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Ashcroft Locker - P38/Wolfe

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  • Installation

    INSTALLATION GUIDE

    We have separated our installation guide into four main categories.

     

    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 are tap the diff housing, the drill size is 29/64" but 11.5mm will work OK. Then tap ¼ BSPF (19 tpi) here :

     

     

    Fit the crown wheel to the new centre, install locker and set preload and backlash as per factory specs. Fit the cylinder locking tab so that the tab stops the cylinder rotating, see below.

     

    2) Installing the Air Lines

     The solenoid is marked as shown and should be fitted as follows:-

     

     

     

    P = Air Compressor

    R = Exhaust

    A = Diff (nylon air feed pipe)

     

    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, see photo below, it must be this way round:

     

     

    Fit the 1/8” tapered 90 deg push fit elbow to the other port. Refit the coil:

     

     

    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. We would suggest fitting the pipe like this to allow some flex in the pipe :

     

     

    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, main box 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.

     

    Torque Settings:

    Crown Wheel Bolts: 58 Nm

    Bearing Caps: 90 Nm