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volvo ec390 bucket function does not build mains pressure all…

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volvo ec390 bucket function does...
volvo ec390 bucket function does not build mains pressure all other functions good bucket activate completely with no load ideas on problem checked hydraulic ram for bypass good main spool seems to operate well control pressure is correct it is as if a valve is bypassing in the circuit
Submitted: 10 years ago.Category: Construction and Road Equipment
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Answered in 7 hours by:
4/8/2012
Mechanic: dieseldan55, Mechanic replied 10 years ago
dieseldan55
dieseldan55, Mechanic
Category: Construction and Road Equipment
Satisfied Customers: 794
Experience: Road Mechanic for Volvo Construction Equipment.
Verified

Hello, this is an Ackerman excavator correct? Just want to make sure of the model and serial number. Can you tell me what your pressure readings are for pilot and main relief when you checked them. Sounds like you made all the right checks already, however did you also swap out the relief valves with a good circuit to see if that would make a difference? Please advise, Dan

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Mechanic: dieseldan55, Mechanic replied 10 years ago

Here is some information on the circuit's for your machine. Pump adjustment procedures as P-1 an P-3 both supply oil to the bucket circuit. Maybe one of the pumps is faulty. However my first thought is still to swap out the circuit reliefs with another circuit. The arm circuit is right there so use those and see if the pressure changes. If not and your pressure checks on the pumps are correct, Then isolate the cylinder by blocking the lines to see if the pressure changes. Thanks, Dan

 

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dieseldan55
dieseldan55, Mechanic
Category: Construction and Road Equipment
Satisfied Customers: 794
Experience: Road Mechanic for Volvo Construction Equipment.
Verified
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Customer reply replied 10 years ago
Ichanged the circuit relief with another valve.Machine is opperating properly in all functions.Thanks for your help Martin
Mechanic: dieseldan55, Mechanic replied 10 years ago
Glad to be able to help, i you have time please leave feedback on your experience with the site. Thanks Dan
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