Synchronizer Piston Operation
| ITEM | DESCRIPTION |
|---|---|
| A | Disengaged |
| B | Engaged |
| 1 | Detent |
| 2 | Synchronizer sleeve |
| 3 | Synchronizer selector fork |
| 4 | Piston |
The synchronizer piston is located in a bore in the PTU casing. Hydraulic pressure is supplied from the RDU pump via the AWD valve block.
Two hydraulic lines from the valve block supply hydraulic pressure to each side of the synchronizer piston to engage or disengage the synchronizer. Once the piston is in the engaged or disengaged position, hydraulic pressure is not required to hold it in this position.
The piston has an orifice which allows the system to be self bleeding, allowing any air trapped to pass from one side of the piston, via the orifice, to the other side of the piston. The system allows a measured leakage through the orifice which allows the low pressure side of the piston to act as a return line.