SDLG (Shandong Lingong) heavy loaders and large excavators drive the cooling fan with a hydraulic gear unit, most often a Casappa KP-group external gear pump in the fan circuit. Gear-type fan drives are simple and durable, but they are not maintenance-free: internal leakage grows with wear, the fan stops reaching full speed at low engine rpm, and coolant and hydraulic oil temperatures creep up together.
This section covers replacement hydraulic fan drive pumps and motors for SDLG machinery, supplied new with mounting flange, shaft form and port layout matched to the unit being replaced. Send the model plate and photographs of the old part so we can match the displacement code and port orientation. Start with our fan motor diagnosis guide to confirm the fault, and see the full hydraulic fan motor range for other brands.