TM 10-3930-664-10 2-22. OPERATION IN DUST OR SANDSTORMS a. Operation. (1) Check the radiator frequently and keep it clean of dust and sand. (2) Check the air cleaner frequently.  Service the filter as often as required. b. At Halt or Parking. (1) Contact Organizational Maintenance to lubricate the 4KRTFL at more frequent intervals.  Clean all fittings and   lubrication   openings   thoroughly   before   lubricating   to   prevent   entrance   of   dust   or   sand   with   the lubricant. (2) When not in use, cover the operator’s compartment, and utilize whatever means are available to protect the engine compartment from the entry of windblown dust or sand. 2-23. FORDING a. Check  the  water  depth,  allowing  for  inconsistency  of  the  bottom.    Do  not  attempt  to  ford  even  the  narrowest stream that is more than 20 inches deep. b. Make certain all gauges are indicating normal operating pressure and temperatures. c. Use the travel and range select lever to shift the transmission into the low speed range (position F1), and speed the engine up to minimize the danger of stalling.  Enter the water slowly to minimize surges of backwash into the engine compartment.  Fording speed should not exceed 3 to 4 miles per hour. d. In the event of complete submersion, contact Organizational Maintenance for appropriate disposition. e. Contact Organizational Maintenance to lubricate the 4KRTFL completely, as soon as possible after fording. 2-24. SLAVE STARTING. The  4KRTFL  is  equipped  with  a  24  volt,  negative  ground  electric  system.    The  slave  receptacle  is  located  on  the transmission cover side panel just behind the ROPS/FOPS on the right side.  Ensure that both vehicles are equipped with a NATO slave receptacle. 2-47