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NOTE automatic alignment is fitted on the last of the early type valve manifolds (fig 23) Also on all later type valve blocks (see FIG 24). 

B: AUTOMATIC ALIGNMENT 
Automatic alignment occurs when the tractor unit is turned 90 degrees to the trailer in both left and right directions; it will be necessary to carry out the above operation EVERY TIME the tractor unit and trailer are un-coupled and re-coupled, or if steering axle misalignment occurs. 

After turning the tractor unit 90 degrees in both directions, line up the front pointers; if the rear Bogey pointers do not line up and they are more than a couple of millimetres out, then check the following for wear etc: 
I : All Ram Bearings
2: All Ram Pins 
3: Cam Follower Bearing
4: Front Slew Ring 
5: Bell Crank Centre Bush 
6: Rear Bogey has been changed (see section II-D)
7: Air in the Hydraulic System (see section 3) 

C: REAR BOGEY STOPPERS 
FIRST. repair and resolve any of the above faults that may be present; if ALL the above are in good order, then the pointers should line up. If not, then proceed as follows: 

If for example the pointers show the bogey is toed out toward the NS (near side), then turn the tractor unit to 90 degrees towards the as, (offside); then line up the front pointers and check the rear pointers again; if they line up ok then the as stopper is screwed out to far (FIG 35); if they still show the Bogey as toed out to the NS then the NS stopper will need to be screwed out see (FIG 36).

FIG 35                                 (OS)

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