DIRECT SUPPORT AND GENERAL SUPPORT
Section I. INTRODUCTION
5-1. General. This chapter contains direct support and general support level maintenance procedures for
components of the M353 trailer and MEP-1 14A generator set added when they are used as part of the PU-
789/M power unit. These components are not covered in the overall trailer or generator set maintenance
manuals. For all other direct and general support maintenance procedures on the trailer, refer to TM 9-2330-
247-14&P. For direct and general support maintenance procedures on the generator set, refer to TM 5-6115-
Before performing any maintenance that requires climbing on or under trailer, set
trailer hand brakes injury to personnel could result from trailer suddenly rolling.
Section II. GENERATOR SET
5-2. Generator Set Replacement. (See figure 5-1.)
(1) Unplug P3 power/control cable (1, figure 5-1) and P4, P7 low fuel cable (2) from adapter plate
(2) Turn fuel selector valve (4) to OFF. Disconnect fuel line (5) from generator set (6) by unscrewing
adapter (7) from generator set.
(3) Open generator set side panels.
(4) Disconnect four J3 harness wires (8) from generator set load terminals inside curbside front side panel.
(5) Disconnect P12, J11 wiring harness (9) from connectors P41 and J41 on generator set (6) and from
terminal board TB2 on adapter plate assembly (3) . Pull wiring harness out through top. Reconnect
(6) Disconnect generator set ground wire (9 1) from generator skid ground. Disconnect ground wire (9 2)
from adapter plate assembly GROUND.
(7) Remove six screws (10) and six lockwashers (11) and remove adapter plate assembly (3) from
generator set (6).
(8) Remove four screws (12) and four lockwashers (13) and remove sleeve plate assembly (14) and
spacers (15) from generator set (6). Retain screws, lockwashers and spacers for installation on
replacement generator set. Using hardware stored in generator set storage compartment, install sleeve
plate assembly on generator set at location from which adapter plate assembly was removed in step