TM 5-3805-262-20
5-4. INSTRUMENT PANELS MAINTENANCE (CONT)
c. Hourmeter/Tachometer (cont).
REMOVAL (SHEET 2 OF 2)
(2)
(3)
(4)
CLEANING
(1)
(2)
Dry
At male end of cable (l), loosen cable nut using pliers, pull cable end
from tachometer drive, and remove cable (1) from loader.
At tachometer and hourmeter (8), loosen and remove four screws (2),
s p a c e r s ( 4 ), and cover (3).
Loosen and remove two nuts (5), lock washers (6), clamp (7), and tachom-
eter and hourmeter (8).
Clean ends of cable (1) using clean cloth only.
Clean cable (1) jacket, cover (3) , and exterior of tachometer and hour-
meter (8) using clean cloth moistened with detergent. Dry using clean
c l o t h .
cleaning solvent P-D-680 used to clean parts is toxic and flammable.
W e a r p r o t e c t i v e g o g g l e s a n d g l o v e s a n d u s e o n l y i n a w e l l v e n t i l a t ed
a r e a . A v o i d c o n t a c t w i t h s k i n ,
e y e s a n d c l o t h e s a n d d o n ’ t b r e a t he
v a p o r s .
Do not use near open flame or excessive heat and don’t smoke
when using it. Failure to do so could cause serious injury. If you be-
c o m e d i z z y w h i l e u s i n g c l e a n i n g s o l v e n t , g e t f r e s h a i r a n d m e d i c a l
a t t e n t i o n i m m e d i a t e l y.
If contact with skin or clothes is made, flush
with large amounts of water.
I f c o n t a c t w i t h e y e s i s m a d e , w a s h e y es
with water and get medical aid immediately.
(3) Clean all other metallic parts using clean cloth moistened with cleaning
solvent P-D-680. Dry using clean cloths.
INSPECTION
(1)
(2)
(3)
(4)
5-66
Inspect tachometer and hourmeter (8) for cracked or broken case and dam-
aged threads. Inspect face for cracked glass and broken or bent pointer.
If any of the above conditions are seen, or if pointer or hourmeter
mechanism is binding or inoperative, replace tachometer and hourmeter.
Inspect cable (1) jacket for cracks and kinks and cable nuts for cracks
and broken threads. Position cable on flat surface, rotate male end with
fingers, and watch female cable end. If female cable end does not turn,
cable is broken. If cable flops over after initial turning motion, cable
is kinked.
If any of the above conditions are seen, replace cable.
Inspect cover (3) for cracks, scratches, and distortion. Remove shallow
scratches using plastic cleaning compound and clean cloths. Replace cover
if cracked or no longer transparent due to distortion or deep scratches.
Inspect remaining parts for cracks, breaks, d e f o r m a t i o n , d i s t o r t i o n , or
stripped threads; replace as necessary.
