TM 9-2320-272-24-2
NOTE
Coolant should not exceed 195F (90C) or drop below 175F (79C).
Check engine idle speed. If idle speed is not 625 25 rpm on M939/A1 series vehicles, perform steps
14.
15 through 20. If idle speed is not 550-650 rpm on M939A2 series vehicles, perform steps 21
through 25.
Break special seal (2) and remove pipe plug (3) from governor spring pack cover (4). Discard special
15.
seal (2).
Using spring pack adjusting tool, turn adjusting screw (5) in to increase idle speed; out to decrease
16.
idle speed. Correct idle speed is 625 2 25 rpm.
Install pipe plug (3) on spring pack cover (4).
17.
Thread wire of new special seal (2) through pipe plug (3) and two hex-head cover screws (1), and
18.
twist wire of special seal (2) until secure.
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