GRACO 558951 – Trabon Meter-Flo Electric Gear Pump, 168 cu in/min @ 1725 rpm, NPT Ports, CW

GRACO 558951 – Trabon Meter-Flo Electric Gear Pump, 168 cu in/min (2753 cc/min) @ 1725 rpm, NPT Ports, CW

GRACO 558951 is a Trabon Meter-Flo electric gear pump that delivers 168 cu in/min (2753 cc/min) at 1725 rpm (or 111 cu in/min at 1140 rpm) through 1/2″ NPT ports, rotating clockwise (CW) when facing the pump shaft. With its solid cast-iron housing, these rugged gear pumps are designed for dependable operation in high-demand industrial lubrication applications and are driven by a direct-coupled 1/2 HP motor.

Direct-drive and smooth-running, the Meter-Flo is ideal for applications requiring continuous delivery of hydraulic or lube oils to series-progressive metering systems.

Continuous oil delivery for systems with up to 1,000 lubrication points

Positive displacement assures constant delivery of the proper volume

Match-ground, heat-treated steel gears enclosed in a rigid cast-iron housing assure dependability and long life

Standard SAE 4-bolt mounting simplifies installation

Adjustable internal pressure relief valve (factory-set at 1000 psi, adjustable 300–1500 psi) protects against overload conditions

Special coupling allows easy replacement of older Meter-Flo pumps using the same mounting brackets

Specifications

Type	Electric Gear Pump
Power Type	Electric
Rotation	CW (facing shaft)
Application	In-Plant Machinery
Compatible Material	Hydraulic / Lube Oil
Compatible Metering Device	Series Progressive
Output @ 1725 rpm	168 cu in/min (2753 cc/min)
Output @ 1140 rpm	111 cu in/min (1819 cc/min)
Motor	1/2 HP, direct-drive
Fluid Outlet Size	1/2″ (12.7 mm)
Fluid Outlet Thread Type	NPT
Maximum Working Pressure	1500 psi (103 bar, 10.3 MPa)
Relief Valve Range	300–1500 psi (21–104 bar), factory-set @ 1000 psi
Operating Temperature	50°F to 150°F (10°C to 66°C)
Recommended Oil Viscosity	350–2900 SUS (76–627 cSt)
Seal Material	Buna-N
Net Weight	5 to 6-1/2 lbs (2.26 to 2.95 kg)
Old Part Number	540-800-071 (NPT)

Repair Kits

557997 – Seal Kit (Buna-N)

557998 – Relief Valve Repair Kit

563303 – Special Coupling Assembly

Reference Manual

L12611 – Trabon Meter-Flo Pumps Flyer