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Cast iron rotary gear pump head, 1/4 inch ports, 1/3 HP motor rating

Dayton

Dayton 4KHR1 Rotary Gear Pump Head 1/3 HP 1/4 in port 2.2 GPM

SKU CH-0BJE-3WW31 MPN 4KHR1

Rotary gear pump head delivers 2.2 GPM freeflow at 725 RPM with 100 psi maximum pressure and -20 to 210 degrees F operating range

  • Product typeDrain Components
  • Delivers 2.2 GPM free-flow for efficient fluid transfer
  • Operates at 725 RPM with 1/3 HP motor for reliable performance
  • Handles up to 100 psi pressure for demanding applications
  • Functions from -20 to 210 degrees F across varied environments
  • Cast iron body with steel spur gears ensures durability

Rotary Gear Pump Head 1/3 HP

The Dayton 4KHR1 is a cast-iron rotary gear pump head designed for intermediate-duty fluid transfer. It suits maintenance technicians and OEM integrators who need a compact, close-coupled unit for lubricating oils or similar liquids within the stated viscosity range.

Thermals noise and power draw

The pump head operates from -20 to 210 degrees F with a mechanical carbon/ceramic seal and Viton O-rings. A 1/3 hp motor running at 1,725 RPM drives the steel spur gears to deliver 2.2 GPM free-flow at 100 psi maximum pressure. The relief valve protects the system during normal pressure spikes.

Sustained load behavior

Under continuous operation the cast-iron body and steel gears maintain steady flow up to 550 SUS viscosity. The integrated relief valve prevents over-pressure during extended runs while the Viton seals resist thermal cycling. The 1/4-inch ports and 0.5-inch shaft ensure consistent coupling alignment throughout the duty cycle.

How it compares

Measured against everything we stock in Drain Stoppers, Strainers & Traps, at today’s prices. Recalculated every night.

Price $179.99
Pricier than about 83% of the 4,240 comparable items (median $31.99).

Specifications

Product
Brand nameDayton
Model name4KHR1
Product typeDrain Components

Questions about this item

How do I mount the 1/3 HP rotary gear pump head and what step is often missed?

Close-couple the pump head to a carbonator-frame motor using the .5 in steel shaft; the step often missed is verifying shaft alignment before tightening the coupling to prevent premature seal wear.

Which parts will need replacement after extended use on this pump head?

The mechanical seal (carbon/ceramic with Viton) and the Viton O-rings are the primary wear items; inspect them during routine maintenance and replace if leakage or reduced flow appears.

What is the first limit reached during continuous operation of this 2.2 GPM pump head?

The 100 psi maximum pressure rating is typically the first limit encountered under sustained use; the integral relief valve will open to protect the cast iron body and steel spur gears.

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