Heidelberg GT roller bearings (4 types)

Hi everyone,

When I bought my press — a 1963 Heidelberg GT — it came with only one bearing. I then had a machine shop fashion 10 copies. But recently I looked closer at the diagram in the parts book and noticed that there are in fact four different kinds:

GT 0629 Bearing (6)
GT 0693 Bearing (2)
GT 0642 Bearing - pump-side (1)
GT 0641 Bearing - flywheel-side (1)

I uploaded an image that illustrates where they are. Does anyone here know what the design differences between the four types are?


All best,

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