TM   5-4930-227-14 Mdfunctkm 8.  Pump  fails  to  deliver  capacity 9.  Pump  fails  to  pump  product 10.   Pump   noisy 11.  Hose  reel  does  not  turn  ea.+ily 12.   Product  discharge  is  not  ckan 13.   Flow  of  product  slows  down during  operation 14.  No  product  appears  in  sight  glass T a b l e     3 - 2 - C o n t i n u e d . Pwbable   cause ;; :. a. b. c. d. a. b. c. a. b. a. b. c. Engine  speed  too  low Air  lock  in  pumping  system Kinked  lines Clogged  impeller Pump  not  properly   primed Engine  speed  tQO  low Discharge  hose  kinked  or  defective Filter/separator  clogged Foreign  matter  in  pump Impeller  worn  or  out  of  alinement Vibrating  on  base Improper   lubrication Misalined Contaminated  elements Canister  loose Shell  dirty  on  inside Leak  in  hose  or  connections a.  Upper  and  lower  valves  closed b.   Air   in   sight   glass Chtiive   action a. b. c. d. a. b. c. d. a,. b. c. a. b. a. b. c. Adjust  carburetor   ( p a r a    3 - 2 8 ) . Cool  pump  and  reprime    ( p a r a     2 - 9 ) . Check  lines. Check  impeller. Prime  pump    ( p a r a     2 - 9 ) . Adjust  carburetor    ( p a r a     3 - 2 8 ) ; adjust  governor   ( p a r a    3 - 2 8 ). Remove  kink  or  replace  hc+se        ( p a ra 3 - 3 5 ) . Check  and  clean  filter/aeparabr ( f i g .      3 - 3 ) . Clean  pump    ( p a r a     3 - 1 7 ) . Replace  impeller   ( p a r a    3 - 1 7 ). Check  tiedown  gear. Lubricate  fittings  in  accordance With   L O    5 - 4 9 3 0 - 2 2 7 - 1 2 . Check  alinement. Replace  elements    ( p a r a     3 - 9 ) . Tighten  canister    ( p a r a     3 - 9 ). Clean  shell. Tighten  connections  or  replace  hose ( p a r a     3 - 3 5 ) . a.  Open  valves    ( p a r a     2 - 7 ) . b.  Open  petcock  to  release  air    (  p  a  r a 2-9)  . Section VI. FIELD EXPEDIENT REPAIRS 3-12.  General 3-13. Engine Lacks Power Maintenance trouble may occur while the tank Trouble Expedient   Remedy and pump unit is operating where repair parts Air  cleaner  clogged  or Remove  air  cleaner    ( p a r a are not available and normal corrective action can- defective 3 - 2 7 )    and  operate  with- not be performed. When this condition exists, the out  it.  Cover  opening following  expedient  repairs  may  be  used  in with  a  clean  rag. emergencies,  upon  the  decision  of  the  unit  Com- mander.  Equipment  so  repaired  must  be  removed 3-14. Engine Fails to Get Fuel from operation as soon as possible and properly Fuel  line  broken  ________Use  industrial  tape  and  tape repaired  before  being  placed  in  operation  again. line at break. Section VIl. PUMP AND ENGINE 3-15.  General The  pump  and  engine  unit  is  mounted  on  an aluminum frame which will slide out from the pumping  assembly.  This  mounting  arrangement provides  easy  access  to  the  pump  and  engine  for maintenance  and  servicing  purposes. 3-16. Pump and Engine Unit a.  Removal.  Refer  to  figure  3-4  and  remove pump  and  engine  unit. b. Installation. Refer to figure 3-4 and install pump  and  engine  unit. 3-17. Pump and Intermediate Coupling a.  Removal. (1)   Remove   the   pump   and   engine   unit (para 3-16). (2)  Refer  to  figure  3-5  and  remove  the pump  and  intermediate  coupling. Note. Intermediate coupling cannot be removed un- til  after  the  pump  impeller  has  been  removed  from  the shaft. b.   Disassembly. semble  the  pump Refer to figure 3-6 and disas- and  intermediate  coupling. 3-7