Frame-mounted pump only. Baseplate, coupling, guards and shields are sold separately.
The Berkeley B87334 B3JRMBMS centrifugal water pump combines a 4-inch NPT suction, 3-inch NPT discharge and clockwise (CW) rotation with a mechanical shaft seal and cast-iron impeller. It is a frame-mounted pump for a separately selected drive, with an integral shaft and ball-bearing assembly.
For water truck replacement or upfit work, match the pump to the drive arrangement and the flow and pressure required by your spray system. The B3JRMBMS belongs to Berkeley's 13-inch nominal impeller family. Nominal family size is not a guarantee of the supplied impeller trim or the flow produced at a particular speed.
B87334 replaces Berkeley B66924. The updated pump uses a revised impeller, volute case and wear ring. When ordering service parts, use the new pump part number so these updated components are selected correctly.
Service access without removing the plumbing
The back pull-out construction allows access to the pumping assembly while the volute remains connected to the piping. This helps simplify service when disconnecting and realigning truck plumbing would add work. A cast-iron body and enclosed impeller provide the B-series pumping configuration, while the discharge can be positioned to suit the installation.
| Feature |
Benefit |
| Back pull-out construction |
Service the pumping assembly without disturbing the connected piping. |
| Four discharge positions |
Choose the discharge orientation that suits the piping layout. |
| Mechanical shaft seal |
Uses a mechanical seal rather than a packed stuffing box. |
| Frame-mounted construction |
Allows selection of a compatible separate drive arrangement. |
Technical specifications
| Specification |
Details |
| Manufacturer part number |
B87334 |
| Model |
B3JRMBMS |
| Pump configuration |
Single-stage, frame-mounted centrifugal |
| Suction connection |
4-inch female NPT |
| Discharge connection |
3-inch female NPT |
| Rotation |
Clockwise (CW), viewed from the pulley end of the shaft |
| Shaft seal |
Mechanical |
| Impeller material |
Cast iron |
| Impeller family |
13-inch nominal; verify required trim |
| Mounting frame |
Special-duty frame |
Match the pump to your drive and water system
The same connection sizes do not make pumps with different rotations interchangeable. Select B87334 for the clockwise configuration, and compare the pump's rotation arrow with the drive before installation. A matched shaft connection, mounting arrangement and operating speed are as important as the inlet and outlet sizes.
| Component or application |
Selection guidance |
| Water truck spray systems |
Match available pump speed and required flow and pressure to the system. |
| Drive components |
Select a compatible coupling or belt-drive arrangement; confirm shaft fit and alignment. |
| Threaded plumbing |
Use mating 4-inch suction and 3-inch discharge NPT connections with independently supported piping. |
| Installation hardware |
Arrange the required baseplate, coupling, guards and shields separately. |
Before ordering
Have the existing pump nameplate and drive details available before choosing a replacement. Check the required duty point against the appropriate pump curve instead of sizing by port diameter alone. If replacing an older pump, compare mounting dimensions, impeller configuration and drive fit before committing to the change.
| Check |
What to confirm |
| Part number and rotation |
Order B87334 for CW; confirm rotation from the pulley end of the shaft. |
| Flow, pressure and speed |
Provide required flow, total head and pump RPM so the impeller configuration can be checked. |
| Suction conditions |
Verify adequate inlet supply and a priming arrangement before startup. |
| Operating protection |
Do not run dry. Fit required guards, align the drive and protect the pump from freezing. |
| Replacement installation |
Compare nameplate, mounting dimensions, shaft connection and piping orientation. |
Need help selecting your pump? Contact UnitedBuilt through online chat, email parts@unitedbuilt.com, or call 602-253-7750 with your application, drive arrangement, and required flow and pressure.
