ATJ6277. Nuffield and Leyland PTO Housing Adjusting Shim. 

Shims are 0.020″ inches thick. (0.50mm). The P.T.O. shaft should have a 0.040″ clearance.

See item number 48 in the illustration. 

View here information on how to 
Remove, adjust and replace the Power Take Off Shaft and Bearing Housing Assembly on the following tractors;

• Nuffield: 10/42, 10/60, 3/45, 4/65
• Leyland: 253, 245, 344, 384, 255, 270, 262, 272, 462, 472, 282, 482, 502
• Marshall: 502