Muncie A20A1010HX31XPX is a medium-duty, 10-bolt clutch-shift power take-off for compatible Allison 3000/4000 Series transmissions. This 12 V electric/hydraulic, left-side shaft-low configuration has a 1-1/4-inch round keyed output shaft and standard hose kit. Match the transmission opening, control circuit, shaft connection, and driven equipment before selecting the PTO.
Its A20 clutch engages an auxiliary drive on command. The keyed shaft supports a separately selected coupling or driveline. A pump, coupling, and driveline are selected separately. This 1X output is a keyed shaft, rather than a direct-mount SAE pump flange.
Configured for a shaft-driven auxiliary system
The HX/PX installation package includes a cab-mounted rocker switch and connections for the Allison PTO enable input. Muncie's tapered roller bearings and rotatable shift cover are A20 design features. The output arrangement places the shaft on the left side and low relative to the PTO opening, so check chassis clearance and hose routing.
| Feature |
Practical benefit |
| Clutch-shift A20 design |
Engages the auxiliary drive through the specified 12 V electric/hydraulic controls. |
| 1-1/4-inch keyed output |
Supports a shaft connection through a correctly selected coupling or driveline. |
| Arrangement 3 |
Positions the output left side, shaft low. |
| HX/PX package |
Includes activation components and the standard hose kit for this build. |
Technical specifications
| Specification |
A20A1010HX31XPX |
| Manufacturer part number |
A20-A1010-HX31XPX |
| Mounting and input gear |
Allison 10-bolt opening; A10 gear option for 3000/4000 Series |
| Ratio |
10 gear selection; 0.97:1 internal ratio |
| Output speed |
131% of engine speed for the listed Allison 3000 application; 187% for the listed 4000 application |
| Output rating |
310 lb-ft continuous and intermittent; 59 hp at 1,000 PTO rpm |
| Shift and arrangement |
HX 12 V electric/hydraulic; 3 left-side shaft-low |
| Output and hose option |
1X 1-1/4-inch round shaft with 5/16-inch key; PX standard hose kit |
Applications and included components
Muncie's exact builder identifies an Allison 3000 Series transmission with a 6510-series serial prefix. The A10 series literature also identifies compatible Allison 4000 applications, with a different output-speed percentage. Confirm the transmission model and serial number against the complete vehicle application before ordering.
| Component or application |
Selection detail |
| Allison 3000 Series |
Exact build lists serial prefix 6510xxxxxx and 131% of engine speed. |
| Allison 4000 Series |
A10 series application lists 187% of engine speed; verify the specific transmission. |
| HX/PX installation kit |
Current kit 48TK6720 includes 30T43806 12 V switch kit, pressure switch, wiring harness, Allison input cable, standard 28-inch hose kit, studs, gasket, and safety labels. Older blue-cover units use kit 48TK6583. |
| Rocker switch |
30T43806 contains rocker 30T35687, bracket 36T42362, and faceplate 36T42380. Overspeed control is an optional separate selection. |
Before ordering
| Check |
Why it matters |
| Transmission |
Confirm model, serial number, PTO opening, and application. |
| Drive connection |
Confirm the 1-1/4-inch keyed shaft, 5/16-inch key, suitable coupling or driveline, clearance, and driven-equipment rotation. |
| Speed and load |
Size the system for the applicable 3000 or 4000 output speed, 310 lb-ft PTO rating, and transmission drive limits. |
| Activation and plumbing |
Provide 12 V power, connect the Allison PTO enable circuit, verify hose routing, and position the engagement indicator where the operator can see it. |
Need help confirming PTO fit and the drive connection? Contact UnitedBuilt through online chat, email parts@unitedbuilt.com, or call 602-253-7750 with your transmission model and serial number, chassis details, and driven equipment.
