|  |  | Results of the tests | 
| 1 | GEARBOX SUPPORTS CHECK | All OK | Problems met | Operation | 
|---|
|  | Check
the gearbox support fastenings: they should not be slack | Continue to Step 2 | Nuts slack | Restore the correct tightening
of the slack nuts | 
| 2 | CHECKING THE CROWNWHEEL AND PINION | All OK | Problems met | Operation | 
|---|
|  | Check
the crown wheel and pinion reduction In particular: it should not
be worn or damaged; there should not be excessive clearance the
crownwheel fixings should not be slack | Continue to Step 3 | Clearance excessive | Restore the clearance or,
if necessary, replace the reduction gear  Op. 2110D28 | 
| 3 | DIFFERENTIAL HOUSING CHECK | All OK | Problems met | Operation | 
|---|
|  | Check
the wear of the satellite carrier bearing or the housing in the
differential housing | Continue to Step 4 | Casing worn | Overhaul or replace the differential
housing   Op.   2110D10 | 
| 4 | CHECK ON CORRECT OPERATION | All OK | Problems met | Operation | 
|---|
|  | Check
that the fault is no longer present |  | Fault persists | Search for the fault starting from another symptom' |