TM 9-2320-209-20-3-1 11-4. JACKING AND SUPPORTING TRUCK CHASSIS. TOOLS: Hydraulic floor jack Wheel chocks (4) Motor vehicle trestle (4) Wood block, 8 x 8 x 24 inches (8) Wood block, 8 x 8 x 42 inches (4) Chock blocks (2) SUPPLIES: None PERSONNEL: One EQUIPMENT CONDITION: Truck parked, engine off, handbrake set. a. Raising Front Chassis. 1. 2. 3. 4. 5. 6. Chock rear wheels. Put hydraulic jack under axle housing (1) as shown. WARNING Keep hands away from front wheels when jacking truck. Wheels may turn as they clear the ground and cause injury to personnel. Using hydraulic jack, jack up truck until front wheels (2) are six inches off the ground. Lay two 42-inch wood blocks (3) under chassis (4) and two 24-inch wood blocks (5) next to each other on top of wood blocks (3). Put trestle (6) on top of four wood blocks as shown. Put two 24-inch wood blocks (5) and trestle (6) on other end of the 42-inch wood blocks (3) under chassis (4) on other side of truck. Using hydraulic jack, lower truck onto two trestles (6). END OF TASK 11-6