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A method for commissioning a hybrid vehicle includes providing a vehicle having a chassis, a first power source disposed on the chassis and a second power source disposed on the chassis. The first power source includes a prime mover and a transmission. The prime mover is selectively engaged to a dri

A method for commissioning a hybrid vehicle includes providing a vehicle having a chassis, a first power source disposed on the chassis and a second power source disposed on the chassis. The first power source includes a prime mover and a transmission. The prime mover is selectively engaged to a driveline of the vehicle. The second power source includes a pump/motor assembly, a fluid reservoir in fluid communication with the pump/motor assembly and an energy storage unit in fluid communication with the pump/motor assembly. A neutral position of the pump/motor assembly is determined. The pump/motor assembly of the second power source is coupled to the prime mover of the first power source during pumping mode of the pump/motor assembly. Gas is purged from the second power source by routing fluid from the energy storage unit to the fluid reservoir.

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1. A method for commissioning a hybrid vehicle comprising: providing a vehicle having: a chassis;a first power source disposed on the chassis, the first power source including a prime mover and a transmission, wherein the prime mover is selectively engaged to a driveline of the vehicle;a second powe

1. A method for commissioning a hybrid vehicle comprising: providing a vehicle having: a chassis;a first power source disposed on the chassis, the first power source including a prime mover and a transmission, wherein the prime mover is selectively engaged to a driveline of the vehicle;a second power source disposed on the chassis, the second power source including a pump/motor assembly, the pump/motor assembly including a pump/motor unit having a variable swash plate and a servo actuator, a fluid reservoir in fluid communication with the pump/motor assembly, and an energy storage unit in fluid communication with the pump/motor assembly;determining a neutral position of the pump/motor assembly, wherein the neutral position corresponds to an average of the recorded signals, the neutral position determination step includes: actuating the pump/motor unit from pumping mode to motoring mode;monitoring a signal from a neutral pressure sensor that is in fluid communication with the pump/motor unit;recording the signal from the neutral pressure sensor when the signal crosses a threshold value;actuating the pump/motor unit from motoring mode to pumping mode;monitoring the signal from the neutral pressure sensor; andrecording the signal when the signal crosses the threshold value,wherein the pump/motor assembly of the second power source is coupled to the prime mover of the first power source during pumping mode of the pump/motor assembly; andpurging gas from the second power source by routing fluid from the energy storage unit to the fluid reservoir. 2. The method of claim 1, wherein the threshold value includes a neutral pressure offset value. 3. The method of claim 1, wherein the neutral position determination step includes: actuating the pump/motor unit to full stroke for pumping;recording a signal from a swashplate position sensor when the swashplate is at a full stroke position for pumping;actuating the pump/motor unit to full stroke for motoring; andrecording the signal from the swashplate position sensor when the swashplate is at a full stroke position for motoring. 4. The method of claim 3, wherein the neutral position corresponds to a position halfway between the full stroke positions for pumping and motoring. 5. The method of claim 3, wherein the second power source is disengaged from the driveline. 6. The method of claim 1, wherein the step of purging gas from the second power source includes: actuating the swashplate of the pump/motor unit to a position between the neutral position and full stroke for motoring; androuting fluid from the energy storage unit to the fluid reservoir through the pump/motor unit. 7. The method of claim 6, wherein the position of the swashplate is limited to a position less than full stroke for motoring. 8. The method of claim 1, wherein the step of purging the gas from the second power source includes: routing fluid from the energy storage unit to the fluid reservoir, wherein the fluid bypasses the pump/motor unit. 9. The method of claim 8, wherein the fluid is routed through a mode valve assembly that is disposed between the energy storage unit and the pump/motor unit. 10. A method for commissioning a hybrid vehicle comprising: providing a vehicle having: a chassis;a first power source disposed on the chassis, the first power source including a prime mover and a transmission, wherein the prime mover is selectively engaged to a driveline of the vehicle; anda second power source disposed on the chassis, the second power source including a pump/motor assembly having a pump/motor unit with a variable swashplate, a fluid reservoir in fluid communication with the pump/motor assembly, and an energy storage unit in fluid communication with the pump/motor assembly;determining a neutral position of the pump/motor unit, wherein the pump/motor unit of the second power source is coupled to the prime mover of the first power source during pumping mode, the neutral position determination including: actuating the pump/motor unit from pumping mode to motoring mode;monitoring a signal from a neutral pressure sensor that is in fluid communication with the pump/motor unit;recording the signal from the neutral pressure sensor when the signal crosses a threshold value;actuating the pump/motor unit from motoring mode to pumping mode;monitoring the signal from the neutral pressure sensor; andrecording the signal when the signal crosses the threshold value;wherein the neutral position corresponds to an average of the recorded signals. 11. The method of claim 10, further comprising purging gas from the second power source by: actuating the swashplate of the pump/motor unit to a position between the neutral position and full stroke for motoring; androuting fluid from the energy storage unit to the fluid reservoir through the pump/motor unit. 12. The method of claim 11, wherein the position of the swashplate during the step of purging gas from the second power source is limited to a position less than full stroke for motoring. 13. The method of claim 10, further comprising purging gas from the second power source by routing fluid from the energy storage unit to the fluid reservoir, wherein the fluid bypasses the pump/motor unit. 14. The method of claim 10, further comprising calibrating the swashplate position by: actuating the pump/motor unit to full stroke for pumping;recording a signal from a swashplate position sensor when the swashplate is at a full stroke position for pumping;actuating the pump/motor unit to full stroke for motoring; andrecording the signal from the swashplate position sensor when the swashplate is at a full stroke position for motoring. 15. The method of claim 14, wherein the second power source is disengaged from the driveline during the calibration of the swashplate. 16. A method for commissioning a hybrid vehicle comprising: providing a vehicle having: a chassis;a first power source disposed on the chassis, the first power source including a prime mover and a transmission, wherein the prime mover is selectively engaged to a driveline of the vehicle;a second power source disposed on the chassis, the second power source including a pump/motor assembly, a fluid reservoir in fluid communication with the pump/motor assembly, and an energy storage unit in fluid communication with the pump/motor assembly;determining a neutral position of the pump/motor assembly, wherein the pump/motor assembly of the second power source is coupled to the prime mover of the first power source during pumping mode of the pump/motor assembly; andpurging gas from the second power source while the pump/motor assembly is in the neutral position by routing fluid from the energy storage unit to the fluid reservoir; wherein a foot valve in the energy storage unit opens to route fluid stored in the energy storage unit.