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Allison T2550 fully automatic transmissions
Release time:2024-10-13 Hits： 【Print】
Allison T2550 fully automatic transmissions - Allison 2500 Transmission - Allison Torqmatic series T2500
RATINGS
| Model | Gross Input Torque(2) N*m | Gross Input Power(2) kW (hp) | Gross Input Torque(2)(3) N*m | Gross Input Power(2)(3) kW (hp) | GVW kg | GCW kg |
| 2550 General | 780 | 224 (300) | 895 | 224 (300) | 13,600 | 13,600 |
| 2550 Non-North America School Bus | 705 | 149(200) | 750 | 149(200) | 13,600 | 13,600 |
| 2500 SP Speciality Vehicles | CONTACT YOUR ALLISON REPRESENTATIVE FOR DETAILS | |||||
DRIVETRAIN INTERFACES
- Acceptable full-load engine governed speed: 2200 – 3800* rpm
- Acceptable engine idle speed range (with transmission in drive): 500 – 820 rpm
- Maximum output shaft speed at 105 km/hr (65 mi/hr): 4500 rpm
MOUNTING
- To Engine: SAE No.3, SAE No.2
TORQUE CONVERTER
TYPE: One stage, three element, polyphase. Includes standard integral damper which is operational in lockup.
| Model | Stall Torque Ratio |
|---|---|
| TC-210 | 2.05 |
| TC-211 | 1.91 |
| TC-221 | 1.73 |
| TC-222 | 1.58 |
MECHANICAL RATIOS
(Gear ratios do not include torque converter multiplication)
| First | 3.51 : 1 |
| Second | 1.90 : 1 |
| Third | 1.44 : 1 |
| Fourth | 1.00 : 1 |
| Fifth | 0.74 : 1 |
| Sixth | 0.64 : 1 |
| Reverse | -5.09 : 1 |
CONTROL SYSTEM
| Description | Allison 5th Generation Electronic Controls with closed loop adaptive shifts |
|---|---|
| Shift Sequences | [C = Converter mode (lockup clutch disengaged); l = lockup mode (lockup clutch engaged)]
|
| Driver-to-Transmission Interface | Cab-mounted shift selector |
| Communication Protocol – Engine/Vehicle Systems Interface | SAE J1939, IESCAN, PT-CAN |
PHYSICAL DESCRIPTION
| Installation Length | Dry Weight | Depth below transmission centerline | |
|---|---|---|---|
| SAE No.3 | 729 mm | 150 kg |
|
| SAE No.2 | 73 mm | 150 kg |
|
TURBINE-DRIVEN POWER TAKE-OFF PROVISION
| PTO drive | Torque converter turbine-driven spur gear |
| PTO mounting pads | Six-bolt, 3 o’clock and 9 o’clock positions (as viewed from rear) |
| PTO drive gear rating (continuous operation) |
|
| PTO drive gear ratio | 1.00 x turbine speed |
| PTO drive gear | 64 tooth |
OIL SYSTEM
| Allison approved fluids | TES 295 and TES 389 |
| Capacity, excluding external circuits |
|
| Spin on canister filter | Standard |
SPEEDOMETER PROVISIONS
- Description: Non-zero-crossing square wave 8, 16 or 40 pulses per revolution of transmission output shaft
- location: Electronic output from TCM
TACHOGRAPH PROVISION
- Tonewheel: 6-tooth
- Mounting: M18 x 1.5 metric thread
- location: Transmission rear cover
Allison T2550 fully automatic transmissions - Allison 2500 Transmission - Allison Torqmatic series T2500