The Muncie PL12705CSBB hydraulic gear pump/motor provides a versatile option for compatible mobile hydraulic systems requiring higher flow. Its bi-rotational operation and four-port design support use as a mechanically driven hydraulic pump or a high-speed, low-torque hydraulic motor. Cast iron construction, a solid one-piece shaft, and heavy-duty roller bearings support durability in mobile hydraulic applications.
This configuration combines 6.37 cu in/rev displacement and 27 GPM nominal pump flow at 1,000 RPM with an SAE C 4-bolt mounting flange and 1-1/4" 14-tooth splined shaft. Side and rear SAE O-ring boss connections offer plumbing flexibility when matching the unit to an existing installation or planning a new hydraulic circuit.
Flexible connections for mobile hydraulics
The PL Series combines a cast iron housing with a choice of connection locations to accommodate different equipment layouts. On this model, 1-1/2" ORB side ports and 1-1/4" ORB rear ports give installers options for routing hydraulic lines around nearby components.
Bi-rotational operation supports different drive arrangements, but correct inlet and outlet routing remains essential. Select the unit by its complete mounting, shaft, port, and operating specifications; nominal flow alone does not establish compatibility with a PTO, coupling, or driven component.
| Feature |
Practical benefit |
| Cast iron construction |
Provides a robust housing for mobile hydraulic applications. |
| Pump or motor operation |
Supports hydraulic flow generation or conversion of hydraulic power into shaft rotation. |
| Bi-rotational design |
Accommodates either direction of rotation with the correct circuit arrangement. |
| Side and rear ports |
Provides connection choices to suit available plumbing space. |
| SAE C mounting and splined shaft |
Defines the mechanical interface needed to match the drive or driven equipment. |
Technical specifications
| Specification |
Details |
| Manufacturer |
Muncie Power Products |
| Manufacturer part number |
PL12705CSBB |
| Formatted model number |
PL1-27-05CSBB |
| UnitedBuilt SKU |
0012680 |
| Series |
PL Series |
| Displacement |
6.37 cu in/rev |
| Nominal pump flow |
27 GPM at 1,000 RPM |
| Mounting flange |
SAE C 4-bolt |
| Shaft |
1-1/4" 14-tooth spline |
| Side ports |
1-1/2" SAE O-ring boss |
| Rear ports |
1-1/4" SAE O-ring boss |
| Rotation |
Bi-rotational |
| Operating speed range |
600–2,500 RPM |
| Maximum pressure |
2,500 PSI |
| Integral pressure relief option |
Not included in this configuration |
Choosing between pump and motor operation
When used as a pump, the PL12705CSBB converts mechanical input into hydraulic flow. Its 27 GPM designation refers to nominal pump output at 1,000 RPM; actual delivery changes with shaft speed and operating conditions. Confirm that the drive can supply the speed and power required by the intended hydraulic load.
When used as a motor, hydraulic flow drives the shaft. Selection requires matching available circuit flow and pressure to the driven equipment’s speed and torque requirements. The nominal pump-flow designation should not be treated as a complete motor performance rating.
| Application |
Selection requirement |
| PTO-driven hydraulic pump |
Match the PTO interface, shaft engagement, rotation, operating speed, and available power. |
| Hydraulic motor |
Match circuit flow and pressure to required output speed, torque, and duty cycle. |
| Replacement pump/motor |
Compare the complete model number, flange, shaft, port sizes, and installation clearance. |
Before ordering
This configuration does not include the optional integral pressure relief valve. Confirm that the hydraulic circuit provides suitable pressure protection and that relief settings suit the pump/motor and connected components.
Check the complete installation before ordering, particularly when replacing a unit with a similar displacement or flow designation. For sustained operation, confirm the intended pressure, speed, fluid temperature, and duty cycle for the application.
| Selection check |
What to confirm |
| Mounting and shaft |
SAE C 4-bolt interface, matching 14-tooth spline, and correct shaft engagement. |
| Hydraulic connections |
Correct ORB fittings, hose clearance, and inlet/outlet routing for the selected rotation. |
| Operating requirements |
Required flow, pressure, speed, and duty cycle within applicable limits. |
| Pump inlet conditions |
Maximum inlet vacuum of 5 in Hg and maximum inlet back pressure of 150 PSI. |
| Hydraulic fluid |
Suitable viscosity for startup and operating temperatures. |
| System protection |
Appropriate pressure relief and protection for the complete circuit. |
Need help selecting the correct pump or motor? Contact UnitedBuilt through online chat, email parts@unitedbuilt.com, or call 602-253-7750 with your application, drive arrangement, and required flow and pressure.
