# US 9,038,753 B2 · Vehicle hydraulic system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,038,753 B2 - Document ID: US9038753B2 - Status: Granted - Kind: B2 - Application number: 14/055,030 - Filed: 2013-10-16 - Published: 2014-04-17 - Granted: 2015-05-26 - Earliest claimed: 2007-04-27 - Applicants: Leonard H. Hancock, Sr. - Inventors: Leonard H. Hancock, Sr. - Web page: https://patentgrep.com/patent/US9038753B2 ## CPC - B60K 25/02: directly from an engine shaft - B60K 25/00: Auxiliary drives (arrangement of tyre-inflating pumps mounted on vehicles B60C23/10) - B60K 17/22: characterised by arrangement, location, or type of main drive shafting, e.g. cardan shaft - B60K 17/28: characterised by arrangement, location, or type of power take-off - B60Y 2200/14: Trucks; Load vehicles, Busses - B60K: ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES - B60Y: INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY ## Abstract A hydraulic system includes a power assembly connected to a vehicle drive line. The power assembly is selected from the group consisting of a split shaft power take off assembly and a transfer case. At least one hydraulic pump is connected to the power assembly. At least one hydraulic consumer is drivingly connected to the at least one hydraulic pump. The at least one hydraulic pump is selected from the group consisting of a variable displacement pump and a constant displacement pump. ## Claims ### Claim 1 A vehicle hydraulic system, comprising: a power assembly connected to a vehicle drive line, the power assembly selected from the group consisting of a split shaft power take off assembly and a transfer case; at least one hydraulic pump connected to the power assembly; and at least one hydraulic consumer operatively connected to the at least one hydraulic pump, wherein the at least one hydraulic pump is selected from the group consisting of a variable displacement pump and a constant displacement pump. ### Claim 2 (depends on 1) The hydraulic system according to claim 1, wherein the power assembly comprises a split shaft power take off assembly, wherein at least one power take off is connected to the split shaft power take off assembly, and wherein the at least one hydraulic pump is connected to the at least one power take off for driving the at least one hydraulic consumer. ### Claim 3 (depends on 2) The hydraulic system according to claim 2, including a first power take off and a second power take off connected to the split shaft power take off assembly, and at least one hydraulic pump connected to each power take off for driving at least one hydraulic consumer. ### Claim 4 (depends on 3) The hydraulic system according to claim 3, wherein the first power take off drives first and second hydraulic pumps. ### Claim 5 (depends on 3) The hydraulic system according to claim 3, wherein the second power take off drives third and fourth hydraulic pumps. ### Claim 6 (depends on 1) The hydraulic system according to claim 1, comprising at least one set of hydraulic pumps connected in series. ### Claim 7 (depends on 2) The hydraulic system according to claim 2, wherein the power take off drives a variable displacement pump and the variable displacement pump drives a constant displacement pump. ### Claim 8 (depends on 1) The hydraulic system according to claim 1, wherein the hydraulic consumers include a fire pump. ### Claim 9 (depends on 8) The hydraulic system according to claim 8, wherein the hydraulic pump is a variable displacement pump. ### Claim 10 (depends on 1) The hydraulic system according to claim 1, wherein the power assembly comprises a transfer case driven by a vehicle drive line, wherein the at least one hydraulic pump is driven by the transfer case, and wherein the at least one hydraulic consumer is driven by the hydraulic pump. ### Claim 11 (depends on 10) The hydraulic system according to claim 10, wherein the at least one hydraulic consumer includes a fire pump. ### Claim 12 (depends on 1) The hydraulic system according to claim 1, including a variable displacement pump connected to the power assembly, a constant displacement pump connected to the variable displacement pump, and at least one hydraulic user connected to the variable displacement pump or the constant displacement pump. ### Claim 13 (depends on 1) The hydraulic system according to claim 1, including a first variable displacement pump connected to the power assembly, a second variable displacement pump connected to the first variable displacement pump, and at least one hydraulic user connected to the first or second variable displacement pump. ### Claim 14 (depends on 12) The hydraulic system according to claim 12, wherein the hydraulic user is a fire pump. ### Claim 15 (depends on 13) The hydraulic system according to claim 13, wherein the second pump is a variable displacement pump and the hydraulic user is a fire pump. ### Claim 16 A method of operating a fire pump, comprising the steps of: operatively connecting a first variable displacement pump to a power assembly connected to a vehicle drive line, the power assembly selected from the group consisting of a split shaft power take off assembly and a transfer case; operatively connecting a second variable displacement pump to the first variable displacement pump; and operatively connecting a fire pump to the first or second variable displacement pump.