Hello Peter.
I was wondering how you have got on with your Problem.
I served my Apprenticeship as a Fitter/ Motor Mechanic at British Standard Machinery at Mascot Sydney from 1954/59 and have worked on the Grader Assembly Line. Your Grader should have a AEC 7.7 Engine 95 HP
The Clutch is a Single Drive Plate Borg & Beck Type, that can be removed from the Machine without removing the Engine !!!
Have You tried to Stall the Engine with Brakes on, or connected to a Tree with a Chain or Cable to see if you can Slip the Clutch? If the Clutch will be Slipping and the Engine only slows down, This means that you have to Reco the Clutch Assy. If it Stall the Engine that means the Clutch Assy is OK !
Sorry I have a change of Phone Number... 03) 8288-1062,
email
brockw38@optusnet.com.au
Regards Winston Brocklehurst,
PS. I know of two other Contacts with your type of Grader in NSW.