PS Magazine - TB 43-PS-693
PS, The Preventative Maintenance Monthly
ISSUE 693
AUGUST 2010
13
PS 693
12
AUG 10
HEMTT -A4 operators
should inspect the radiator
fan motor’s hydraulic
drain hose for the
installation position and
for wear right away. The
hose, NSN 4720-01-562-
9248, is shown as Item 43
in Fig 381 of EM 0288,
the IETM for the HEMTT
-A4, and in the hydraulic
schematic as line 2980.
EM 0288 will be updated
with the hose NSN at the
next change. A ±eld-level
mechanic can replace or
properly route the hose.
The hose is behind the engine. It crosses over the transmission leading from the
radiator fan motor to a T-±tting at the hydraulic reservoir. The hydraulic distribution
manifold is located on a bracket above the transmission. The hose should be
positioned
above
the hydraulic distribution manifold.
Routing
Hose
Wrong
Means
T
r
o
u
b
l
e
!
HEMTT -A4s…
ma 10-015 says that on
some hemtt -a4 trucks, the
hydraulic drain hose from
the radiator fan motor
may be routed incorrectly,
causing the hose to wear
and eventually leak.
and this isn’t the
same as the hose
issue covered in
tacom soum 10-
003 that we told
you about in ps
691 (jun 10).
does your
unit have
-a4 model
hemtts?
have you found leaks
in the radiator fan
motor’s hydraulic
drain hose?
then you
should
eyeball
this…
Routing
Hose
Wrong
Means
T
r
o
ub
le
!
Ensure hose shown in line 2980 of hydraulic schematic is correctly routed
Hydraulic line 2980
…tacom
maintenance
advisory (ma)
message
10-015!
Engine and
transmission
not shown.
693.12-13.indd
1-2
7/9/10
11:41:33 AM
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