V Electric/Air Installation Kit w/ZMTEC Wire Harness | ▶ Add | ||
| 1 | 378416 | Hex Nipple, (.25 18 NPTF) | 1 | ▶ Add |
| 2 | 378414 | Pressure Protection Valve 1 | ▶ Add | |
| 3 | 379042 | Male Connector, 1/4" Tube to Male Pipe (.125" 25 NPT) | 3 | ▶ Add |
| 4 | 379044-7 | Plastic Tubing call to confirm availability | 1 | |
| 5 | 75-P-10 | Solenoid, 12V 1 | ▶ Add | |
| 6 | 379106 | Atmospheric Breather (.125" 27 NPTF) 1 | ▶ Add | |
| 7 | 500357-7 | Lock Washer | 2 | ▶ Add |
| 8 | 500457-6 | Round Head Slotted Screw (.438" x .190" 32 UNF- 2A) | 2 | ▶ Add |
| 9 | 379258 | Bracket | 1 | ▶ Add |
| 10 | 379043 | Male Elbow 90° 1/4" Tube to Pipe (.125" 27 NPTF) | 1 | ▶ Add |
| 12 | 379257 | Connector 1 | ▶ Add | |
| 17 | 75-P-9 | Wiring Harness (includes items 13, 14, 15 & 16) | 1 | ▶ Add |
| 13 | 379900 | Fuse, 10 AMP 1 | ▶ Add | |
| 14 | 379336 | Switch Bracket 1 | ▶ Add | |
| 15 | 378978 | Indicator Light, 12V | 1 | ▶ Add |
| 16 | 75-P-11 | Switch, P.T.O call to confirm availability | 1 | |
Parts list (page 8) — manual page 8
| Item | Part number | Description | Qty | Order |
|---|---|---|---|---|
| 9 | 21-P-658 | Mounting Plate call to confirm availability | 1 | |
| 6 | 3-P-958 | Input Shaft, (12 Tooth 40mm Internal Spline) call to confirm availability | 1 | |
| 7 | 561016 | Needle Roller Bearing call to confirm availability | 1 | |
| 328952-20X | Gasket and Caution Label Kit call to confirm availability | 1 | ||
| 9 | 21-P-664 | Mounting Plate call to confirm availability | 1 | |
| 6 | 3-P-967 | Input Shaft, (12 Tooth 40mm Internal Spline) call to confirm availability | 1 | |
| 7 | 561016 | Needle Roller Bearing call to confirm availability | 1 | |
| 328952-20X | Gasket and Caution Label Kit call to confirm availability | 1 |
Parts list (page 9) — manual page 9
| Item | Part number | Description | Qty | Order |
|---|---|---|---|---|
| 9 | 21-P-665 | Mounting Plate call to confirm availability | 1 | |
| 6 | 3-P-958 | Input Shaft, (12 Tooth 40mm Internal Spline) call to confirm availability | 1 | |
| 7 | 561016 | Needle Roller Bearing call to confirm availability | 1 | |
| 328952-20X | Gasket and Caution Label Kit call to confirm availability | 1 | ||
| 9 | 21-P-668 | Mounting Plate call to confirm availability | 1 | |
| 6 | 3-P-965 | Input Shaft, (14 Tooth 32mm External Spline) call to confirm availability | 1 | |
| 7 | 550010 | Ball Bearing | 1 | ▶ Add |
| 328952-21X | Gasket and Caution Label Kit call to confirm availability | 1 |
Parts list (page 10) — manual page 10
| Item | Part number | Description | Qty | Order |
|---|---|---|---|---|
| 2 | 21-P-658 | Mounting Plate ("AE" Input) call to confirm availability | 1 | |
| 5 | 3-P-984 | Input Shaft (17 Tooth 37MM Spline) call to confirm availability | 1 | |
| 8 | 561016 | Needle Roller Bearing call to confirm availability | 1 | |
| 29 | 26-P-74 | Adapter Plate call to confirm availability | 1 | |
| 328952-20X | Gasket & Caution Label Kit call to confirm availability | 1 | ||
| 35-P-98 | Gasket for Adapter Plate call to confirm availability | 1 |
Parts list (page 11) — manual page 11
| Item | Part number | Description | Qty | Order |
|---|---|---|---|---|
| 1 | 500007-29 | Woodruff Key | ▶ Add | |
| 1 | 501181 | Hex Lock Nut no longer available — call for a replacement | ||
| 2 | 379111 | Square Key | ▶ Add |
Bill of Materials — manual page 13
| Item | Part number | Description | Qty | Order |
|---|---|---|---|---|
| 329090-1X | Valve Kit call to confirm availability | |||
| 328388-46X | Inst Kit Parts Bag | ▶ Add | ||
| 328863X | Valve Air Control call to confirm availability | 1 | ||
| 379900 | Ass'y Fuse | 1 | ▶ Add | |
| 378414 | Valve, Pressure Protection | 1 | ▶ Add | |
| 378416 | Hex Nipple | 1 | ▶ Add | |
| 379042 | Male Connector | 2 | ▶ Add | |
| 329431-1X | Service Kit, Sealing (AA,AB,AM) call to confirm availability | |||
| 379043 | Male Elbow | 1 | ▶ Add | |
| 22-P-115 | Gasket Housing/ Backplate | 1 | ▶ Add | |
| 379253 | Ring Connector | 1 | ▶ Add | |
| 22-P-117 | Gasket Mounting call to confirm availability | 1 | ||
| 379257 | Splice Connector | 1 | ▶ Add | |
| 28-P-41 | 0-Ring Shifter Rod | 1 | ▶ Add | |
| 379306 | Fork Connector | 4 | ▶ Add | |
| 28-P-278 | Oil Seal Output Shaft | 1 | ▶ Add | |
| 500357-7 | Lockwasher | 2 | ▶ Add | |
| 35-P-93 | Gasket Cover Plate | 1 | ▶ Add | |
| 500457-6 | Slotted Screw | 2 | ▶ Add | |
| 379904 | Push Connector | 1 | ▶ Add | |
| 329431-2X | Service Kit, Sealing (AC Input) no longer available — call for a replacement | |||
| 328388-47X | 12V Electric Over | ▶ Add | ||
| 22-P-115 | Gasket Housing/ Backplate | 1 | ▶ Add | |
| 328388-46X | Inst Kit Parts Bag | 1 | ▶ Add | |
| 28-P-41 | 0-Ring Shifter Rod | 1 | ▶ Add | |
| 378414 | Pressure Port | 1 | ▶ Add | |
| 28-P-278 | Oil Seal Output Shaft | 1 | ▶ Add | |
| 378881 | Rocker Switch no longer available — call for a replacement | 1 | ||
| 35-P-93 | Gasket Cover Plate | 1 | ▶ Add | |
| 378978 | lndicator | 1 | ▶ Add | |
| 35-P-94 | Gasket Mounting | 1 | ▶ Add | |
| 379044-7 | Nylon Tubing call to confirm availability | 1 | ||
| 379252 | Butt Connector | 2 | ▶ Add | |
| 379258 | Bracket | 1 | ▶ Add | |
| 329431-3X | Service Kit, Sealing (AD Input) call to confirm availability | |||
| 379303-1 | Valve 12V | 1 | ▶ Add | |
| 22-P-115 | Gasket Housing/ Backplate | 1 | ▶ Add | |
| 379336 | Switch Bracket | 1 | ▶ Add | |
| 28-P-41 | 0-Ring Shifter Rod | 1 | ▶ Add | |
| 379254-3 | Wire, Green | 1 | ▶ Add | |
| 28-P-278 | Oil Seal Output Shaft | 1 | ▶ Add | |
| 379106 | Breather-Cap | 1 | ▶ Add | |
| 35-P-93 | Gasket Cover Plate | 1 | ▶ Add | |
| 379640 | Booted Connector | 1 | ▶ Add | |
| 35-P-97 | Gasket Mounting call to confirm availability | 1 | ||
| 328388-48X | 24V Electric Over | ▶ Add | ||
| 379640 | Booted Connector | 1 | ▶ Add | |
| 329432-1X | Service Kit, Bearing (AA,AB,AM) call to confirm availability | |||
| 328388-46X | Inst Kit Parts Bag | 1 | ▶ Add | |
| 378098 | Snap Ring (Input Shaft) no longer available — call for a replacement | 1 | ||
| 378414 | Pressure Port | 1 | ▶ Add | |
| 378477 | Snap Ring (Output Shaft) | 1 | ▶ Add | |
| 378881 | Rocker Switch no longer available — call for a replacement | 1 | ||
| 379918 | Snap Ring (Shifter Rod) call to confirm availability | 1 | ||
| 379005 | lndicator no longer available — call for a replacement | 1 | ||
| 379919 | Snap Ring (Internal) | 1 | ▶ Add | |
| 379044-7 | Nylon Tubing call to confirm availability | 1 | ||
| 560990 | Ball Bearing (Input Shaft) call to confirm availability | 1 | ||
| 379252 | Butt Connector | 1 | ▶ Add | |
| 561016 | Bearing Needle Roller (Input Shaft) call to confirm availability | 1 | ||
| 379258 | Bracket | 1 | ▶ Add | |
| 561017 | Bearing Cylindrical Roller (Output Shaft) call to confirm availability | 1 | ||
| 379303-2 | Valve 24V | 1 | ▶ Add | |
| 561018 | Ball Bearing (Output Shaft) | 1 | ▶ Add | |
| 379336 | Switch Bracket | 1 | ▶ Add | |
| 379106 | Breather-Cap | 1 | ▶ Add | |
| 329432-2X | Service Kit, Bearing (AC & AD) no longer available — call for a replacement | |||
| 379254-3 | Wire, Green | 1 | ▶ Add | |
| 378098 | Snap Ring (Input Shaft) no longer available — call for a replacement | 1 | ||
| 378477 | Snap Ring (Output Shaft) | 1 | ▶ Add | |
| 328388-82X | Air Shift Kit Freedomline | ▶ Add | ||
| 379918 | Snap Ring (Shifter Rod) call to confirm availability | 1 | ||
| 378416 | Hex Nipple | 1 | ▶ Add | |
| 379919 | Snap Ring ( nternal) | 1 | ▶ Add | |
| 379042 | Male Connector | 3 | ▶ Add | |
| 550010 | Ball Bearing (Input Shaft) | 1 | ▶ Add | |
| 379043 | Male Elbow | 1 | ▶ Add | |
| 560990 | Bearing Needle Roller (Input Shaft) call to confirm availability | 1 | ||
| 379253 | Ring Connector | 1 | ▶ Add | |
| 561017 | Bearing Cylindrical Roller (Output Shaft) call to confirm availability | 1 | ||
| 379257 | Splice Connector | 1 | ▶ Add | |
| 561018 | Ball Bearing (Output Shat ) | 1 | ▶ Add | |
| 500357-7 | Lockwasher | 2 | ▶ Add | |
| 500457-6 | Slotted Screw | 2 | ▶ Add | |
| 328388-37X | Air Shift no longer available — call for a replacement | |||
| 378414 | Pressure Port | 1 | ▶ Add | |
| 328388-44X | Air Shift | 1 | ▶ Add | |
| 379044-7 | Nylon Tubing call to confirm availability | 1 | ||
| 329090-1X | Valve Kit call to confirm availability | 1 | ||
| 379258 | Bracket | 1 | ▶ Add | |
| 379044-7 | Nylon Tubing call to confirm availability | 1 | ||
| 75-P-10 | Air Solenoid | 1 | ▶ Add | |
| 379130 | Support Bracket | 2 | ▶ Add | |
| 75-P-9 | Wiring Harness | 1 | ▶ Add | |
| 68-P-27 | Control Plate | 1 | ▶ Add | |
| 379106 | Breather-cap | 1 | ▶ Add | |
| 379640 | Booted Connector | 1 | ▶ Add | |
| 328388-44X | Air Shift Kit | ▶ Add | ||
| 328946X | Caution Label Kit no longer available — call for a replacement | 1 | ||
| 378416 | Hex Nipple | 1 | ▶ Add | |
| 379085-1 | P.T.O. Instructions Decal | 1 | ▶ Add | |
| 378978 | lndicator | 1 | ▶ Add | |
| 379281-1 | Gasket, Envelope call to confirm availability | 1 | ||
| 379042 | Male Connector | 2 | ▶ Add | |
| 79624 | Product Warranty Card call to confirm availability | 1 | ||
| 379043 | Male Elbow | 1 | ▶ Add | |
| 22-P-117 | Mounting Gasket call to confirm availability | 1 | ||
| 379252 | Butt Connector | 2 | ▶ Add | |
| 500357-7 | Lockwasher | 8 | ▶ Add | |
| 500376-6 | Nut 10-24 no longer available — call for a replacement | 4 | ||
| 500448-9 | Screw Slot | 4 | ▶ Add | |
| 379900 | Ass'y Fuse | 1 | ▶ Add | |
| 379904 | Push Connector | 1 | ▶ Add |
Bill of Materials — manual page 14
| Item | Part number | Description | Qty | Order |
|---|---|---|---|---|
| 328952-21X | Gasket and Caution Label Kit call to confirm availability | 1 | ||
| 379676-15 | Capscrew Socket Head M12 x 80 Lg (1. 75 Pitch) | 4 | ▶ Add | |
| 379140-7 | M12 Lockwasher | 4 | ▶ Add | |
| 379740-7 | Capscrew Socket Head M10 x 30 LG (1.5 Pitch) | 9 | ▶ Add | |
| 379140-8 | Lockwasher M10 call to confirm availability | 7 |
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.