This seal kit is used to service 2-way slip-in logic check valves in multiple hydraulic mining shovel applications. For 6030 machines this seal kit services the logic valves used as implement pump checks. For 6040 machines this seal kit services the logic valves used as travel checks. These seals are only available within this kit, not sold separately. Seal kit may only be used to service new design (ex 638-7679) logic valves