The Muncie PK11502BSBB hydraulic gear pump/motor provides a versatile option for mobile hydraulic systems requiring either mechanically driven hydraulic flow or hydraulic-powered shaft rotation. Its bi-rotational design supports clockwise or counterclockwise operation when installed and plumbed for the application.
This PK Series configuration combines 3.45 cu. in. displacement per revolution, nominal pump output of 15 GPM at 1,000 RPM, SAE B mounting, and a 7/8" 13-tooth splined shaft. Side and rear straight-thread O-ring ports provide plumbing options when fitting a replacement unit or planning a new installation.
Durable construction with flexible connections
Cast iron construction, a solid one-piece shaft, and heavy-duty roller bearings support the PK Series’ use in demanding mobile hydraulic applications. The four-port arrangement gives installers a choice of connection locations, helping accommodate hose routing and surrounding equipment.
The ability to use the unit as either a pump or motor also makes it useful across different hydraulic system designs. Select it by the required displacement, shaft connection, mounting arrangement, and operating conditions—not by nominal flow alone.
| Feature |
Practical benefit |
| Bi-rotational design |
Supports either direction of rotation with appropriate plumbing |
| Pump/motor capability |
Serves different hydraulic power-transfer requirements |
| Cast iron construction |
Provides a robust housing for mobile hydraulic service |
| Heavy-duty roller bearings |
Support the rotating assembly |
| Solid one-piece shaft |
Provides a direct mechanical drive connection |
| Side and rear ports |
Offers flexibility in hose routing |
Technical specifications
| Specification |
Detail |
| Manufacturer |
Muncie Power Products |
| Manufacturer part number |
PK11502BSBB |
| Alternate formatted part number |
PK1-15-02BSBB |
| UnitedBuilt SKU |
0012611 |
| Series / size |
PK / PK1-15 |
| Displacement |
3.45 cu. in./rev |
| Nominal pump flow |
15 GPM at 1,000 RPM |
| Mounting flange |
SAE B, 2- and 4-bolt |
| Shaft |
7/8" diameter, 13-tooth spline |
| Side ports |
1-1/4" SAE straight-thread O-ring |
| Rear ports |
1" SAE straight-thread O-ring |
| Rotation |
Bi-rotational |
| Published speed range |
600–2,500 RPM |
| Maximum pressure |
2,500 PSI |
| Integral pressure relief |
None |
Choosing between pump and motor operation
In pump service, the shaft receives mechanical power and produces hydraulic flow. The 15 GPM designation refers to output at 1,000 shaft RPM; it is not a constant flow rate at every operating speed.
In motor service, hydraulic flow drives the shaft. Select the unit against the required shaft speed and torque, available hydraulic supply, and system losses. Muncie classifies the PK Series for high-speed, low-torque motor applications.
| Application |
What to match |
| Direct-mounted hydraulic pump |
PTO output flange, spline, available torque, and operating speed |
| Hydraulic motor |
Supply flow and pressure, required output speed and torque, and return conditions |
| Replacement pump/motor |
Complete part number, displacement, shaft, mounting, and port arrangement |
Before ordering
This configuration has no integral pressure relief valve. Provide appropriate system pressure protection.
| Check |
Guidance |
| Mounting fit |
Confirm bolt pattern, pilot dimensions, spline engagement, and installation clearance |
| Port connections |
Use matching SAE straight-thread O-ring fittings |
| Rotation and plumbing |
Verify the required inlet/outlet arrangement for the direction and application |
| Operating conditions |
Keep speed and pressure within the model’s ratings |
| Pump inlet conditions |
Observe the published maximum inlet vacuum of 5 in. Hg and inlet back pressure of 150 PSI |
| Hydraulic fluid |
Follow Muncie’s viscosity and startup recommendations |
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.
