K5V200DTH DH500 Hydraulic Gear Pump PC200 Excavator for Compatible OEM Spare Parts Main Pump Assembly

K5V200DTH DH500 Hydraulic Gear Pump PC200 Excavator for Compatible OEM Spare Parts Main Pump Assembly

Functions
Excavator main hydraulic pump is the hydraulic power heart powered by engine, turning mechanical power into high-pressure oil to run boom, arm, bucket, travel and swing motors.
Pump Types
Axial variable piston pump is widely fitted on excavators; mid & big excavators use dual combined pump with back-mounted pilot pump: main pump 28~35MPa, pilot pump 3~4MPa for pilot handle control.
Inside Structure
Rotating pistons inside cylinder block build oil pressure; adjustable swash plate controls pump flow; side regulator changes swash angle to adjust speed and fuel cost; valve plate separates oil inlet and high-pressure outlet.
Three Smart Controls
Constant power prevents engine stall on heavy load; LS saves fuel by supplying needed oil only; pressure cut-off protects hydraulic parts when pressure hits limit.
Common Issues
Leaking inner parts or stuck regulator = slow machine; fixed big displacement = overload & black smoke; serious leakage = hot hydraulic oil; air in pipe / low oil = strange pump noise.
Maintenance Guide
Swap oil and filters regularly, block air from suction tube and keep oil at normal height to prolong pump service life.

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