Patent ID: 8734140

Claim:
A reversible pump for a machine having a drive shaft, the pump including: a housing having a center hub defining a first axis, a gear portion, a forward stop radial wall, a reverse stop radial wall, a suction portion, a line portion, wherein the suction portion is disposed on a first side of the center hub and the line portion is dispose on a second side of the center hub opposite the first side, and the gear portion includes an offset ring portion extending radially from an outer periphery of the gear portion, and the forward stop radial wall is disposed adjacent the outer periphery of the gear portion and an inner periphery of the offset ring portion, and the reverse stop radial wall is disposed opposite the forward stop radial wall, adjacent the outer periphery of the gear portion and the inner periphery of the offset ring portion; an offset ring disposed within the gear portion, the offset ring including a tab extending radially from an outer periphery of the offset ring, wherein the outer periphery of the offset ring defines a second axis and the inner periphery of the offset ring defines a third axis that is offset from the second axis; an outer gear disposed on the inner periphery of the offset ring; an inner gear disposed on an inner periphery of the outer gear, wherein the inner gear is splined to the drive shaft for common rotation; and a cover having a line portion and a suction portion, wherein the line portion of the cover is disposed opposite the line portion of the housing and the suction portion of the cover is disposed opposite the suction portion of the housing; and wherein the tab of the offset ring includes a plurality of channels and a first and second surface, the offset ring is disposed in one of a first and a second position, the first surface of the tab contacts the forward stop wall of the housing when the offset ring is in the first position and the second surface of the tab contacts the reverse stop wall of the housing when the offset ring is in the second position and the plurality of channels extend from the first surface of the tab to the second surface of the tab.