TM 9-2320-209-20-3-1 d. Lowering Rear of Chassis (One Side). 1. Put hydraulic jack under crosstube bracket (1) as shown. Jack up truck until weight of truck is off two trestles (2). 2. Take out two trestles (2). 3. Take away eight wood blocks (3). 4. Using hydraulic jack, lower truck onto ground and take away hydraulic jack. 5. Take away wheel chocks (4) from front wheels. END OF TASK 11-9