Case 850M Tier 4A (interim) Crawler Dozer description of the catalogue:

Crawler Dozer 850M Tier 4B workshop service manuals

850M Long Track (LT) - Tier 4B (final) [NGC103138 - ]
850M Wide Track (WT) / Low Ground Pressure (LGP) - Tier 4B (final)
[NGC103138 - ]