REPLACEMENT OF BRASS FITTINGS.
Some of the air line brass fittings on the semitrailer bulk-head and in the auxiliary control box are not currently in the
Army's supply system. If any of these brass fittings have to be replaced, use fittings from the fitting kit (NSN 4730-00-
470-6625) in the organizational maintenance tool set.
Remove protective grease coatings from new parts prior to installation.
Lubricate all preformed packings with a thin coating of light oil of the same type used in the system before
installation. Clean the groove, then stretch preformed packing and place into position. Rotate component on flat
surface, applying downward pressure to press the preformed packing uniformly into position.
To provide added sealing for gaskets, coat both sides with nonhardening oil-resistant sealing compound
(Item 3, Appendix D). Ensure that all traces of previous gasket and sealant are removed before installing new gasket.
Install oil seals with seal lip facing in proper direction, applying even force to the outer edge of seal. Coat oil
seals evenly with oil or grease before installing. If oil seals are to be installed over keyed or splined shafts, use a guide
to prevent sharp edges of the keyway or splines from cutting the lips of the seal. Guides can be constructed of very thin
gage sheet metal and shaped to the required diameter. Ensure that the guide edges are not sharp and are bent slightly
inward so they do not cut the seal.
When installing bearings in a housing, apply force to the outer race or cup to seat the bearing. When
mounting bearings on shafts, always apply force to the inner races.
Lubricate bearings prior to assembly with the type of lubricant normally used in the related housing or
container. This will provide lubrication during the first run-in until lubricant from the system can reach the bearing.
Following assembly and installation, and during operational period, check for leaks. Refer to Appendix G for
all torque values.
ENGINE SAFETY DEVICES REPLACEMENT.
Disconnect and tag wires from tattletale switch, ignition switch, and starter switch at engine instrument
control panel (see Figure 4-5).
Remove fuse (3, Appendix F, Figure 1) from tattletale switch (2).
Remove retaining nut, washer, and tattletale switch (2) from control panel.
Remove knurled nut and ignition switch (1) from control panel.
Remove knurled nut and starter switch (4) from control panel.
Figure 4-5. Engine Safety Devices.