shop Bulldozer D41A-6 Hydraulic Gear Oil Pump 705-52-21070 for Komatsu Excavator Piston Hydraulic Main Pump Parts 7055221070_Excavator Hydraulics, Diesel Engine, SKS Hydraulic

Bulldozers: D41A-6, D50A-2/-3 (auxiliary pump).

Excavators: PC120-6, PC200-6 (as a pilot pump for main piston pumps).

Driven Systems:

Pilot control valves for precise blade/ripper positioning.

Lubrication of transmission components in bulldozers.

Oil cooling circuits in excavator hydraulic systems.

Installation & Maintenance

Installation Notes:

Ensure a tight seal on inlet/outlet ports to prevent air ingestion (vacuum pressure ≤0.3 bar).

Align the drive shaft with ≤0.1 mm radial and ≤0.2° angular misalignment.

Maintenance Tips:

Filtration: Use a 25-micron suction filter and 10-micron return filter.

Oil Contamination: Monitor for metal particles (indicates gear wear) using a magnetic drain plug.

Oil Viscosity: Cold-start viscosity should not exceed 1,000 cSt to avoid pump cavitation.