Mack CHM 2010 Operator'S Handbook Manual Download

Page: 154 / 232

146 OPERATION

MACK T310M, T310ME and T310MLR Shifting
Instructions

CAUTION

Make sure air pressure is at least 620 kPa (90 psi) and unit is at operating temperature
before making range shifts. Always start in LO range. This also applies to dynamometer
testing. When the truck is stationary, do NOT shift into HI range and then start moving
the truck. Otherwise, damage to the synchronizer may result.

The T310M is a range-shifted transmission which has 10 forward speeds. There is a LO
and HI auxiliary compound section controlled by an air-shift selector on the shifter. This
compound section is equipped with a synchronizer to facilitate LO-HI range shifting. The
T310M transmission also provides a multi-speed reverse feature by means of reverse gearing
in the compound case which works in conjunction with LO-LO, first and second speed gears
in the main box. The air-shift selector must be moved to the R (REVERSE) position in order
to utilize the multi-speed reverse feature.

LO range provides six low ratios for six forward gears in the T310M. HI range provides
four additional forward gears which can be shifted in the standard manner. Remember,
however, to double-clutch when moving up or down through the gears. For normal highway
use, start in LO range, first gear and shift through second, third and fourth. The LO-LO and
LO positions in LO range for this transmission are designed for use in off-highway and
slow-moving operations such as curb pouring, material spreading, heavy load/steep grade.
REVERSE is used in LO range for four reverse speeds.

Upshift —

Begin in first gear (shown as 1/5 on shift pattern diagram) with air-shift selector

in LO range. Upshift to second gear (2/6 on shift pattern diagram) LO range in the normal
manner (double-clutching). When ready to upshift again, depress the clutch pedal and
release the accelerator pedal in the normal manner. Repeat this shifting pattern through the
remaining gears up to fourth speed (4/8 on shift pattern diagram). When maximum engine
RPM has been reached in fourth gear, flip the air-shift selector to HI range (preselect),
then double-clutch and shift to fifth gear. As the shift lever passes through NEUTRAL, it
will put the transmission in HI range. Continue to upshift through normal sixth, seventh
and eighth gears, while double-clutching.

Downshift —

Downshift as normal from eighth to seventh, sixth and fifth in HI range

(double-clutching between all gears). The next lower shift will be to fourth gear LO range.
While still in fifth gear, flip the air-shift selector to LO range (preselect), then double-clutch
and move the shift lever through NEUTRAL to fourth gear. The move through NEUTRAL
activates the air-shift mechanism, this time to LO range. The next lower gear is third gear
LO range. Double-clutch down through the remaining gears to first gear LO range as needed.

Mack CHM 2010, Operator'S Handbook Manual

Search results

Summary of Contents for CHM 2010

Reviews:

Related manuals for CHM 2010

Brands by name

Popular brands