A: Internal wear in the PVD-1B-32 pump causes oil to slip past seals when it thins out.
A: Ensure the main suction hose is free of kinks so the pump gets enough oil.
A: Yes, part number 4605638 is designed to replace factory units in both excavator series.
A: Yes, it operates safely down to -20°C when using standard low-temperature hydraulic fluid.






















