200 OPERATION
MACK TM309 Shifting Instructions
CAUTION
Make sure air pressure is at least 90 psi and unit is warmed before shifting the
transmission. To avoid transmission damage, do NOT change range while moving
in REVERSE. Use of the clutch brake is for shifting into first and reverse gears
only. Do not use the clutch brake to shift out of gear. Be careful not to overspeed
the engine during downshifting. Damage to powertrain components can result.
The TM309 is a non-synchronized transmission having a total of nine speeds
(6+3) with an air shifted non-synchronized compound section. This LO and HI
auxiliary compound section is controlled by an air-shift range selector valve
located on the shift lever. The LO range has three low gear ratios. In HI range
there are six forward gears which can be shifted in the normal manner, but
remember to double-clutch whether moving up or down through the gears.
For normal highway use, start in HI range, first gear and shift through second,
third, fourth, fifth and sixth. The ratio step between fifth and sixth is smaller
than all the other ratio steps. The three gears in LO range are designed
for off-highway use and in slow-moving operations (curb pouring, material
spreading, heavy load, steep grade). Only start in the lowest gear necessary
to move the vehicle. The extreme LO gear (1st low) is intended for vehicular
speed control and not for torque multiplication.
Reverse —
Reverse can be used in LO or HI range. To make a range shift
in reverse, bring the truck to a complete stop. Flip the range selector lever
to range desired (preselect). Move the shift lever out of reverse through
NEUTRAL and then back into reverse again. As the lever moves through
NEUTRAL, the range shift will be completed.
Summary of Contents for Granite GU Series
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Page 44: ...SAFETY INFORMATION 33 Advisory Label Locations On Vehicle Labels Found on Chassis C0029831 ...
Page 45: ...34 SAFETY INFORMATION C0028958 ...
Page 46: ...SAFETY INFORMATION 35 C0028959 ...
Page 47: ...36 SAFETY INFORMATION C0029013 1 Right Side Frame Rail 2 Hood Prop ...
Page 48: ...SAFETY INFORMATION 37 C0029014 ...
Page 49: ...38 SAFETY INFORMATION Labels Found on Driver Side Sun Visor C0029832 ...
Page 50: ...SAFETY INFORMATION 39 C0029016 ...
Page 58: ...SAFETY INFORMATION 47 C0029833 ...
Page 60: ...SAFETY INFORMATION 49 C0029834 ...
Page 62: ...SAFETY INFORMATION 51 C0029835 ...
Page 72: ...INSTRUMENTS AND CONTROLS 61 Panel B W3056238 ...
Page 81: ...70 INSTRUMENTS AND CONTROLS C0029141 ...
Page 82: ...INSTRUMENTS AND CONTROLS 71 Diagnostics W3036575 W3036576 W3036583 ...
Page 84: ...INSTRUMENTS AND CONTROLS 73 C0029144 ...
Page 113: ...102 INSTRUMENTS AND CONTROLS C0029240 C0029241 ...
Page 235: ...224 OPERATION C0029351 ...
Page 241: ...230 OPERATION C0029352 ...
Page 284: ...MAINTENANCE AND LUBRICATION 273 C0029851 C0029852 1 Towhook Access ...
Page 305: ...294 MAINTENANCE AND LUBRICATION C0029434 1 Front 2 Back ...
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