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B: REMOVE AND REPLACE
First disengage steering action between front and rear by opening ball valves (in early- type control boxes), or flow restrictors in later type valve blocks. (see FIGS 21 or 25) remove all grease pipes: carefully grind off all locating welds around edge of slew ring/rubbing plate; remove all 8 countersunk head - bolts; it will now be possible to remove the rubbing plate; 
next remove all 8 bolts; securing the slew- ring to the cross members. Renew slew ring by fitting same type unit (with rubber seals); unlike the rear turntable, the front slew ring comes un-drilled.

NOTE The holes cannot be accurately drilled by clamping the old and new slew rings face- to -face, or back to back; they should only be purchased from Muldoon Transport systems, where they are accurately drilled on special jigs. 
NOTE It is much easier to tap out grease pipe adaptor threads before fitting slew ring.
(use m8 x 1mm tap). Torque all 5/8" M16 bolts to 27ONM. 

VERY IMPORTANT Remember to fit the earth clamp to the rubbing plate only. BEFORE putting on the locating welds. (this is to stop the current passing through the bearings, and causing premature damage to the slew ring). 

10: THE WEDGE 
If the wedge has been removed, then all rust and corrosion needs to be removed from sliding surfaces. Remove any worn tape from face of the wedge and replace with new tape. (This is to stop corrosion between both metals). Apply plenty of anti - seize compound in groove etc before refitting wedge. 

11:STEERING ALIGNMENT 
Models produced prior to September 2000 require the steering aligned manually. 

Models produced after this date have an automatic alignment system. 

A: MANUAL ALIGNMENT 
WARNING - MANUAL ALIGNMENT SHOULD ONLY BE ATTEMPTED BY COMPETENT PERSONNELL AFTER HAVING READ THE FOLLOWING INSTRUCTIONS. 

SERIOUS DAMAGE CAN OCCUR IF ALL THE INSTRUCTIONS GIVEN ARE NOT FULLY ADHERED TO. 

To manually align steering, open the door on the early type control box (FIG 15). Inside will be two handles locked by a length of pipe. Using an 8mm spanner remove both handles. Check and make absolutely sure the slots in both square spindles are in the straight across position (FIG 19) 

If not, then turn them to this position. Refit both handles in line without the locking pipe fitted (FIG 20) Turn both handles to 90 degrees from this position (FIG 21) This action allows the oil to flow through the valve assembly and disconnects the movement of the front rams from the rear rams. 

Line up the pointers on the front slew ring and rear turntable (FIGS 5 & 6). Then turn both handles back in line with each other. Remove one handle and fit the locking pipe on both handles and replace the handle (FIG 22) then tighten both handles.

WARNING - FRONT AND REAR POINTERS MUST BE LINED UP BEFORE CLOSING BALL VALVES. 

IF STEERING IS OPERATED WITH POINTERS OUT OF LINE THEN SERIOUS DAMAGE WILL OCCUR AS THE RAMS BOTTOM OUT. 

(THERE ARE NO RELIEF VALVES IN THIS SYSTEM) 

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