When sourcing an excavator, how do I verify hydraulic pump flow matches engine power?
• Check pump displacement cc/rev and engine rated rpm to calculate theoretical flow L/min.
• Total main pump power ≤ engine rated power × 0.85 to reserve hydraulic losses.
• Require the supplier's pump-engine power matching curve for verification.
• If pump flow is oversized, idle movement is slow and fuel consumption high; reduce displacement.
• Field test: engine droop should be ≤10% at bucket relief.
• Total main pump power ≤ engine rated power × 0.85 to reserve hydraulic losses.
• Require the supplier's pump-engine power matching curve for verification.
• If pump flow is oversized, idle movement is slow and fuel consumption high; reduce displacement.
• Field test: engine droop should be ≤10% at bucket relief.