Auxiliary Transmissions
The auxiliary transmission is used to provide additional gear ratios in the power train (Figure 10-13). This transmission is installed behind the main transmission, and power flows directly to it…
Transmission Types
Modern manual transmissions are divided into two major categories: • Constant mesh • Synchromesh Constant Mesh Transmission The constant mesh transmission has two parallel shafts where all forward gears of…
Shift Forks, Shift Linkage and Levers
Shift Forks Shift forks fit around the synchronizer sleeves to transfer movement to the sleeves from the shift linkage. The shift fork sits in a groove cut into the synchronizer…
Synchronizers
The synchronizer is a drum or sleeve that slides back and forth on the splined main shaft by means of the shifting fork. Generally, it has a bronze cone on…
Transmission Gears
Transmission gears can be classified into four groups—input gear, countershaft gears, main shaft gears, and the reverse idler gear. The input gear turns the countershaft gears, the countershaft gears turns…
Transmission Construction
Before understanding the operation and power flow through a manual transmission, you first must understand the construction of the transmission so you will be able to diagnose and repair damaged…
Manual Transmissions
A manual transmission (Figure 10-11) is designed with two purposes in mind. One purpose of the transmission is providing the operator with the option of maneuvering the vehicle in either…
Clutch Overhaul
When adjustment or repair of the linkage fails to remedy problems with the clutch, you must remove the clutch for inspection. Discard any faulty parts and replace them with new…
Pedal Pulsation
A pulsating clutch pedal is caused by the runout (wobble or vibration) of one of the rotating members of the clutch assembly. A series of slight movements can be felt…
Abnormal Noises
Faulty clutch parts can make various noises. When an operator reports that a clutch is making noise, find out when the noise is heard. Does the sound occur when the…
