ar2650b042017a

Check wear limits of synchronizer rings

Tipo ar · tema 26.50 · versione 0201 · 2020-03-23

Valido per: Transmission 712.612 in model 688, 979 Transmission 712.612/623 in model 368, 382, 384, 685, 688 Transmission 712.622/631 in model 368.0/1 Transmission 712.623 in model 693, 694 Transmission 712.631 in model 384.334

Non disponibile in “it”; mostrato in Inglese.

Collocazione

Gruppo funzionale 2 Telaio › 26 Cambio meccanico, presa di forza secondaria › 26.50 Ruotismi, alberi, differenziale — Serie 368 · Serie 382 · Serie 384 · Serie 685 · Serie 688 · Serie 693 · Serie 694 · Serie 979

EinPAS 17 Organi della trasmissione/assale › 17.20 Cambio › 17.20.50 Albero/ruota dentata/sincronizzazione — Serie 368 · Serie 382 · Serie 384 · Serie 685 · Serie 688 · Serie 693 · Serie 694 · Serie 979

Valido anche per motori/cambi: 712 612, 712 622, 712 623, 712 631

AR26.50-B-0420-17A

Check wear limits of synchronizer rings

Transmission

712.612 in model 688, 979

Transmission

712.612/623 in model 368, 382, 384, 685, 688

Transmission

712.622/631 in model 368.0/1

Transmission

712.623 in model 693, 694

Transmission

712.631 in model 384.334

Drive shaft

Number

Designation

Gearbox 712.62/64, 715.054

Transmissions 712.63, 715.064

BE26.50-B-1001-03F

Reserve of synchronization

First gear- minimum dimension

mm

0,7

0,7

First gear - established dimension

mm

2,0

2,0

Second gear - minimum dimension

mm

0,7

0,7

Second gear - established dimension

mm

2,0

2,0

Third gear - minimum dimension

mm

0,7

0,7

Third gear - established dimension

mm

2,0

2,0

Fourth gear- minimum dimension

mm

0,7

0,7

Fourth gear - established dimension

mm

2,0

2,0

Fifth gear- minimum dimension

mm

0,5

0,5

Fifth gear - established dimension

mm

1,5

1,5

Sixth gear - minimum dimension

mm

0,5

0,5

Sixth gear - established dimension

mm

1,5

1,5

Check wear limits of synchronizer rings

Measure A = 1st gear
Measure B = 2nd gear
Measure C = 3rd gear
Measure D = 4th gear
Measure E = 5th gear
Measure F = 6th gear

Sync measurement arrangement

W26.50-0066-05

Check wear limits of synchronizer rings

1

Attach the transmission main shaft from the power outlet side to a bench with the jaws properly protected.



2

Fit the sixth and fifth gear sliding clutch into neutral.



3

Press the synchronizer ring (2) upwards through the sliding coupling sleeve until resistance is noticeable when the synchronizer cone (1) is turned. (When rotating and measuring the synchronizer cone (1) press down slightly).


Do not flank the synchronizer ring This will cause an incorrect measurement.



4

Measure the 6th gear synchronization reserve with the blade calibrator (the stipulated and minimum measurement should be consulted in the table). . 


Check the synchronization reserve F across the perimeter and calculate the average value.


If the minimum measurement is not obtained, replace the synchronizer ring.


W26.50-0067-01

Check wear limits of synchronizer rings

5

Press the synchronizer ring (4) through the sliding sleeve against the 5th gear (3) until the gear (3) is slightly resistant.


Do not flank the synchronizer ring This will cause an incorrect measurement.



6

Measure the 5th gear synchronization reserve with the blade calibrator (the stipulated and minimum measurement should be consulted in the table).


Check the synchronization reserve F across the perimeter and calculate the average value


If the minimum measurement is not obtained, replace the synchronizer ring.


W26.50-0068-01

Check wear limits of synchronizer rings

7

Fit the third and fourth gear sliding clutch into neutral.



8

Press the external synchronizer ring (2) upwards through the sliding sleeve upwards against the 4th gear (5) until, when turning the gear (5), a slight resistance is noticeable.


Do not flank the external synchronizer ring This will cause an incorrect measurement.



9

Measure the 4th gear total synchronization reserve with the blade calibrator (the stipulated and minimum measurement should be consulted in the table).


Check the synchronization reserve D across the perimeter and calculate the average value.


If the minimum measurement is not obtained, replace the synchronizer ring.


W26.50-0069-01

Check wear limits of synchronizer rings

10

Press the external synchronizer cone (8) through the sliding sleeve downwards against the 3rd gear (7) until the gear (7) is slightly resistant.


Do not flank the synchronizer ring This will cause an incorrect measurement.



11

Measure the 3rd gear total synchronization reserve with the blade calibrator (the stipulated and minimum measurement should be consulted in the table).


Check the synchronization reserve C across the perimeter and calculate the average value.


If the minimum measurement is not obtained, replace the synchronizer ring.


W26.50-0070-01

Check wear limits of synchronizer rings

12

Fit the first and second gear sliding clutch into neutral.



13

Press the external synchronizer cone (10) through the sliding sleeve upwards against the 2nd gear (9) until the gear (9) is slightly resistant.


Do not flank the external synchronizer ring (10) This will cause an incorrect measurement.



14

Measure the 2nd gear total synchronization reserve with the blade calibrator (the stipulated and minimum measurement should be consulted in the table).


Check the synchronization reserve B across the perimeter and calculate the average value.


If the minimum measurement is not obtained, replace the synchronizer ring.


W26.50-0071-01

Check wear limits of synchronizer rings

15

Press the 2nd and 1st gear sliding sleeve fully upwards (attach 2nd gear).



16

Press the external synchronizer cone (12) through the sliding sleeve downwards against the 1st gear (11) until the gear (11) is slightly resistant.


Do not flank the external synchronizer ring This will cause an incorrect measurement.



17

Measure the 1st gear total synchronization reserve with the blade calibrator (the stipulated and minimum measurement should be consulted in the table)


Check the synchronization reserve A across the perimeter and calculate the average value.


If the minimum measurement is not obtained, replace the synchronizer ring.


W26.50-0072-01