TB-9-2300-378-14 Technical Bulletin for Air Induction System M48 M60 Download
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TB 9-2300-378-14 b. Pressure Switch and Air Hoses Replacement (Fig. 6-19). NOTE Replacement procedures are the same for pressure switch and air hoses on left and right sides. (1) Removal (a) Open top deck grille doors to expose turbosupercharger and pressure switch (view A). (b) Disconnect high and low air pressure hoses from pressure switch and from turbosupercharger compressor housing filter. Remove hoses. (c) Remove screw and lockwasher securing pressure switch mounting bracket to turbosupercharger mounting support. Remove pressure switch and mounting bracket. (d) Remove screw and lock-washer securing harness assembly ground lead to pressure switch mounting bracket. (e) Disconnect harness assembly connector from pressure switch (view B). (f) Remove adapters and packings from inlet and outlet (HIGH and LOW) ports of pressure switch. Discard packings. (g) Remove two remaining screws and lock washers securing pressure switch to mounting bracket. Separate pressure switch from mounting bracket. (2) Installation (a) Put replacement pressure switch on mounting bracket and secure with two bottom screws and lock washers (Top screw and lock washer will be put in when ground lead is installed later). (b) Install adapters and new packings in inlet and outlet (HIGH and LOW) ports of replacement pressure switch. (c) Connect harness assembly connector to electrical connector on pressure switch. (d) Install harness assembly ground lead on pressure switch mounting bracket with screw and lockwasher. (e) Position assembled pressure switch and mounting bracket on turbo- supercharger mounting support and secure with screw and lockwasher. NOTE Long air pressure hoses go on engine right bank pressure switch, short air pressure hoses go on engine left bank pressure switch. (f) Install air pressure hoses on adapters in pressure switch and turbo- supercharger compressor filter housing. (g) Perform dust detector operational test (para. 6-17j). (h) Close top deck grille doors. c. Engine Wiring Harness Replacement (Fig. 6-20). (1) Removal (a) Disconnect three battery ground cable assemblies from battery terminals. (b) Remove top deck transmission shroud and engine shroud (TM 20-1). (c) Remove screw and lockwasher securing wiring harness ground lead to right and left bank pressure switch mounting brackets (view A). Disconnect ground lead. 6-51