Gear Pump

Product Parameters

Part Number	705-52-42220
Type	Fixed-displacement external gear pump
Application	– Koma-tsu PC1250-7, PC1100-6 excavators – WA600-8 wheel loaders
Displacement	26 cm³/rev (1.59 in³/rev)
Rated Pressure	180 bar (2,610 PSI)
Max Pressure	220 bar (3,190 PSI)
Rated Speed	1,800-2,000 RPM
Rated Flow	~47 L/min (12.4 GPM) @ 1,800 RPM, ISO VG 46 oil (50°C)
Gear Material	Case-hardened alloy steel (HRC 58-62)
Pump Body Material	Cast iron (FC250) or aluminum alloy (ADC12)
Port Connections	– Inlet: SAE 10 flange (3/4″-16 UNF) – Outlet: SAE 8 flange (1/2″-20 UNF)
Rotation	Clockwise (CW) or counterclockwise (CCW) (shaft keyway-dependent)
Mounting Flange	SAE J744-C (4-bolt, 127 mm diameter, M10 threads)
Weight	~12 kg (cast iron) / ~8 kg (aluminum)
Volumetric Efficiency	≥93% @ rated pressure
Temperature Range	– Ambient: -20°C to +80°C – Oil: -10°C to +110°C
Filtration Requirement	ISO 4406: 18/16/13 (≤25 μm particles)