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The 4126A Series™ internal gear pump is the most versatile line of internal gear pumps due to the availability of many design and other options. It can handle a broad range of viscosities with constant flow rate up to 500 GPM (114 m³/h).
Features & Benefits
- Positive displacement internal gear pumping principle handles a broad range of viscosities with constant flow rate
- Axial rotor thrust is controlled by double row ball bearing or tapered roller bearings; a bushing provides a secondary point of radial shaft support
- Rotatable bearing housing provides easy rotor end clearance adjustment for viscosity or to compensate wear
Videos
Refined Fuels
Refined fuels would include petroleum based fuel oils and some Jet Fuels. Their viscosity and temperature handled can vary greatly. Normally these are handled in bulk transfer operations.
Biofuels
Biofuels include Biodiesel and Ethanol. These are fuels made from renewable resources and typically blended with refined fuels as additives.
Glycol (Ethylene Glycol, Ethylene Alcohol)
A clear, colorless, syrupy liquid used in a variety of applications involving lacquers, resins, printing inks, adhesives, waxes, and pharmaceuticals. It is often blended with water and used as a coolant and anti-freezing agent.
Technical Service Manuals
Catalog Sections
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REPAIR RESOURCES
Exploded Diagram for Series 123A/4123A - 124A/ 4124A - 126A/4126A - 127A/4127A … 
Quick Tip #01 - Setting End Clearance on a Viking Pump Universal Seal Pump 
How to Use a Thrust Bearing Locknut Tool
Viking Pump Universal Seal Series with Stuffing Box Component Seals Repair Kit Installation
Quick Tip #02 - Install Mechanical Seal into Stuffing Box in Viking Pump Universal Seal Pump
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DRAWINGS
H-HL with Plain Head - 1.5" NPT RH/LH
PDF
H-HL with Relief Valve - 1.5" NPT RH/LH
PDF
H-HL with RV and ProPort Casing - DIN 40 PN16 Opposite
PDF
K-KK with Plain Head - 2" Class 150 RH/LH
PDF
K-KK with Plain Head - 2" NPT RH/LH
PDF
K-KK with Relief Valve - 2" Class 150 RH/LH
PDF
K-KK with Relief Valve - 2" NPT RH/LH
PDF
L with Plain Head - 2" NPT RH
PDF
L with Relief Valve - 2" NPT RH
PDF
LL with Plain Head - 3" Class 125 ANSI RH/LH
PDF
LL with Relief Valve - 3" Class 125 ANSI RH
PDF
LQ with Plain Head - 2.5" Class 125 ANSI RH/LH
PDF
LQ with Relief Valve - 2.5" Class 125 ANSI RH/LH
PDF
LS with Plain Head - 3" Class 125 ANSI RH/LH
PDF
LS with Relief Valve - 3" Class 125 ANSI RH
PDF
Q with Relief Valve - 4" Class 150 ANSI RH/LH with Studs and Bolts
PDF
QS with Plain Head - 4" Class 125 ANSI RH/LH
PDF
QS with Plain Head - 6" Class 125 ANSI Opposite
PDF
QS with Relief Valve - 6" Class 150 ANSI Opposite
PDF
QS with Relief Valve - 6" Class 150 ANSI RH
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