Description
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:Â SAE No.3, SAE No.2
TORQUE CONVERTER
TYPE:Â 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:Â 6-tooth
- Mounting:Â Â M18 x 1.5 metric thread
- location: Transmission rear cover