AC 715B steering issues

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   Recently bought a 715B (I think)  The plate also shows 715D just below the 715B.  Steering works great for a while, then starts to feel like it is slipping, then stops steering all together.  Can continuously turn steering wheel with no movement at the wheels.  Previous owner replaced the orbital valve and thinks that he had the steering cylinder rebuilt.  I have been trying to locate the priority valve.  I think it may have been removed before the previous owner purchased it.  Where should I find the priority valve on the backhoe?  Is it possible to properly operate without it since there is a separate steering pump?  Thanks

Edited by Specialized37 - 30 Jul 2025 at 6:40am

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Specialized37 Members Profile Send Private Message Find Members Posts Add to Buddy List Bronze Level Joined: 29 Jul 2025 Location: Tennessee Points: 2	Post Options Post Reply Quote Specialized37 Report Post Thanks(0) Quote Reply Topic: AC 715B steering issues Posted: 29 Jul 2025 at 7:58pm
	Recently bought a 715B (I think) The plate also shows 715D just below the 715B. Steering works great for a while, then starts to feel like it is slipping, then stops steering all together. Can continuously turn steering wheel with no movement at the wheels. Previous owner replaced the orbital valve and thinks that he had the steering cylinder rebuilt. I have been trying to locate the priority valve. I think it may have been removed before the previous owner purchased it. Where should I find the priority valve on the backhoe? Is it possible to properly operate without it since there is a separate steering pump? Thanks Edited by Specialized37 - 30 Jul 2025 at 6:40am

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Coke-in-MN Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 12 Sep 2009 Location: Afton MN Points: 41962	Post Options Post Reply Quote Coke-in-MN Report Post Thanks(0) Quote Reply Posted: 3 hours 21 minutes ago at 12:44am
	Seems my 715 B/D is having steering quirks also - when road driving machine turning when to correct travel it will make a complete revolution of the wheel in a short time . Figure it has to be leakage in the cylinder but on job one can turn wheel and lock wheels in turn position The wandering on steering has been there since I bought the machine back in 87 or 88 with 2000 hours on it . I have rebuilt all the hydraulic cylinders except the on on front axle . I have a Digmore extend a hoe on rear
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