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object must be performed. The special services are as follows:
Make all necessary adjustments in accord-
(1) A d j u s t .
ance with the pertinent section of this manual, tech-
nical
bulletins,
or
other
current
directives.
(2) C l e a n .
Clean the unit as outlined in paragraph 42
to remove old lubricant, dirt, and other foreign ma-
terial.
This applies either to lubrication
(3) S p e c i a l l u b r i c a t i o n .
operations  that  do  not  appear  on  the  semitrailer  lubri-
cation
order
or
to
items
that
do
appear
but
which
should be performed in connection with the mainte-
nance operations, if parts have to be disassembled
for  inspection  or  service.
(4) S e r v e .
This
usually
consists
of
performing
special
operations, such as draining and refilling units with
oil,  and  changing  or  cleaning  the  air  filter.
(5) T i g h t e n .
All tightening operations should be per-
formed
with
sufficient
wrench
(force
on
the
wrench handle) to tighten the unit according to good
mechanical practice.
Use  a  torque-indicating  wrench
where specified. Do not overtighten, as this may strip
Tightening  will  always
threads  or  cause  distortion.
be  understood  to  include  the  correct  installation  of
lockwasher, locknuts, locking wire, or cotter pins pro-
vided to secure the tightened nut.
When
conditions
make
it
difficult
to
d.
Special Conditions.
perform  the  complete  preventive-maintenance  procedures  at  one
time, they can sometimes be handled in sections, planning to
complete all operations within the week if possible. All avail-
able time at halts and in bivouac areas must be utilized, if
necessary, to insure that maintenance operations are completed.
When limited by the tactical situation, items with special serv-
ices in the columns should be given first consideration.
e. DA Form 461. The
numbers
of
the
preventive-maintenance
procedures that follow are identical with those outlined in DA
Certain items on the form that do not apply to
Form  461.
this vehicle are not included in the procedures in this manual.
In general, the sequence of items on the form will be followed,
but in some instances there is deviation for conservation of
the mechanic's time and effort.
f. Procedures.
Table III lists the services to be performed
by the organizational mechanic or maintenance crew at the des-
Each page of the table has two columns
ignated  intervals.
at its left edge corresponding to the scheduled C and D serv-
TAGO 1321B
70



 


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