Hydraulic Control Unit (HCU): Installation

WARNING: This page is about a different car, the 2018 Lincoln Navigator. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Make sure that a new component is installed if the O-ring is damaged.

NOTE: Make sure the O-rings are installed correctly within the O-ring grooves.

If removed, install the new HCU hydraulic tube O-rings and lubricate them with clean HCU fluid.

Material

: Motorcraft® SAE 75W-85 Premium Synthetic Hypoid Gear Lubricant / XY-75W85-QL (WSS-M2C942-A)

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NOTE: Make sure the hydraulic actuator port is oriented in the axle access hole.

Verify the eLSD hydraulic actuator port is lined-up with the access hole on top of the axle.

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NOTE: Do not allow dirt or debris to fall into the access hole on top of axle, into the eLSDHCU port or the eLSD actuator port.

NOTE: Apply force to the eLSDHCU in the direction shown in the figure while tightening eLSDHCU mounting stud bolts.

Install the HCU to the axle assembly and stud bolts. Torque the HCU mounting bolts in the sequence shown in the figure.

Torque:

Stage 1: 44 lb.in (5 Nm)

Stage 2: 34 lb.ft (46 Nm)

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Remove the Gore Tex Vent tube from eLSDHCU fluid fill port.

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NOTE: The eLSDHCU to be level and in-vehicle position on the axle.

NOTE: Place a measuring device in the small vertical hole of the eLSDHCU port to measure the fluid level from the bottom of the eLSDHCU sump.

Fill the HCU with clean fluid. Refer to: Specifications .

Material: Motorcraft® MERCON® ULV Automatic Transmission Fluid / XT-12-QULV (WSS-M2C949-A) (MERCON® ULV)

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1. Verify the fluid level of HCU with a dip stick.
2. Fluid level of HCU should be within min-max (27mm-35mm) limit of a dip stick.
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Install the differential housing cover. Refer to: Differential Housing Cover .
NOTE: Make sure that new components are installed.

Install the new torque arm locating sleeves.

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NOTE: The torque arm bolts must be tightened in the sequence below. If there is clearance in-between the head of the bolt and the torque arm, remove the torque arm bolts and reinstall following the sequence below.

Position the torque arm to the rear axle housing and install the new torque arm bolts hand tight.

Torque:

Tighten item 1 to : 20 lb.ft (27 Nm)

Tighten item 2 to : 150 lb.ft (203 Nm)

Tighten item 1 to : 150 lb.ft (203 Nm)

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Install the rear axle assembly. Refer to: Axle Assembly .