TM 9-2320-209-20-3-1 b. Lowering Front Chassis. 1. Put hydraulic jack under axle housing (1) as shown. 2. Jack up truck until truck is off two trestles (2). 3. Take out two trestles (2) and six wood blocks. 4. Using hydraulic jack, lower truck onto ground and take away hydraulic jack. 5. Take away wheel chocks (3) from rear wheels. END OF TASK 11-7