TM 10-3930-669-20 (2) Remove seven screws (6) and cover (7) from heater housing (8). (3) Loosen  fitting  (9)  and  remove  hose  (2)  from heater oil outlet (10). (4) Loosen  fitting  (11)  and  remove  hose  (3)  from heater oil inlet (12). (5) Remove two hoses (2 and 3) and grommet (13) from cab (14). b.  Installation. (1) Position grommet (13) and two hoses (2 and 3) in cab (14). (2) Install   hose   (3)   on   heater   oil   inlet   (12)   and tighten fitting (11). (3) Install  hose  (2)  on  heater  oil  outlet  (10)  and tighten fitting (9). (4) Install   cover   (7)   on   heater   housing   (8)   with seven screws (6). 16-43