TM 9-6115-647-14&P
Section IX. MAINTENANCE OF POWER UNIT TRAILER
4-28.
General. This section of the manual covers maintenance procedures authorized at unit level for
components of the M353 trailer added when the trailer is used as part of the PU-789/M power unit. These
components are not covered in the trailer maintenance manual. For all other unit maintenance procedures on
the trailer, refer to TM 9-2330-247-14&P. When the power unit has been painted in camouflage, replacement
parts must be painted to match authorized patterns and colors as specified in TB 43-0147. Application of
camouflage paint shall be done in accordance with MIL-C-53072.
WARNING
Before performing any maintenance that requires climbing on or under trailer,
chock trailer wheels injury to personnel could result from trailer suddenly rolling.
4-29.
Front Step and Support Replacement. (See figure 4-18 ) The roadside and curbside front steps are
symmetrical Replacement procedures are the same for both.
a.
Removal.
(1) Remove three screws (1, figure 4-18), six flat washers (2) and three nuts (3) attaching front step (4) to
fender (5).
(2) Remove four screws (6), eight flat washers (7) and four nuts (8) attaching front step (4) to trailer
frame (9).
(3) Remove two screws (10), four flat washers (11) and two nuts (12) attaching front step (4) to support
(13) and remove front step.
(4) Remove two screws (14), four flat washers (15) and two nuts (16) attaching support (13) to underside
of trailer frame (9) and remove support.
b.
Installation.
(1) Position support (13) on underside of trailer frame (9) and fasten with two screws (14), four flat
washers (15) and two nuts (16).
(2) Position front step (4) on trailer frame (9) and fender (5).
(3) Fasten front step (4) to trailer frame (9) with four screws (6), eight flat washers (7) and four nuts (8).
(4) Fasten front step (4) to fender (5) with three screws (1), six flat washers (2) and three nuts (3).
(5) Fasten front step (4) to support (13) with two screws (14), four flat washers (15) and two nuts (16).
4-45
