Mercedes C-Class

W203 since 2000 of release

Repair and operation of the car

+ Mercedes-Benz cars of class C (W-203)
+ Operation manual
+ Routine maintenance
+ Engine
+ Cooling system and heating
+ Power supply system and release
+ Engine electric equipment
- Manual transmission
   Removal and installation of the check point
   Adjustment of the drive of management of the check point
+ Automatic transmission
+ Coupling and power shafts
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment

Manual transmission

General information

General view of RKPP

716.6 belongs to the class of completely synchronized 2-valny 6-staged check points with one reverse gear which were widely used on rear-wheel cars (both petrol, and diesel). Four versions of the 6-staged boxes calculated under torque from 250 to 400 Nanometers are released.

6-staged RKPP 716.6

1 — the Main shaft of the check point
2 — the Synchronizing ring of 5/6 transfers
3 — the Shaft
4 — a backing bearing Insert
5 — an inclusion Cam
6 — an inclusion Axis
7 — the Flange of connection with the driveshaft

RKPP elements

1 — the Entrance shaft
2 — the Main shaft
3 — the Intermediate shaft
4 — the Forward case
5 — the Back case
6 — the Release device of coupling
7 — the Multiconical synchronizer of switching 1/2
8 — the Multiconical synchronizer of switching 3/4
9 — the Gear wheel of the 1st transfer
10 — the Gear wheel of the 2nd transfer
11 — the Gear wheel of the 3rd transfer
12 — the Gear wheel of the 4th transfer
13 — the Gear wheel of the 5th transfer
14 — the Gear wheel of the 6th transfer
15 — the Gear wheel of the reverse gear
16 — the Central rod of switching
17 — the Module of internal switching
18 — the Intermediate gear wheel of the reverse gear

Competent use of the 6th transfer allows to achieve essential economy of fuel consumption due to decrease in working turns of the engine. In view of design features.

6-staged transmissions have bigger weight, than 5-staged.

The box perceives torque from the engine by means of usual coupling of the dry type equipped with the automatic compensator of wear. The transmission has a tight design and is filled with the gearbox oil which is not needing replacement.

Accuracy and ease of the switchings of transmission having the short course is reached by the following features of a design:

· Shtokovo-trosovy execution of the drive of switching;
· Application of the central rod of switching fixed in needle bearings;
· Use of multiconical synchronizers of switchings of the 1st, 2nd, 3rd and 4th transfers;
· Full synchronization of the reverse gear.

Reduktorny assemblies with shaft are located between two bearing planes. The third bearing plane used in earlier 5-staged boxes in this design is eliminated.

The two-section separate case is made of light alloy and pressurized by means of a special liquid compound.

The entrance shaft (1) is recorded in a flywheel by means of the directing bearing, and a transmission case - by means of the ball bearing with a profound flute. Main (2) and entrance (1) shaft are jointed among themselves in the general plane of a case of transmission and fixed by means of ball bearings with a profound flute.

The intermediate shaft (3) has the facilitated hollow design and is fixed in the roller coupling and the ball bearing with a profound flute.

In view of the minimum production admissions of semi-cases and gear wheels, and also due to use of roller couplings, need for adjustment of axial side plays of shaft disappears.

Movements of the lever of gear shifting are transmitted through drafts on a box. The box can be removed without removal of the engine. It is necessary to remove a box at coupling removal, when replacing a box or its repair. It is not recommended to make repairs of a box in house conditions. Management of RKPP is described in the Head the Operation manual.