TRANSMISSION OIL LEVEL (Contd)
Check Oil Level.
Do not check transmission oil level if transmission oil temperature gauge indicates temperature over
220°F (104°C). Stop engine and allow transmission to cool. Hot oil may result in injury to personnel.
Open access door (4) on cab floor in M939/A1 series vehicles or open hood in M939A2 series vehicles
to access dipstick (3). Clean around end of filler tube (5) before removing dipstick (3).
Hot turbocharger and exhaust manifold can cause injury to personnel.
Turn dipstick (3) handle counterclockwise and pull out dipstick (3) on M939/A1 series vehicles. On
M939A2 series vehicles, pull dipstick (3) straight out.
Wipe clean and insert dipstick (3) in filler tube (5).
On M939/A1 series vehicles, withdraw dipstick (3) slowly to prevent a false reading. If transmission oil
temperature gauge (8) on instrument panel reads 180°F (82°C) or below, level on dipstick (3) should show between marks
designated for normal run (2).
On M939A2 series vehicles, slowly pull dipstick (3) out of filler tube (5). Level on dipstick (3) should be
between ADD mark (7) and FULL mark (6).
Overfilling transmission will result in internal transmission damage.
If transmission oil level is low, add oil through filler tube (5) (LO 9-2320-272-12). Return dipstick (3) to
filler tube (5), tighten dipstick handle (M939/A1 series vehicles), and wipe up any oil spilled.