Table 1-1. Specifications and Data

TM 9-2520-249-34&P

Table 1-1. Specifications and Data

Manufacturer ...................................................................................................................................... Detroit Diesel Allison Division, GM

Model.................................................................................................................................................. XTG 250-1A

Assembly number............................................................................................................................... 8356100

Type . ................................................................................................................................................. X drive

Weight, dry......................................................................................................................................... 1310 Ib

Overall dimensions:

Length (engine mounting face to rear) ....................................................................................... 30.65 in

Width. ........................................................................................................................................ 46.00 in

Height (excluding oil filler tube)........................................................................................................... 29.32 in

Nameplate location . ........................................................................................................................... Front-top of converter housing

Rating:

Max input torque......................................................................................................................... 542 lb/ft

Max input speed......................................................................................................................... 2800 rpm

Max input power ......................................................................................................................... 248 hp

Rotation:

Input (viewing front of transmission) .......................................................................................... Clockwise

Outputs (forward operation, viewing right side. .......................................................................... Clockwise

Drive ranges (manually selected) ....................................................................................................... R1, R2, N, 1, 2, 3, 4

Torque converter:

Type ........................................................................................................................................... Single stage, multiphase, w/lockup clutch

Max torque multiplication ratio (at stall)............................................................................................... 2.6:1

Lockup clutch ..................................................................................................................................... Single disk, automatic hydraulic apply

Range, output, steer clutches............................................................................................................. Wet, multidisk, hydraulic apply

Brakes (service, parking).................................................................................................................... Wet, multidisk, mechanical apply

Gearing:

Range and steering (constant mesh). ........................................................................................ Planetary

Cross shaft. ............................................................................................................................... Spiral bevel

Output reduction. ....................................................................................................................... Straight spur

Mounting:

Input drive (engine to transmission) ........................................................................................... Flex plate

Front support.............................................................................................................................. Converter housing bolted to engine

Rear support. ............................................................................................................................. Trunnions at left, right outputs

Oil system:

Input-driven pump (main pressure). ........................................................................................... 2-gear type

Output-driven pump (main pressure) ......................................................................................... 3-gear type

Brake coolant pump ................................................................................................................... Dual-section, 2-gear type

Oil specification:

MIL-L-21260, Grade 1, engine oil............................................................................................... Use during break-in and preservation

MIL-L-2104, Grade 10, engine oil............................................................................................... Use when ambient temp is above 0o F

MIL-L-10295, engine oil ............................................................................................................. Use when ambient temp is below 0o F

Oil capacity (less cooler circuit).......................................................................................................... 14 US gal

Oil filter ............................................................................................................................................... Full flow, screen type (80x80 mesh), cleanable

Oil temperature:

Normal (in sump). ...................................................................................................................... 180 to 220 F

Maximum (to cooler)................................................................................................................... 3250 F

Gear ratios (mechanical):

Low-range planetary .................................................................................................................. 4.182:1

Intermediate-range planetary (compounded

with low-range planetary). ...................................................................................................... 2.246:1

High range (clutch) . .................................................................................................................. 1.00:1

Reverse-range planetary. ........................................................................................................... 2.094:1

Steer planetary. .......................................................................................................................... 1.478:1

Bevel gear .................................................................................................................................. 1.444:1

Output reduction gears .............................................................................................................. 2.222:1

Speedometer drive ratio . ........................................................................................................... 3.072 X transmission output

Torque multiplication ratios (overall):

First gear, stall (2.6 X 4.182 X 1.478

X 1.444 X 2.222).................................................................................................................... 51.563:1

Fourth gear, lockup (1.00 X 1.444

X 2.222) ................................................................................................................................. 3.209:1

Reverse-i, stall (2.6 X 4.182 X 1.444

X 2.094 X 2.222) ................................................................................................................................ 73.055:1

Reverse-2, lockup (1.00 X 2.246 X 1.444

X 2.094 X 2.222).................................................................................................................... 15.090:1

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