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FIG 36                                             (NS)

(As an approximate reference, 1½ turns will adjust the Bogey pointers approximately 8mm); after screwing the NS stopper out the appropriate amount, the tractor unit should be turned toward the OS 90 degrees to the trailer; then straighten and line up the front pointers, and then check the rear pointers again.; if the pointers have come short of being in line, then the NS stopper should be screwed out a little further and the tractor unit turned again to the OS 90 degrees to the trailer; then line up the front pointers again and check the rear pointers; the above procedure should be repeated until the pointers are in line; now turn the tractor unit 90 degrees to the trailer in the NS direction; straighten and line up front pointers and check the rear pointers again. 
If the bogey is not in line but is toed out toward the NS, then the as stopper is screwed out too far: screw the as stopper in (using the general guide of 1½ turns to 8mm at the pointers):- with the front pointers in line, slack the lock nuts on both flow restrictors (on the front of the valve block
(see FIG 25) and screw the centre part out a few turns; place a chock in front of the rear as wheel and move the trailer forward VERY SLOWLY until the bogey is slightly toed out of line towards the as; (the pointers should only be several (mm) past the straight ahead position). 

WARNING Putting the bogey out of line more than this can cause SERIOUS DAMAGE (as explained at the end of section F in Hydraulic system). 

SCREW IN BOTH FLOW RESTRICTORS; now turn the tractor unit 90 degrees to the NS, and then straighten and check front and rear pointers; continue to adjust and check until the pointers line up. 
Finally; thoroughly tighten lock nuts on stoppers (using extension on spanner); Also make sure both flow restrictors and their lock nuts are tight. 

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