TM 9-2320-303-102-31.TOW TRUCK (Con't).(4)When front axle of truck being towed is lifted off the ground, disconnectuniversal joint on propeller lever (at the input to the forward-rear axle) and tie it up to vehicleundercarriage.(5)When rear tandem axles of truck being towed are lifted off ground, ensureinteraxle lockout control valve lever is in UNLOCKED position.b.TowingProcedures.WARNINGBrakes will be released when air is applied to a disabled vehicle. DONOT connect air lines to a disabled vehicle without blocking wheelsand connecting tow bar between vehicles. Failure to follow thiswarning could result in death or injury to personnel and damage toequipment.NOTETowing vehicle speed should not exceed 15 mph on primary roads and8 mph on secondary roads. For cross-country towing, all tires ofdisabled truck should be on ground.(1)Install medium duty tow bar at towing vehicle pintle and disabled trucktowing eyes. Ensure tow bar is long enough to allow complete turning radius.(2)Connect air pressure hoses between disabled truck and towing vehicle.(3)Release parking brakes and turn appropriate lights on.2-32.CAGE AND UNCAGE BRAKES.a.CageBrakes.In the event of an air pressure loss, spring brakes on the tandemrear axles will apply the brakes. If the vehicle must be towed and there is not enough airsystem pressure to compress the power spring in the spring brake chambers to release thebrakes, compress them manually. Each vehicle has four spring brakes.WARNING· Brake chamber contains spring under great pressure. To preventpersonnel injury, never work directly behind chamber. If caging boltwill not engage properly, spring may be broken.· Do not remove clamp ring around spring brake chamber. It is undertension and can cause personnel injury if released.· When spring brakes are applied, vehicle will stop quickly which couldresult in injury to personnel. Also, vehicle cannot be driven againuntil malfunction is repaired and enough air supply is present foroperation of service brakes.2-90
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