Muncie A20A1006HX31XPX is a medium-duty, 10-bolt clutch-shift PTO for compatible Allison 3000/4000 Series transmissions. It has a 1-1/4-inch round keyed output shaft, HX 12 V electric/hydraulic shift, and a PX standard hose kit. The A10 input gear and ratio-06, 0.63:1 internal gearing identify the speed configuration; arrangement 3 places the output left side and low.
This is a shaft-output PTO for an appropriately sized coupling or driveline to driven equipment. The pump, coupling, driveline, and equipment supports are selected separately. The 1X keyed shaft is not an SAE direct-mount pump flange. Confirm the exact transmission and vehicle clearance before ordering.
A keyed output for a matched auxiliary drive
The 1-1/4-inch shaft uses a 5/16-inch key. Match the driven equipment's required speed, torque and rotation, then select the shaft connection and supports for the installation. The A20 series uses tapered roller bearings and a rotatable shift cover. The HX/PX activation package provides a cab switch assembly and standard pressure hose components; a compatible pump is a separate choice.
| Feature |
Practical benefit |
| Clutch-shift A20 design |
Engages the auxiliary drive through a 12 V electric/hydraulic control circuit. |
| 1-1/4-inch keyed shaft |
Supports a separately selected coupling or driveline for shaft-driven equipment. |
| Arrangement 3 |
Places the output left side and low relative to the PTO opening. |
| HX/PX package |
Provides the 12 V activation components and standard hose kit for this configuration. |
Technical specifications
| Specification |
A20A1006HX31XPX |
| Manufacturer part number |
A20-A1006-HX31XPX |
| Series / mounting |
A20 medium-duty clutch-shift; Allison 10-bolt opening |
| Input gear / internal ratio |
A10 for Allison 3000/4000 Series; ratio 06, 0.63:1 |
| Output speed |
85% of engine speed for the exact listed Allison 3000 application; 122% for listed compatible Allison 4000 applications |
| Output rating |
400 lb-ft continuous and intermittent; 77 hp at 1,000 PTO rpm |
| Shift / arrangement |
HX 12 V electric/hydraulic; arrangement 3 left-side shaft-low |
| Output / 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 lists an Allison 3000 Series 10-bolt application with a 6511-series serial prefix, 85% engine-speed output and a 400 lb-ft rating. The A10 series also includes compatible Allison 4000 applications, with the ratio-06 series speed shown as 122% of engine speed. The specific transmission, PTO opening, chassis clearance and driven-equipment connection must be checked for each vehicle.
| Component or application |
Selection detail |
| Allison 3000 Series |
Exact builder lists serial prefix 6511xxxxxx, 85% engine speed, 400 lb-ft and 77 hp. |
| Allison 4000 Series |
Ratio-06 series speed is 122% of engine speed; verify the exact transmission application. |
| HX/PX installation kit |
Current 48TK6720 kit includes the 30T43806 12 V switch assembly, pressure switch, wiring harness, Allison input cable, standard 28-inch hose kit, studs, gasket and labels. |
| Cab switch and options |
30T43806 contains rocker 30T35687, bracket 36T42362 and faceplate 36T42380. Muncie Start and overspeed control are separate options. |
Before ordering
| Check |
Why it matters |
| Transmission |
Verify the exact model, serial number, 10-bolt opening and Allison PTO drive limits. |
| Drive connection |
Match the keyed shaft and 5/16-inch key to a suitable coupling or driveline; confirm rotation, supports and clearance. |
| Speed and load |
Size the driven system for the applicable 85% or 122% engine-speed relationship and 400 lb-ft PTO rating. |
| Activation and plumbing |
Provide 12 V power, connect the Allison PTO enable circuit while engaged, verify hose routing and place the indicator in the operator's view. |
Need help confirming PTO fit and the shaft connection? Contact UnitedBuilt through online chat, email parts@unitedbuilt.com, or call 602-253-7750 with your transmission model and serial number, driven-equipment requirements, and chassis details.
