Power Transfer Unit (PTU) Sectional View
| ITEM | DESCRIPTION |
|---|---|
| 1 | Left cover |
| 2 | Input shaft |
| 3 | Vee seal |
| 4 | Oil seal |
| 5 | Bearing |
| 6 | Synchronizer sleeve |
| 7 | Synchronizer hub |
| 8 | Taper roller bearing |
| 9 | Casing |
| 10 | Crown wheel drive gear |
| 11 | Right cover |
| 12 | Taper roller bearing |
| 13 | Triple lip oil seal |
| 14 | Crown wheel shaft |
| 15 | Pinion gear |
| 16 | Taper roller bearing |
| 17 | Collapsible spacer |
| 18 | Taper roller bearing |
| 19 | Drive flange |
| 20 | Pre-load nut |
| 21 | Oil seal |
| 22 | Pinion shaft housing |
| 23 | Synchronizer selector fork |
| 24 | Needle roller bearing |
| 25 | Oil seal |
| 26 | Circlip |
The PTU compromises a main casing, left and right covers and a pinion shaft housing. Within the casing the main components are a crown wheel drive gear and shaft, a pinion drive gear and shaft, an input shaft, a triple cone synchronizer and a hydraulic piston.
The PTU on the Active Driveline is similar in construction to the PTU used on vehicles without active driveline. The active driveline PTU has a hydraulically operated synchronizer which allows the drive from the transmission differential to be fully disconnected from the crown wheel drive shaft, allowing the vehicle to be operated in FWD only when conditions allow. This reduces frictional losses improving performance and economy.
The input shaft is connected to the transmission differential right side output shaft. Splines on the input shaft mate with splines on the transmission differential output shaft. The input shaft is supported on a ball bearing in the left cover and a needle roller bearing between the input shaft and the crown wheel shaft. The input shaft contains the engagement ring which is part of the triple cone synchronizer assembly. Weicon Anti-Seize grease is used on the input spline between transmission and the PTU to lubricate the splines.