Franklin Electric Hydraulic Driven Self-Priming Pumps
- FMIH-40 runs off tractor or truck hydraulics
- 7/8 inch SAE B spline shaft mounts to a B-pattern hydraulic motor
- Passes mud, sand, and silt up to 10% by volume
- Replaceable wear plate and built-in check valve
- No generator, fuel tank, or power line to manage
- Send us your hydraulic motor details and we will confirm the fit
A 7/8 inch SAE B spline is the link between a Franklin Electric hydraulic driven self-priming pump and a hydraulic motor powered by the tractor or truck you already run. The FMIH-40 bolts to a hydraulic motor, pulls water up from a pond, pit, or tank, and works wherever that machine can park. It also passes muddy water with up to 10% solids by volume.
The FMIH is the hydraulic member of a three-pump family. The FMIT runs on an electric motor, gas engine, belt drive, or PTO shaft, and the FMIG carries its own gas engine.
Jobs Where Tractor Power Wins
The FMIH-40 fits when a tractor, water truck, or other machine with spare hydraulic flow is already on site. It connects through a 7/8 inch SAE B spline and a matching hydraulic motor, primes itself, and passes water with up to 10% solids by volume.
- Farm irrigation: run water from a pond or ditch using the tractor already parked at the field.
- Water trucks: fill and spray from truck hydraulics without a second engine to fuel.
- Construction dewatering: pull muddy water out of pits and trenches.
- Mining sites: move silty water where power is far away.
Your Hydraulics on One Page: What to Send Us
- The machine: tractor, truck, or other equipment, with its auxiliary hydraulic flow and pressure rating.
- Your hydraulic motor: brand and model, if you already own one.
- The water side: suction lift, discharge height, and the flow you need.
We compare those numbers to the FMIH-40 curve before you order, so the pump runs at the right speed on your machine.
FMIH-40 Build Details
| Part | What it is | Why it matters |
|---|---|---|
| Drive shaft | 7/8 inch SAE B-fit spline | Mounts to a B-pattern hydraulic motor |
| Pump case and impeller | Cast iron, ASTM A48 Class 30 | Stands up to rough field use |
| Impeller type | Semi-open | Passes mud, sand, and silt up to 10% by volume |
| Wear plate | Replaceable cast iron | Restores performance after abrasive water |
| Check valve | Cast iron with neoprene flapper | Holds water in the casing between starts |
| Mechanical seal | Carbon, ceramic, FKM, 316 stainless | Seals the shaft where it enters the case |
| Bearings | Two ball bearings | Carry the shaft load |
Pump End, Motor, and Hoses: Budgeting the Setup
The pump end is only part of the bill. A setup with a hydraulic motor, hoses, and fittings costs more than the bare FMIH-40.
Many buyers already own the motor and hoses, which keeps the total lower. Tell us what you have, and we will quote only what you need.
No Spare Hydraulic Flow? Other Ways to Move the Water
- You have no machine with spare hydraulic flow. A portable gas engine pump carries its own power.
- Your water source sits above the pump. A hydraulic driven centrifugal pump may fit without self-priming.
- You want to compare every drive type. Browse the full range of Franklin Electric self-priming pumps.
Frequently Asked Questions
What is the best hydraulic driven self-priming pump?
The best hydraulic driven self-priming pump is the one that matches your hydraulic motor and your water. For muddy, sandy, or silty water, the Franklin FMIH-40 is a good fit, since it passes solids up to 10% by volume and has a replaceable wear plate. It mounts to a hydraulic motor with an SAE B mount and a 7/8 inch spline. Send us your oil flow, pressure, and water needs, and we will confirm the fit.
How do I choose the right hydraulic motor for a water pump?
To choose the right hydraulic motor for a water pump, match the mount, the shaft, the oil flow, and the rotation. For the FMIH-40, the motor needs an SAE B mount and a 7/8 inch splined shaft. Its oil flow must suit your tractor's auxiliary circuit, because oil flow sets motor speed and pump output. Too much flow can overspeed the motor and pump. The motor must also turn in the direction marked on the pump case.
Should I use a hydraulic submersible pump or a hydraulic self-priming pump?
Use a hydraulic submersible pump when you can drop the pump into the water, and a hydraulic self-priming pump when it must sit on dry ground. A submersible has no suction lift to manage. A self-priming pump like the FMIH-40 stays on the bank or the truck, lifts water up its suction hose, and is easier to reach for service. The FMIH-40 also passes mud, sand, and silt up to 10% by volume, which suits ponds and dewatering pits.
Ready to order? Send us your hydraulic motor details and the water flow you need, and we will confirm the FMIH-40 setup before it ships.