TM 9-2350-256-20-1
UNIT MAINTENANCE
RECOVERY VEHICLE, FULL TRACKED: MEDIUM, M88A1
NSN 2350-00-122-6826, EIC AQA
M239 SMOKE GRENADE LAUNCHER SYSTEM THEORY OF OPERATION
M239 Smoke Grenade Launcher System
The M239 smoke grenade launcher system consists of two smoke grenade dischargers (1), canvas covers, a push button firing
switch at the commander's station, two smoke grenade stowage boxes, and an electrical installation kit composed of a power
(arming) switch box, mounting bracket, electrical wiring harnesses, and connectors.
The power (arming) switch box is mounted on a bracket attached to the cab top near the commander's cupola. Electrical wiring
harnesses connect the power switch box to the push button firing switch, dischargers, and vehicle current source. The power
switch box consists of an on/off switch to control the power supply to the firing switch, and an indicator lamp to show the
presence of electrical power.
Figure 1. M239 Smoke Grenade Launcher System.
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