Fits: 66 Hydra-Lectric System (Hydra-Lectric System for late model) | 77 Hydra-Lectric System (Hydra-Lectric System for late model) | 88 Hydra-Lectric System (Hydra-Lectric System for late model). Jensales is proud to bring you the Service Manual for your Oliver 77 Hydra-Lectric System. At 176 pages, this Service Manual (a.k.a. Shop, Repair, Overhaul, Technical Manual), is what your Oliver needs for repair, overhaul or restoration. Our historically accurate reproductions include the essential information needed, like engine specifications (except chassis only manuals), machine specifications, tune-up specifications, and torque settings. We know your 77 Hydra-Lectric System means a lot to you. Trust Jensales to be the first to get you the right information.