TM   10-4320-226-14 Table 4-1. Preventive Maintenance Checks and Services for the 350 GPM Pumping Assembly. (continued) Not Fully Mission Capable If: Item No. 4 5 6 7 8 9 10 11 12 13 14 Interval Quarterly Quarterly Quarterly Quarterly Quarterly Quarterly Quarterly Quarterly WHEELS Quarterly Annually Annually Item  to be   Inspected AIR   CLEANER BATTERIES Check  to  ensure  battery  is  charged. V-BELT Inspect V-belt for tightness. Make sure belt is not  cracked,  broken,  stretched,  or  damaged. V-BELT    CONTACT Test switch to ensure it works properly. SWITCH (Paragraph   4.10.9) ENGINE    VALVE Check   engine   valve   clearance. CLEARANCE (Paragraph    4.10.23) CRANKCASE, BLOCKS    AND CYLINDER HEAD Inspect for cracks, or other damage. Clean block  and  cylinder  head  cooling  fins. TIRES Check  for  proper  inflation,  40  psi  (275.9  kPa). Measure  tread  depth  using  tread  gauge  at three  equally  spaced  points  on  tire  (should  be more  than  1/8  in,);  inspect  tires  for  cuts, cracks,  or  uneven  wear. Check  wheels  and  bearings  for  damage. Service  bearings  in  accordance  with LO    5-4320-226-12. AXLE SHUTDOWN SOLENOID Visually  inspect  all  structural  parts  for excessive   wear,   corrosion,   broken   welds, cracks,  and  security. Test  solenoid  to  ensure  it  works  properly. (Paragraph    4.10.14) ENGINE    START Replace   engine   start   cartride(ether   can). CARTRIDE (Paragraph    4.10.3.1) Procedure Inspect  for  cracked,  or  damaged  air  cleaner. Check  condition  of  fitter  housing. (Paragraph   4.10.5) Air cleaner is damaged   or missing. Battery  does  not maintain  charge. V-belt can not be adjusted  to  proper tension. r/-belt  switch defective. Engine  valve clearance  can  not be  met. Crankcase, blocks,   and cylinder  heads  are not   serviceable. Tires  are  not serviceable. Wheels  are  not serviceable. Shutdown solenoid  is defective. 4-6   Change   2