Chelsea PTO 278 Series Parts Manual
Model Number Designation
| Item | Part No. | Description | Qty | Notes | Price |
|---|
Parts List 278 Series Bill of Materials
Click a number on the diagram to highlight that part below.
| Item | Part No. | Description | Qty | Notes | Price | |
|---|---|---|---|---|---|---|
| 1 | 1P591X | Housing Ass'y 3 (includes Item # 11) | 1 | $1,914.48 | Add to Cart | |
| 2 | 560972 | Needle Bearing | 1 | $32.22 | Add to Cart | |
| 3 | 550439 | Tapered Bearing Cone | 2 | $51.63 | Add to Cart | |
| 4 | SEECHARTPG14 | Input Gear | 1 | — | Call for availability | |
| 5 | 14P741 | Spacers (.112 .114) | A.R. | $20.46 | Add to Cart | |
| 14P742 | Spacers (.115 .117) | A.R. | $38.26 | Add to Cart | ||
| 14P743 | Spacers (.118 .120) | A.R. | $50.79 | Add to Cart | ||
| 14P744 | Spacers (.121 .123) | A.R. | $54.63 | Add to Cart | ||
| 14P745 | Spacers (.124 .126) | A.R. | $16.83 | Add to Cart | ||
| 6 | 28P191 | O-ring | 1 | $3.59 | Add to Cart | |
| 7 | 9P91 | Idler Shaft, Pressure Lube | 1 | $81.03 | Add to Cart | |
| 8 | 379672 | Nwd Plug | 1 | $12.09 | Add to Cart | |
| 9 | 9P102 | Thrust Washer | 1 | $127.18 | Add to Cart | |
| 50059716 | Slotted Pin | 1 | $1.18 | Add to Cart | ||
| 32935212X | Valve And Valve Cap Assembly (12 Volt) | 1 | $591.82 | Add to Cart | ||
| 32935224X | Valve And Valve Cap Assembly (24 Volt) Assemblies Include Items 12 Thru 19 | 1 | $531.73 | Add to Cart | ||
| 12 | 28P193 | Block Ring | 1 | $17.08 | Add to Cart | |
| 13 | 329144X | Valve Cap Assembly (12 Volt) | 1 | $129.01 | Add to Cart | |
| 3291441X | Valve Cap Assembly (24 Volt) | 1 | — | No longer available — call for replacement | ||
| 14 | 3796041 | Solenoid Valve (12 Volt) | 1 | $183.76 | Add to Cart | |
| 3796042 | Solenoid Valve (24 Volt) | $216.15 | Add to Cart | |||
| 15 | 34P278 | Valve Cover | 1 | $136.17 | Add to Cart | |
| 16 | 379565 | Hex Capscrew ( .250"-20 X .750") | 4 | $2.90 | Add to Cart | |
| 17 | 28P119 | Oil Seal | 1 | $26.61 | Add to Cart | |
| 18 | 378811 | Washer | 1 | $5.21 | Add to Cart | |
| 19 | 378849 | Retaining Ring | 1 | $2.12 | Add to Cart | |
| 20 | 22P112 | Gasket, Valve Cover | 1 | $20.18 | Add to Cart | |
| 21 | 3784476 | Socket Head Capscrew ( .312"-18 X 1 .000") | 3 | $4.33 | Add to Cart | |
| SEECHARTPG14 | Output Shaft & Clutch Assembly (includes Items 22 Thru 34) | — | Call for availability | |||
| 22 | 14P49 | Spacer | 1 | $12.74 | Add to Cart | |
| 23 | 379746 | Retaining Ring | 1 | $5.06 | Add to Cart | |
| 24 | SEECHARTPG14 | Output Shaft | 1 | — | Call for availability | |
| 25 | 2P458 | Clutch Gear | 1 | $186.14 | Add to Cart | |
| 26 | 379485 | Friction Disc | 8 | $14.45 | Add to Cart | |
| 27 | 379595 | Clutch Plate | 7 | $14.47 | Add to Cart | |
| 28 | 28P244 | O-ring | 2 | $5.03 | Add to Cart | |
| 29 | 37P39 | Return Spring | 1 | $6.55 | Add to Cart | |
| 328895X | Piston & Cylinder Assembly (includes Items 30-32) | — | Call for availability | |||
| 30 | 28P121 | Block Vee Ring | 1 | $15.56 | Add to Cart | |
| 328676X | Piston Assembly (includes Items 31 And 32) | $129.64 | Add to Cart | |||
| 31 | 379133 | Piston | 1 | — | No longer available — call for replacement | |
| 32 | 378856 | Wiggler Wire | 1 | $1.05 | Add to Cart | |
| 33 | 378760 | Clutch Back Up Cylinder | 1 | $268.17 | Add to Cart | |
| 34 | 378576 | Retaining Ring Output Gear Assembly (includes Items 35 And 36) | 1 | $3.16 | Add to Cart | |
| 32900511X12X | “b” Ratio / “b” Ratio Super Torque | — | Call for availability | |||
| 3290051X6X | “d” Ratio / “d” Ratio Super Torque | — | Call for availability | |||
| 3290052X7X | “g” Ratio / “g” Ratio Super Torque | — | Call for availability | |||
| 32900513X15X | “m” Ratio / “m” Ratio Super Torque | — | Call for availability | |||
| 32900514X16X | “s” Ratio / “s” Ratio Super Torque | — | Call for availability | |||
| 3290055X10X | “t” Ratio / “t” Ratio Super Torque | — | Call for availability | |||
| 35 | SEECHARTPG14 | Output Gear | 1 | — | Call for availability | |
| 36 | 560972 | Needle Bearing | 1 | $32.22 | Add to Cart | |
| 37 | 31P70 | Thrust Washer | 1 | $13.66 | Add to Cart | |
| 38 | 379746 | Retaining Ring | 1 | $5.06 | Add to Cart | |
| 39 | 4P147 | Spacer, Drive Shaft | 1 | $33.30 | Add to Cart | |
| 40 | 550010 | Ball Bearing | 1 | $47.93 | Add to Cart | |
| 378895 | Retaining Ring | 1 | $7.41 | Add to Cart | ||
| 378576 | Retaining Ring | 1 | $3.16 | Add to Cart | ||
| 28P225 | Oil Seal | 1 | $19.01 | Add to Cart | ||
| 50000729 | Woodruff Key | 1 | $3.11 | Add to Cart | ||
| 22P101 | Gasket, Bearing Cap | 1 | $15.38 | Add to Cart | ||
| 3784478 | Socket Head Capscrew ( .312"-18 X 1 .500") | 4 | $2.32 | Add to Cart | ||
| 379659 | Run Tee, Pressure Lube Only | 1 | $51.56 | Add to Cart | ||
| 379660 | Steel Tubing Pressure Lube Only , | 1 | — | No longer available — call for replacement | ||
| 379231 | Pipe Plug .125"-27 Nptf, W/o E .o.c. Only | 1 | $1.50 | Add to Cart | ||
| 379242 | O-ring Boss Plug W/o E .o.c. Only , | 1 | $22.23 | Add to Cart | ||
| 28P171 | O-ring W/ E .o.c. Only , | 1 | $4.88 | Add to Cart | ||
| 379243 | Speed Sensor, W/ E .o.c. Only | 1 | $229.65 | Add to Cart | ||
| 379502 | Pressure Switch Assembly | 1 | $93.06 | Add to Cart | ||
| 379486 | Straight Thread Connector 90° | 1 | $28.97 | Add to Cart | ||
| 35P74 | Mounting Gasket | 1 | $7.13 | Add to Cart | ||
| 7170107X | Stud Kit (includes Items 57 And 58) | 1 | $122.41 | Add to Cart | ||
| 37942818 | Stud M10-1 .5 & .375-24 X 2 .000 , | 2 | $8.32 | Add to Cart | ||
| 37945310 | Ferry Capscrew (M10-1 .5 X 35mm) | 8 | $6.86 | Add to Cart | ||
| 379744 | Flange Nut, .375-24 | 2 | $1.63 | Add to Cart | ||
| 278XR3 | 278X***P-*3* | — | Call for availability | |||
| 328748X | Pump Mounting Kit, For “xr” Pump Only | 1 | $65.88 | Add to Cart | ||
| 3289489X | Gasket & Installation Instructions | 1 | $42.19 | Add to Cart | ||
| 32902412X | Installation Kit 12V, Less E .o.c. | 1 | $272.23 | Add to Cart | ||
| 32902424X | Installation Kit 24V, Less E .o.c. | 1 | $304.69 | Add to Cart | ||
| 329076X | Installation Kit 12V, With E .o.c. | 1 | $152.30 | Add to Cart | ||
| 32892412X | Control Box 12V, With E .o.c. | 1 | $1,358.05 | Add to Cart | ||
| 32892424X | Control Box 24V, With E .o.c. Service Kits | 1 | — | Call for availability | ||
| 32907119X | Gasket & Seal Kit | 1 | $166.75 | Add to Cart | ||
| 32907133X | Gasket & Seal Kit (“xy” Output Only) | 1 | $152.16 | Add to Cart | ||
| 3290715X | Bearing Kit | 1 | $193.20 | Add to Cart | ||
| 3290717X | Clutch Repair Kit | 1 | $512.67 | Add to Cart | ||
| 32917512X | E .o.c. Field Conversion Kit 12V, Remote Valve | 1 | $1,568.56 | Add to Cart | ||
| 32917524X | E .o.c. Field Conversion Kit 24V, Remote Valve | 1 | $675.81 | Add to Cart | ||
| 5P912 | 50/25 2-P-811 50 329005-11X | $935.27 | Add to Cart | |||
| 5P913 | 50/28 2-P-688 47 329005-1X | $1,034.20 | Add to Cart | |||
| 5P914 | 50/31 2-P-684 44 329005-2X | $1,020.95 | Add to Cart | |||
| 5P915 | 50/35 2-P-814 40 329005-13X | $923.32 | Add to Cart | |||
| 5P1173 | 50/39 2-P-815 36 329005-14X | $927.84 | Add to Cart | |||
| 5P1409 | 50/42 2-P-756 33 329005-5X | $426.24 | Add to Cart | |||
| 5P1350 | 50/25 2-P-812 50 329005-12X | $1,075.45 | Add to Cart | |||
| 5P1293 | 50/28 2-P-800 47 329005-6X | $1,085.95 | Add to Cart | |||
| 5P1225 | 50/31 2-P-790 44 329005-7X | $1,200.80 | Add to Cart | |||
| 5P1351 | 50/35 2-P-816 40 329005-15X | $1,075.45 | Add to Cart | |||
| 5P1278 | 50/39 2-P-817 36 329005-16X | — | Call for availability | |||
| 5P1410 | 50/42 2-P-789 33 329005-10X | $522.64 | Add to Cart | |||
| ITEMNO24 | Ass’y No. | — | Call for availability | |||
| 3P831 | 329006-1X 21 -P-480 28-P-225 | $696.83 | Add to Cart | |||
| 3P832 | 329006-2X 21 -P-482 28-P-225 | $870.16 | Superseded by 3P832XAdd to Cart | |||
| 3P833 | 329006-3X 21 -P-484 28-P-225 | — | Call for availability | |||
| 3P852 | 329006-4X 21 -P-524 28-P-230 | — | Call for availability | |||
| 3P853 | 329006-5X 21 -P-480 28-P-225 | — | Call for availability | |||
| 3P892 | 329006-6X 21 -P-576 28-P-225 | — | Call for availability | |||
| 3P925 | 329006-8X 21 -P-484 28-P-225 | 21 -P-628 | — | Call for availability |
278 Series Model Number Designation and PTO Housing Dimensions
| Item | Part No. | Description | Qty | Notes | Price | |
|---|---|---|---|---|---|---|
| 2550D3847 | Xy = Din 5462 | — | Call for availability | |||
| 3144M3541 | Xx = Din 100 Rf = Rotatable S.a.e. “bb” 2 Bolt Rg = Rotatable S.a.e. “bb” 4 Bolt | — | Call for availability | |||
| VALVECAPROTATED120 | Shifter Type B = 12V Hydraulic Valve D = 24V Hydraulic Valve G = 12V Remote Valve Without E.o.c. H = 24V Remote Valve Without E.o.c. K = 12V Hydraulic Valve With E.o.c. | — | Call for availability |
278 Series Shift Installation Kit Without Electronic Overspeed Control (SK-347)
| Item | Part No. | Description | Qty | Notes | Price | |
|---|---|---|---|---|---|---|
| 32902412X | 12 Volt Shift Installation Kit | 1 | $272.23 | Add to Cart | ||
| 32902424X | 24 Volt Shift Installation Kit | 1 | $304.69 | Add to Cart | ||
| 59 | 378881 | Switch | 1 | $111.97 | Add to Cart | |
| 60 | 378884 | Fuse, 9 Amp | 1 | $5.99 | Add to Cart | |
| 61 | 378978 | Indicator Light, 12 Volt | 1 or | $25.82 | Add to Cart | |
| 379005 | Indicator Light, 24 Volt | 1 | — | No longer available — call for replacement | ||
| 62 | 379257 | Connector, Splice | 1 | $2.91 | Add to Cart | |
| 63 | 379265 | Grommet | 1 | $3.21 | Add to Cart | |
| 64 | 379306 | Fork Connector | 3 | $2.50 | Add to Cart | |
| 65 | 379336 | Bracket | 1 | $10.11 | Add to Cart | |
| 66 | 379504 | Valve Connector & Wire | 1 | $52.22 | Add to Cart | |
| 67 | 379502 | Pressure Switch | 1 | $93.06 | Add to Cart |
278 Series Shift Installation Kit with Electronic Overspeed Control (SK-348)
| Item | Part No. | Description | Qty | Notes | Price | |
|---|---|---|---|---|---|---|
| 329076X | Shift Installation Kit | 1 | $152.30 | Add to Cart | ||
| 68 | 379257 | Connector, Splice | 1 | $2.91 | Add to Cart | |
| 69 | 379265 | Grommet | 1 | $3.21 | Add to Cart | |
| 70 | 379502 | Pressure Switch | 1 | $93.06 | Add to Cart | |
| 71 | 379504 | Valve Connector & Wire | 1 | $52.22 | Add to Cart | |
| 379252 | Butt Connector | 1 | $2.30 | Add to Cart | ||
| 379061 | Wire Tie | 6 | $1.46 | Add to Cart | ||
| 72 | 32892412X | Chelsea E .o.c. 12 Volt , | 1 | $1,358.05 | Add to Cart | |
| 32892424X | Chelsea E .o.c. 24 Volt , | 1 | — | Call for availability | ||
| 32917512X | E .o.c. Field Conversion Kit, 12 Volt (includes 329076X And Items 52 53 And 72) , | $1,568.56 | Add to Cart | |||
| 32917524X | E .o.c. Field Conversion Kit, 24 Volt (includes 329076X And Items 52 53 And 72) , Speed Sensor Extension Cable* | $675.81 | Add to Cart | |||
| 32892310X | 10' Extension Cable, Supplied With E .o.c. | 1 or | — | No longer available — call for replacement | ||
| 3289235X | 5' Extension Cable, Optional | — | No longer available — call for replacement |
278 Series Shift Installation Kit with Remote Solenoid (SK-349)
| Item | Part No. | Description | Qty | Notes | Price | |
|---|---|---|---|---|---|---|
| 32923712X | 12 Volt Shift Installation Kit | $763.42 | Add to Cart | |||
| 32923724X | 24 Volt Shift Installation Kit | $763.42 | Add to Cart | |||
| 74 | 329230X | Connector Wire | 1 | — | No longer available — call for replacement | |
| 75 | 329231X | Valve Connector & Wire | 1 | $123.35 | Add to Cart | |
| 76 | 378881 | Switch | 1 | $111.97 | Add to Cart | |
| 77 | 378884 | Fuse Holder, 9 Amp | 1 | $5.99 | Add to Cart | |
| 78 | 378978 | Indicator Light, 12 Volt | 1 or | $25.82 | Add to Cart | |
| 379005 | Indicator Light, 24 Volt | 1 | — | No longer available — call for replacement | ||
| 79 | 379252 | Butt Connector | 2 | $2.30 | Add to Cart | |
| 80 | 379257 | Splice Connector | 1 | $2.91 | Add to Cart | |
| 81 | 379258 | Mounting Bracket, Solenoid | 1 | $5.11 | Add to Cart | |
| 82 | 379265 | Grommet | 1 | $3.21 | Add to Cart | |
| 83 | 379306 | Fork Connector | 3 | $2.50 | Add to Cart | |
| 84 | 379336 | Name & Plate Bracket | 1 | $10.11 | Add to Cart | |
| 85 | 379449 | Male Connector | 2 | $13.18 | Add to Cart | |
| 86 | 379502 | Pressure Switch | 1 | $93.06 | Add to Cart | |
| 87 | 3796861 | Solenoid Valve, 12 Volt | 1 or | $473.29 | Add to Cart | |
| 3796862 | Solenoid Valve, 24 Volt | 1 | $466.27 | Add to Cart | ||
| 88 | 5003577 | Lockwasher | 2 | $1.07 | Add to Cart | |
| 89 | 5004576 | Mounting Screw ( .790"-32x.438") | 2 | $1.12 | Add to Cart | |
| 90 | 329075X | Hose Assembly | 1 | — | Call for availability | |
| 91 | 3291301X | Hose Assembly | 1 | $87.33 | Add to Cart | |
| 92 | 379486 | 90° Fitting (install In Transmission High Pressure Port) Pressure Lube Hose Assembly | 1 | $28.97 | Add to Cart |
278 Series Pump Conversion Kits
| Item | Part No. | Description | Qty | Notes | Price | |
|---|---|---|---|---|---|---|
| 32916021X | “xk” Output | $1,521.81 | Add to Cart | |||
| 32916022X | “xr” Output | $513.68 | Add to Cart | |||
| 32916023X | “xp” Output | $635.70 | Add to Cart | |||
| 32916025X | “af” Output | $635.70 | Add to Cart | |||
| 32916037X | “ra” Output | $1,272.07 | Add to Cart | |||
| 32916038X | “rb” Output | $1,272.07 | Add to Cart | |||
| 32916039X | “rf” Output | $585.68 | Add to Cart | |||
| 32916045X | “rg” Output | $555.03 | Add to Cart | |||
| 17 | 28P119 | Oil Seal High Pressure , | 1 | $26.61 | Add to Cart | |
| 19 | 378849 | Retaining Ring | 1 | $2.12 | Add to Cart | |
| 20 | 22P112 | Gasket, Valve Cap | 1 | $20.18 | Add to Cart | |
| 23 | 379746 | Retaining Ring | 1 | $5.06 | Add to Cart | |
| 24 | 3P832 | Output Shaft, Xk & Xp Outputs | 1 or | $870.16 | Superseded by 3P832XAdd to Cart | |
| 3P833 | Output Shaft, Xr, Ra, & Rb Outputs | 1 | — | Call for availability | ||
| 3P925 | Output Shaft, Rf Output | 1 | — | Call for availability | ||
| 3P892 | Output Shaft, Af Output | 1 | — | Call for availability | ||
| 28 | 28P244 | O-ring | 2 | $5.03 | Add to Cart | |
| 30 | 28P121 | Block -v- Ring | 1 | $15.56 | Add to Cart | |
| 34 | 378576 | Retaining Ring | 1 | $3.16 | Add to Cart | |
| 38 | 379746 | Retaining Ring | 1 | $5.06 | Add to Cart | |
| 41 | 21P482 | Bearing Cap, Xk Output | 1 or | $362.51 | Add to Cart | |
| 21P484 | Bearing Cap, Xr Output | 1 | $408.05 | Add to Cart | ||
| 21P568 | Bearing Cap, Xp Output | 1 | — | No longer available — call for replacement | ||
| 21P576 | Bearing Cap, Af Output | 1 | $259.97 | Add to Cart | ||
| 21P572 | Pump Flange, Rb & Rg Output & 21 -P-484 Brg Cap | 1 | $114.69 | Add to Cart | ||
| 21P628 | Pump Flange, Ra & Rf Outputs & 21 -P-484 Brg Cap | 1 | $100.24 | Add to Cart | ||
| 43 | 378576 | Retaining Ring | 1 | $3.16 | Add to Cart | |
| 44 | 28P225 | Oil Seal | 1 | $19.01 | Add to Cart | |
| 46 | 22P101 | Gasket, Bearing Cap | 1 | $15.38 | Add to Cart | |
| 47 | 3784478 | Socket Head Capscrew ( .3125"-18 X 1 .500") | 4 | $2.32 | Add to Cart | |
| 3784476 | Socket Head Capscrew ( .3125"-18 X 1 .000")(Rotatable Flange) | 4 | $4.33 | Add to Cart | ||
| 328748X | Pump Mounting Kit, Xr Output | 1 | $65.88 | Add to Cart |
Pump Flange & Shaft Dimensions 277/278 Series
| Item | Part No. | Description | Qty | Notes | Price | |
|---|---|---|---|---|---|---|
| HY252277M1US | 277/278 Series | — | Call for availability | |||
| 500050013 | 4 4 .003 0 .406 2 .060 7 .304 1 .000-15 Spline | — | Call for availability | |||
| 575050013 | 2 | — | Call for availability | |||
| 418837516 | 2 3 .253 0 .344 0 .562 1 .940 6 .410 .875-13 Spline | — | Call for availability | |||
| 371031218 | 4 2 .752 0 .281 N/a N/a 5 .860 .875-13 Spline | — | Call for availability | |||
| 3150M12X1 | .75 4 3 .152 0 .394 0 .55 2 .250 9 .030 1 .420-8 Spline N/a N/a N/a N/a N/a N/a 1 .250 Sae Taper | 0 .3125 | — | Call for availability | ||
| 57504X50013 | 4 4 .003 0 .406 0 .574 2 .056 7 .605 .875-13 Spline | — | Call for availability | |||
| 35524X50013 | 4 4 .003 0 .406 0 .574 2 .060 7 .610 1 .000-15 Spline | — | Call for availability | |||
| TAPPED750DEEP | Shown Are Compiled To Conform To S.a.e Standards; However It Shall Be The . | — | Call for availability |
Additional Parts Listed in This Manual
| Item | Part No. | Description | Qty | Notes | Price | |
|---|---|---|---|---|---|---|
| 329005-1X | / 6X "b" Ratio / "b" Ratio Super Torque | $1,303.35 | Add to Cart | |||
| 329005-2X | / 7X "d" Ratio / "d" Ratio Super Torque | $999.41 | Add to Cart | |||
| 329005-3X | / 8X "g" Ratio / "g" Ratio Super Torque | $1,303.35 | Add to Cart | |||
| 329005-4X | / 9X "m" Ratio / "m" Ratio Super Torque | $1,303.35 | Add to Cart | |||
| 329005-5X | / 10X "s" Ratio / "s" Ratio Super Torque | $1,303.35 | Add to Cart | |||
| 329005-11X | / 12X "b" Ratio / "b" Ratio Super Torque | — | Call for availability | |||
| 329005-13X | / 15X "m" Ratio / "m" Ratio Super Torque | — | Call for availability | |||
| 329005-14X | / 16X "s" Ratio / "s" Ratio Super Torque | — | Call for availability | |||
| 379688 | $8.98 | Add to Cart |
This is the complete factory parts breakdown for the Chelsea PTO 278 — every part in the manual, matched to our live inventory. We stock 160 of the 216 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 278 PTO helps you identify the correct gear sets, shifter kits and service parts for your power take-off before you order.
| Models covered | 278 |
| PTO type | Chelsea 200 Series |
| Document | Illustrated Parts List (Chelsea) |
| Length | 29 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.