The Muncie A20-A1011-HX1BB or A20A1011HX1BB is a medium-duty, 10-bolt clutch shift power takeoff engineered specifically for Allison 3000 and 4000 Series transmissions. The A20 Series design centers on a proven clutch pack with tapered roller bearings for extended service life, an increased-diameter output shaft for added durability, and a shift cover that allows 360-degree rotation for flexible plumbing and installation. A rotatable pump flange and increased housing clearance simplify mounting, while extended-length PTO mounting fasteners and reduced leak paths address common installation pain points. The unit is compatible with the Muncie EX Drive shaft extension and is available in three housing arrangements. Torque ratings span multiple speed ratios; see the ratings table below for intermittent and continuous HP and torque values at 1,000 RPM. Call us to confirm the right configuration for your application.
Features
Clutch shift engagement on a 10-bolt mounting pad for Allison 3000 and 4000 Series transmissions
Shift cover allowing 360-degree rotation for flexible installation
Rotatable pump flange and increased housing clearance for easier mounting
Tapered roller bearings for extended PTO service life
Increased output shaft diameter for higher durability
Compatible with Muncie EX Drive shaft extension; three housing arrangements available
Tech Specs
- Mounting: 10-bolt
- Shift Type: Clutch shift
- Transmission Application: Allison 3000 Series and 4000 Series
- Housing Arrangements: Three
- Shift Cover Rotation: 360 degrees
- Bearings: Tapered roller
- EX Drive Shaft Extension: Compatible
- Torque Rating Type: Single intermittent/continuous rating
Additional Information
| SPEED | 3000 SERIES | 4000 SERIES | INTERMITTENT CONTINUOUS HP (KW) | INTERMITTENT/CONTINOUS |
| RATIO | ENGINE % | ENGINE % | @ 1,000 RPM | TORQUE LBS.FT. (NM) |
| 5 | 74% | 105% | 77 (57) | 400 (542) |
| 6 | 85% | 122% | 77 (57) | 400 (542) |
| 7 | 99% | 141% | 79 (59) | 415 (563) |
| 8 | 114% | 163% | 69 (51) | 360 (488) |
| 9 | 122% | 175% | 65 (48) | 340 (461) |
| 10 | 131% | 187% | 59 (44) | 310 (420) |
| 11 | 151% | 215% | 52 (39) | 275 (373) |
| 12 | 162% | 231% | 50 (37) | 265 (359) |
| 15 | 201% | 287% | 39 (29) | 205 (278) |
