C H A P 5, SEC III
I N P U T P R E S S U R E , S C A V E N G E O I L P U M P R E B U I LD
P AR
Section Ill,
I N P U T P R E S S U R E A N D S C A V E N G E O I L P U M P A S S E M B L Y R E B U I LD
7 7 . D E S C R I P T I ON
Refer to par. 10 for description of the in-
put pressure and scavenge oil pump assembly.
7 8 . D I S A S S E M B L Y ( f i g . 3 7 3 , f o l d - o u t 2)
a . U s i n g a 9 / 1 6 - i n c h w r e n c h , r e m o v e
four self-locking bolts 52 from pump assem-
bly 45.
b . R e m o v e s c a v e n g e o i l p u m p b o d y 4 7,
gears 55 and 56 and Woodruff key 51.
c . D o n o t r e m o v e t h e t w o n e e d l e b e a r-
ings 53 and 54 from scavenge pump body 47
u n l e s s r e p l a c e m e n t i s n e c e s s a r y.
R e m o v e
bearings with an expanding slide hammer re-
m o v e r t o o l . I f s u c h a t o o l i s n o t a v a i l a b l e,
the bearings will have to be cut out with a
burr gun.
d . Remove pump separator plate assem-
bly 48.
e . Remove pressure pump drive gear 57
and idler gear 58 from pump body 61.
f. Do not remove the two needle bearings
5 9 a n d 6 0 f r o m t h e p r e s s u r e p u m p b o d y 61
u n l e s s r e p l a c e m e n t i s n e c e s s a r y.
R e m o v e
bearings with an expanding slide hammer re-
m o v e r t o o l . R e f e r t o c , a b o v e.
g . Do not remove the two dowel pins 49
from the pump separator plate 50 unless re-
p l a c e m e n t i s n e c e s s a r y . I f n e c e s s a r y , r e-
move the dowels.
7 9 . C L E A N I N G
Refer to par. 71 for cleaning recommen-
dations.
8 0 . I N S P E C T I O N A N D R E P A I R
R e f e r t o p a r . 7 2 f o r g e n e r a l i n s p e c t i on
7 7 - 8
and repair recommendations. Repair and re-
b u i l d p o i n t s o f m e a s u r e m e n t f o r f i t s , c l e a r-
ances and wear limits are indicated by small,
l o w e r c a s e l e t t e r s i n f i g , 3 7 3 , f o l d - o u t 2.
Refer to par. 236 for wear limits information.
8 1 . A S S E M B L Y ( f i g . 3 7 3 , f o l d - o u t 2)
a . If the two dowel pins 49 were removed
frompump separator plate 50, press in new
pins, leaving one end of each within 0.420 inch
of the plate surface.
b . If the two needle bearings 59 and 60
w e r e r e m o v e d f r o m p r e s s u r e p u m p b o d y 6 1,
install new replacements. Press the bearing,
against the numbered side of the bearing cage,
0.060 to 0.100 inch below the surface adjacent
to the bearing bore.
c . If the two needle bearings 53 and 54
w e r e r e m o v e d f r o m s c a v e n g e p u m p b o d y 4 7,
install new replacements. Press the bearing,
against the numbered side of the bearing cage
and from the inside of the body, 0.010 to 0.040
inch below the surface adjacent to the bearing
b o r e.
d . Install input pressure pump drive gear
57 and idler gear 58 into input pressure pump
body 61.
e . I n s t a l l p u m p s e p a r a t o r p l a t e a s s e m-
bly 48.
f. Install Woodruff key 51 onto input pres-
sure pump drive gear 57.
g . Install scavenge pump gears 55 and 56
onto input pump drive gear 57 and idler gear 58.
h . Install scavenge pump body assembly
47 and secure with four 3/8-16 x 2-1/4 self-
l o c k i n g b o l t s 5 2.
T o r q u e t h e b o l t s t o 3 6 - 43
pound-feet. After assembly, the pump should
r o t a t e f r e e l y .
1 0 4
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