I have just acquired a 1990 model 743 Bobcat skid steer. Currently the machine has the hydraulic pump and engine removed. The hour meter reads just over 2000 hrs (if it was working still). I need to put the engine and hydraulic pump back into the machine. I was informed by previous owner that the hydraulic pump was just rebuilt/serviced and should be in good shape. The previous owner was having issues with the pump leaking and had the seals replaced and the pump serviced. The previous owner suspects the Universal Joint is bad and need to be replaced and was causing too much vibration, thus causing the pump to leak. I am looking for suggestions on what service/maintenance the engine might need before reinstalling. Should I inspect/replace the injectors? Should I inspect/replace the glow plugs? Should I inspect/replace something else? The previous owner said the entire unit ran fine before disassembly. Thanks for your help.