Defender & Discovery 1 Ashcroft 24 Spline Diff Lock

Features:

• A unique non-rotating annular piston locking actuator is designed to eliminate air leaks sometimes found with rotating seals
• The annular piston is also designed to eliminate the oil blow back in the air exhaust line
• The large piston area give maximum hold-in force to reduce the possibility of jumping out of lock
• Locking ring gives full 6mm positive engagement with side gear, again reducing the possibility of jumping out of lock
• Gears have been redesigned for maximum strength and durability
• The lock ring is made from high spec 300m steel to provide ultimate strength and ability to withstand shock loads
• Locking actuator cage made from steel to withstand shock loading caused by power locking
• Locker body turned from billet 817M40T (EN24T) to give optimum strength
• Only change necessary to fit the locker is drill and tap the diff housing 1/4" bsp for the air feed fitting
• No changes to the axle case

Specifications:

• Product Type: Differential Lock
• Vehicle Placement: Front, Rear

Installation Information:

1) Installing your Locker into the Differential

Remove the stock diff centre but be sure to mark the bearing caps so they are refitted on the correct side, Drill and tap the diff housing 1/4 BSP.

Fit the crown wheel to the new centre, install locker and set preload and backlash as per factory specs. There are two lengths of Journal end cap bolts used, 50mm for the non dowelled cap and 60mm for the dowelled cap, select the bolt 5mm longer than stock to fit the cylinder locking tab so that the tab stops the cylinder rotating.

2) Installing the Air Lines

Once the air compressor is mounted remove the nut and coil from the solonoid and fit to the air compressor with the 1/8 BSP M/M nipple.

Fit the 1/8 tapered 90 deg push fit elbow to the other port.

Fit the brass 1/8 parallel 90 deg elbow compression fitting to the locker cylinder and fit the copper pipe to this fitting, pass the other end through the tapped hole in the diff housing.

Once the copper pipe is through the taped hole, fit the brass adapter nut from the outside and mark the pipe flush with the brass nut, remove nut and cut pipe, refit nut, fit the small O ring, fit 1/8 parallel 90 deg push fit elbow.

Fit air line between this push fit connector and the one on the solenoid.

3) Installing the Switches and Electrical Connections

Rear Switch

Pin 8, dash illumination, on ARB loom is blue/white (shows red bar when side light on)

Pin 7, ground, on ARB loom use black (either one)

Pin 2, feed, on ARB loom use red

Pin 3, to rear solenoid, on ARB loom use yellow

Front Switch

Pin 8, dash illumination, on ARB loom is blue/white (shows red bar when side lights on)

Pin 7, ground, on ARB loom use black (either one)

Pin 2, feed, on ARB loom use yellow

Pin 3, to front solenoid, on ARB loom use green

Connecting to the Solenoids

The connector on the ARB compressor loom cannot be used so please snip this off and crimp on the 2 spade connectors supplied with the locker, connect these 2 spades to the 2 parallel pins on the solenoid.

4) Final Testing

Handbrake off, Centre diff unlocked, mainbox in neutral, Jack up one wheel, the wheel should spin freely, Switch the air compressor on, allow it to run up to pressure, Select the locker whilst spinning the wheel and it should stop dead.

Switch the locker off and the wheel should spin freely again.

Please note if you are using your own air compressor we would suggest using between 70-100 psi.

Torque Settings:

Crown Wheel Bolts (Nm): 58

Bearing Caps (Nm): 90

Compatibility:

• Land Rover Defender 1993 onwards - Front & Rear
• Land Rover Discovery 1/2 1993-1998 - Front & Rear
• Land Rover Range Rover Classic 1993-1996 - Front & Rear