Manual Transaxle

Manual Transaxle








General View

The MTX75 manual transaxle is a 2-shaft transaxle.
MTX-75 means:
^ M: Manual
^ T: Transmission
^ X Transaxle (front wheel drive)
^ 75 Distance between input and output shaft in mm.
The aluminum transaxle housing comprises two closed sections. Additional reinforcement ribbing has been added to the transaxle housing to reduce noise and vibrations.
All the gar wheels in the "2-shaft transaxle" are in constant mesh. In each gear the required transaxle ratio is achieved by means of a pair of gear wheels.
When reverse gear is selected, the direction of rotation of the output shaft is changed by an idler gear.
The input and output shafts run in taper roller bearings.
To further improve stability and gear shifting, the selector mechanism has been revised to incorporate a maintenance-free cable operating mechanism.
All the gear wheels, including reverse gear, are bevel cut, synchronized and run on needle roller bearings.
First, second and third gears are dual-synchronized for easy gear shifting.

Input and Output Shaft





General View of Input and Output Shaft





In neutral, none of the gears is connected to the input or output shaft via the relevant synchronizer unit. No torque is transmitted to the differential.
The input and output shafts are each seated in one taper roller bearing in the transaxle housing section on the clutch side and one taper roller bearing in the transaxle housing section on the transaxle side.
The output shaft drive pinion is in constant mesh with the differential drive annulus.
The 3rd and 4th gear wheels and the 3rd/4th gear synchronizer are located on the input shaft. The gearing for 1st, 2nd and reverse gears is an integral part of the input shaft.
The 1st, 2nd, 5th and reverse gear wheels and the 1st/2nd gear synchronizer and 5th/reverse gear synchronizer are located on the output shaft. The gearing tore 3rd and 4th gear is an integral part of the output shaft.

Differential
The main components of the differential are:
^ Output gear wheel
^ Spur gear
^ Four pinions at right angles to one another
^ Differential housing with two taper roller bearings
The transaxle and differential are installed in a two-part aluminum housing which is flange-mounted to the engine.
The input shafts have serrated teeth and are secured with a snap-ring.
The torque is transmitted from the spur gear to the input shafts via two differential pinions mounted on the differential pinion shaft and the input shaft pinions.
When cornering, the drive gears need to turn at different speeds as the road wheels travel different distances. This is achieved by means of the differential pinions which turn on their own shaft and mesh with the input shaft pinions turning at different rates.

Power Flow





1st gear




2nd gear




3rd gear





4th gear




5th gear




Reverse gear




Reverse gear idler

The reverse gear idler is driven off the input shaft. Its function is to reverse the direction of rotation of the output shaft in reverse gear.
The reverse gear idler is located on the idler gear shaft together with a needle bearing.







Selector interlock mechanism

The selector interlock mechanism and the selector finger are mounted on a sleeve in the selector mechanism housing and keep the selected gear engaged with the aid of a spring-loaded ball until another gear is selected.
The selector interlock mechanism has three positions.
The reversing lamp switch is mounted on the side of the selector mechanism housing.

General Illustrations








Input shaft








Output shaft (right-hand side shown)








Output shaft (Left-hand side shown)





Selector mechanism





Selector mechanism housing





Selector Gate