A: The case drain vents normal internal bypass oil. Connecting it directly keeps internal case pressure low, preventing the high-pressure shaft seal from blowing out.
Q: How do we fix a swing motor that hesitates when rotating in only one direction?
A: This issue is usually caused by a stuck internal relief valve spool. Remove and clean the valve assembly, then check for smooth movement to fix the rotation.
Q: Are the internal pistons and cylinder blocks sold as a pre-matched assembly?
A: Yes, our piston groups are factory-lapped together. This precise matching ensures high volumetric efficiency and prevents early pressure loss.
Q: Can this motor operate reliably using eco-friendly biodegradable hydraulic fluids?
A: Our standard sealing materials are compatible with most synthetic and mineral oils, including common biodegradable hydraulic fluids.






















