TM 5-5420-234-14&P
4-12. UNIT TROUBLESHOOTING (continued).
7.
HOURMETER DOES NOT OPERATE (MODEL A ONLY) (continued).
UPPER
BODY
CONTINUITY TEST
(1) Remove four screws and lockwashers
from cab control box.
(2) Remove six screws from cab control
box, and separate upper body from
base.
(3) Turn engine start switch to ON
position.
(4) Turn LHS MODE SELECT SWITCH to
AUTO or one of the manual positions.
(5) Inspect whether LED D59 is on or off.
BASE
LED D59
4-131
Change 1
