TM 10-3930-664-10 b. Rear and Right Side View of the 4KRTFL. (1) Tow Bar.  Attaches the 4KRTFL to a towing vehicle.  When lowered, provides access to the radiator cap on top of the engine cover. (2) Engine Cover.  Reduces noise generated from the engine during operation and protects the engine during travel and operation. (3) Engine.  Four cylinder diesel provides power to drive the transmission and gear pump for the steering and hydraulic  systems.    Also  contains  sending  units  for  the  Simplified  Test  Equipment  for  Internal  Combustion  Engines (STE/ICE) diagnostics. (4) Battery Box.  Holds the batteries which provide current for the electrical system. (5) Hydraulic Tank.  Contains hydraulic oil for the steering and hydraulic systems. (6) Oil Sampling Valves.  Drain points for taking samples of engine oil, transmission oil, and hydraulic oil. (7) NATO Slave Receptacle.  Connection point for starting a disabled vehicle or for receiving starting assistance when disabled. 1-5