Table   2-12. Item No. 1 2 3 4 Interval Before Preventive   Maintenance   Checks   and   Services   for   Pumping   Assembly Model US636HCCD-1. Location Item  to Not   Fully   Mission Check/Service Procedure Capable   if: EXTERIOR Leaks Inspect   ground   under   engine Any   evidence   of Before Before Before f o r - e v i d e n c e    o f    l e a k s .    If leaks. leaks   are   present,   notify   unit maintenance. TRAILER   CHASSIS Park  Brake  Lever Tongue  Jack Rear   Jacks Check   that   park   brake   lever will   lock   and   unlock   tailer wheels. Check   for   proper adjustment. Adjust   as required. Check   tongue   jack   supports, welds,   and   tongue   jack   for damage. If   damaged,   notify unit   maintenance. Check   that tongue   jack   is   secured   and operable. If   not   operable, notify   unit   maintenance. Check   rear   jacks   for   damage. Check   that   they   are   secured and   operable. If   damaged,   not secure,    or   not   operable, notify   unit   maintenance. Park   brake   lever will   not   lock   or u n l o c k    t r a i l er wheels. Tongue   jack   is damaged,   not secured,   or   not operable. Rear   jack   is damaged,   not secure,   or   not operable. 2-65 TM  10-4320-344-10