Ford Escape Manuals
Ford Escape 2020-2022 Service Manual / Powertrain / Automatic Transmission / Power Transfer Unit / Description and Operation - Power Transfer Unit - Overview

Ford Escape: Power Transfer Unit / Description and Operation - Power Transfer Unit - Overview

Power Transfer Unit

The Power Transfer Unit (PTU) is a gearbox that attaches to the transmission. The PTU directs power from the transmission differential case through a dog clutch to a hypoid ring gear. A hypoid pinion gear is meshed to the ring gear and splined to the output flange. A dog clutch is used to transfer drive torque from the input shaft to the ring gear. When the dog clutch is released, no torque is transferred through the ring gear and pinion to the rear driveshaft. When the dog clutch is engaged, normal AWD function is achieved by directing torque to the rear wheels as needed to prevent or control wheel slip and improve handling

Power Transfer Unit (PTU) External Components


Item Part Number Description
1 70347034 Vent tube.
2 W719766W719766 PTU to transmission bolt. One-time use.
3 W500210W500210 Heat shield bolt
4 7F4697F469 Heat shield
5 W719768W719768 PTU to engine bracket bolts.
6 7B6647B664 PTU to engine bracket.
7 7B6967B696 Wiring harness bracket.
8 W500210W500210 Wiring harness bracket bolt.

Power Transfer Unit (PTU) Intermediate Shaft


Item Part Number Description
1 4B4224B422 Halfshaft circlip. One-time use. Part of 4C198 kit.
2 4C1994C199 Halfshaft to intermediate shaft D-Ring. One-time use. Use 4C197 (assembly aid plastic part) to assemble this 4C199. Both parts are in 4C198 kit.
3 W719767W719767 Intermediate shaft bolt. One-time use.
4 3B4703B470 Intermediate shaft bearing to PTU O-ring. One-time use.
5 3K1833K183 Intermediate shaft.
6 Intermediate shaft seal. Serviced with intermediate shaft.

Power Transfer Unit (PTU) Components


Item Part Number Description
1 63976397 Hollow Dowels. Part of 7H469 kit.
2 7L4867L486 PTU Housing. LH carrier.
3 7A0217A021 Output flange and deflector. Part of 7275 kit.
4 7G3607G360 Motor actuator. Part of 7G360 kit.
5 W790474W790474 Actuator Bolts. Part of 7P462 (O-ring Kit) & 7G360 (Actuator replacement kit) Kits.
6 7L4867L486 PTU Cover. RH carrier.
7 12A64812A648 Oil temperature sensor
8 W790475W790475 PTU Housing to Cover bolts. Part of 7R284 kit.
9 4N2824N282 Drain plug

Power Transfer Unit (PTU) Actuator Motor


Item Part Number Description
1 Actuator fork.
2 Motor Actuator.
3 Gear reduction
4 Dog clutch collar
5 Actuator cam

Power Transfer Unit (PTU) Internal Components


Item Part Number Description
1 48864886 Connecting Sleeve. Part of 7H469 kit.
2 7B6527B652 PTU to transmission compression seal. One-time use. Dust seal for cavity between transmission and PTU. Part of 7H469 kit.
3 7A2837A283 Input shaft seal – LH. One-time use. Seals brown PTU fluid from leaking into cavity between transmission and PTU. Part of 7H469 kit.
4 Selective shim for bearing preload. Not serviced.
5 Ring gear shaft bearing - LH. Not serviced.
6 Ring gear shaft. Not serviced.
7 7P2507P250 Cover O-ring. One-time use. Seals brown PTU fluid from leaking at the joint between the housing and cover. Part of 7R284 Kit.
8 Ring gear shaft bearing - RH. Not serviced.
9 Dog clutch collar . Not serviced.
10 Input shaft. Not serviced.
11 Input shaft bearing. Not serviced.
12 7H4267H426 Input shaft seal – RH. One-time use. Seals brown PTU fluid from leaking between the PTU and RH halfshaft. Part of 7H469 kit.
13 Input shaft bearing snap rings. Not serviced.
14 Selective shim for bearing. Not serviced.
15 Collapsible spacer. Not serviced.
16 Output shaft nut. Not serviced.
17 4B4224B422 Output flange circlip. One-time use. Part of 7275 kit.
18 7H4267H426 PTU Rear seal. One-time use. Seals brown PTU fluid from leaking between the housing and output flange deflector. Part of 7H469 kit.
19 Output shaft bearing. Not serviced.
20 Output shaft bearing. Not serviced.
21 Selective shim for bearing. Not serviced.
22 Output shaft. Not serviced.

Rear Seal Kit


Item Part Number Description
1 72757275 Companion flange kit
2 7H4267H426 Seal. One-time use.
3 4B4224B422 Circlip. One-time use.
4 Deflector. Part of 7A021.
5 7A0217A021 Flange and deflector

RH Halfshaft Kit


Item Part Number Description
4C1984C198 RH Halfshaft kit
2 4C1974C197 Spline protector. Use to install Halfshaft to intermediate shaft D-Ring.
3 4B4224B422 Circlip. One-time use.
4 4C1994C199 Halfshaft to intermediate shaft D-Ring. One-time use.

Case Seal Kit


Item Part Number Description
1 7R2847R284 Cover seal kit
2 W790475W790475 PTU Housing to Cover bolts. One-time use.
3 7P2507P250 Cover O-ring. One-time use. Seals brown PTU fluid from leaking at the joint between the housing and cover.

Actuator Seal Kit


Item Part Number Description
1 7P4627P462 Actuator seal kit
2 7P4617P461 Actuator to cover press in place gasket. One-time use. Seals brown PTU fluid from leaking at the joint between the actuator and cover.
3 W790474W790474 Actuator bolts. One-time use. 4 required.

Input Shaft Seal Kit


Item Part Number Description
1 7H4697H469 Input Shaft Seal Kit
2 7H4267H426 RH Input shaft seal
3 7A2837A283 LH Input shaft seal
4 7B6527B652 PTU to transmission compression seal
5 70867086 Connecting sleeve to input shaft O-ring seal
6 63976397 Hollow dowels
7 48864886 Connecting sleeve.
8 4B4224B422 Connecting sleeve snap ring

Power Transfer Unit (PTU) Operation

The PTU has four (4) distinct modes of operation: Connected, Connecting, Disconnected, and Disconnecting. Each mode is commanded by the AWD module. The PTU contains a reversible DC motor and two hall effect position sensors. The motor moves the shift fork which connects or disconnects the dog clutch collar. PTU Position sensor A monitors the position of the actuator cam. PTU Position sensor B monitors the position of the shift fork.

Connected Mode

Connected Mode is the default mode for the PTU. The AWD module will command Connected mode at the beginning of each key cycle. In connected mode, the fork and dog clutch collar are positioned towards the RH side of the PTU. The dog clutch is engaged. The driveshaft is rotating at an overdrive ratio compared to the front axle shafts. Torque is available at the RDU .

Connecting Mode

To connect the PTU, the two halves of the Dog clutch must be within 40 RPM of each other. The AWD module calculates the speed differential based on transmission OSS , RDU Driveshaft Speed, and PTU gear ratio. The actuator motor will energize and rotate the gear reduction drive and the actuator cam against the actuator fork. When the dog clutch teeth line up, the cam pushes the actuator fork into position and the clutch engages. It can take approximately 100 - 150 ms for the dog clutch to engage after the command is sent.

Disconnected Mode

The AWD module will command disconnected mode based on vehicle conditions. The purpose of the disconnected mode is to reduce drag losses from spinning the driveshaft when conditions indicate AWD will probably not be needed in the near future. In disconnected mode, the fork and dog clutch collar are positioned towards the LH or transmission side of the PTU. The dog clutch is disengaged.

Disconnecting Mode

To disengage the PTU, no torque can be routed through the dog clutch. That is, the RDU must be completely disengaged. Depending on vehicle conditions, the AWD module may keep the PTU engaged for the remainder of the key cycle. The actuator motor will energize and rotate the gear reduction drive and pull the actuator cam away from the actuator fork. When the dog clutch collar has moved far enough to the LH or transmission side, the dog clutch teeth disengage.

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