anyone know where there is a hydraulic schematic for a ex60-1 excavator?

Question

i need to know where there is a diagram for this curcit so mi can work out what is going wrong!

i have looked everywhere and cannot find anything, can enybody help?

Answer 1

check the manufactures technical service. Get on-line

Answer 2

The earlist EX60 had a 3 bank fixed displacement gear pump followed by a twin variable displacement axial piston pumps with gear pilot pump,latest is a treble flow with a gear pilot pump,the solenoids are not fitted to the pump but are mounted remotely near the pilot circuit filter by the counter weight,if you have a variable flow pump and wants to know if the solenoids are operating sit someone else in the seat and hold the thin pipes coming off the pump to the solenoids,you can feel the oil pulse if the solenoids open when a load comes on the equipment,in the case of this machine working ok till it gets hot points to the pilot pump been worn and not having enough pressure when hot,the oil coming from the swing gearbox I would say is an unrelated problem and I have changed many a seal on the motor output shaft,the machine has a leak return that come from the track motors through the rotary coupling via the swing motor to the tank,as it goes into the tank it has to pass through the filter,keep the filter changed,the tank also has a pressure valve in the cap and a filter that should not be blocked or too much pressure will build up and restrict the flow of low pressure oil returning to the tank,my advice to you is have someone look at your machine that can test the pressure of the main and pilot system.what model,how old is it.
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