Pumps Equipped with Hydraulic Motor
Startup and Operation
Open Center Systems
The 7560 series pump hydraulic motors are not equipped, from the factory, with a bypass for excess hydraulic flow in a
given system. In situations where the hydraulic system has more flow than the motor is rated for, an external bypass
must be mounted to the hydraulic lines. Failure to restrict the pump to these levels may result in leaks and premature
pump failure. To plumb the hydraulic motor into an open center hydraulic system that is not sized to the 7560 pump
requirements, follow these installation instructions:
1. Ensure there is a bypass valve in the high pressure hydraulic line. Route bypass flow either to the return line or
directly back to tank.
2. Prime the pump as above with all valves open.
3. Open hydraulic bypass all the way. Start hydraulic system and allow oil to circulate for approximately 10 to 15
minutes or until adequately warmed to 135°F (57°C).
When operating a Hypro pump with a hydraulic motor, the maximum allowable temperature of the hydraulic fluid
passing through the motor is 135°F (57°C).
4. Gradually close the hydraulic bypass valve until the pump reaches the desired pressure or flow.
5. Lock down the system hydraulic bypass valve in this position. DO NOT let the pump exceed its maximum
pressure or flow. Failure to restrict the pump to these levels may result in leaks and premature failure.
Closed Center (Load Sensing) Systems
1. Set the system hydraulic flow control valve for minimum hydraulic oil flow to the remote outlet (Tortoise position).
2. Prime the pump as above with all valves open.
3. Start the hydraulic system and allow the hydraulic oil to circulate for approximately 10 to 15 minutes or until
adequately warmed to 135°F (57°C).
When operating a Hypro pump with a hydraulic motor, the maximum allowable temperature of the hydraulic fluid
passing through the motor is 135°F (57°C).
4. Increase system hydraulic flow until pump reaches desired pressure or flow.
5. Lock down the system hydraulic bypass valve in this position. DO NOT let the pump exceed its maximum
pressure or flow. Failure to restrict the pump to these levels may result in leaks and premature failure.
Shutdown
Standard spool valves, which are found on all tractor hydraulic systems, may cause potentially damaging high peak
pressures in the hydraulic system when closed because of abrupt shut-off of oil flow in both the supply and return lines.
When shutting off the pump, move the selector to the FLOAT position to allow the pump to come to a stop gradually. If
pump will not be used for several hours, it must be cleaned in accordance with the “Cleaning” section of this manual.
PTO/Belt Drive/Flexible Coupling
Startup and Operation
1. Prime the pump as described above with all valves open.
2. Start PTO/ Gas Engine/or Flexible coupling. If possible, slowly increase the RPM until the desired flow or
pressure is reached. DO NOT let the pump exceed its maximum pressure or flow. Failure to restrict the pump to
these levels may result in leaks and premature failure.
Shutdown
Slowly decrease RPM until the pump comes to a stop, and then close all valves in the system. If pump will not be used
for several hours, it must be cleaned in accordance with the “Cleaning” section of this manual.
Start-Up, Operation, Shutdown - cont’d.
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