Allison Transmission 1000 & 2000 Product Families 4th Controls MT4007EN Troubleshooting Manual

3–3. UNCOUPLING FROM DRIVELINE, ENGINE, AND VEHICLE WARNING: Chock wheels to prevent vehicle from moving when driveline is disconnected. This is not necessary if vehicle is on a lift or jackstands.

1. Disconnect the vehicle drive shaft from the transmission output flange or yoke. Position the disconnected shaft to avoid interference when removing the transmission.

2. If PTO equipped, disconnect PTO connections such as: a. PTO hydraulic hoses b. PTO­powered equipment drive shaft 3. If transmission mountings support the rear of the engine, place a jack or other support under the engine.

4. Securely support the transmission with a hoist, jack, or other suitable removal equipment.

NOTE: It may be necessary to remove an engine flywheel housing access cover to remove flexplate or flexplate adapter bolts. This is the engine to transmission connection.

5. Remove all bolts, nuts, washers, spacers, and supports that attach the transmission to the vehicle and the engine.

3–4. REMOVING THE TRANSMISSION CAUTION: Do not pull the transmission away from the torque converter assembly. The torque converter drive cover must be entirely free of any restraint by the flexplate drive or crankshaft pilot when the transmission separates from the engine.

WARNING: Be sure the torque converter is moving rearward with the transmission as it is removed. Do not allow the torque converter to become disengaged from the oil pump or to fall completely out of the transmission causing damage and/or personal injury.

1. Move the transmission away from the engine, approximately 34.6 mm (1.36 inch) for a number 2 flywheel housing or 44.2 mm (1.74 inch) for a number 3 flywheel housing, until it is completely clear of the engine. If used, remove the adapter ring and/or gasket.

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