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catmastertech
catmastertech, Technician
Category: Construction and Road Equipment
Satisfied Customers: 2242
Experience:  Field service technician for CAT 19 years.
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On 416 cat backhoe to make power steering work have to raise

Customer Question

on 416 cat backhoe to make power steering work have to raise the loader, what is problem
Submitted: 1 year ago.
Category: Construction and Road Equipment
Expert:  catmastertech replied 1 year ago.

resolver seal failure is the root cause of this problem

Expert:  catmastertech replied 1 year ago.

You could also have trash in the priority valve located in the loader valve.

Expert:  catmastertech replied 1 year ago.

Your best option is to remove the loader valve and completely clean it and replace all the seals.

Expert:  catmastertech replied 1 year ago.

I would also recommend inspect your hydraulic tank and filter for debris to determine if you have a failure in the hydraulic system that may need more attention.

Customer: replied 1 year ago.
which resolver seal would it be
Expert:  catmastertech replied 1 year ago.

The loader valve has on in the inlet and each valve section. If they have not been replaced recently, I can promise you they all are bad. That is why I recommend re-sealing the whole valve. This also get you a chance to see if any damage is inside the valve that could indicate another failure.

Customer: replied 1 year ago.
the loader works fine, the problem is the power steering won't work unless you are raising the loader
Expert:  catmastertech replied 1 year ago.

You can start with the resolver in the inlet and move down the valve until you stop the problem.

This is the secondary resolver located in the of the valve and accessed through the holes in the side of the frame.

Remove the wheel to access these resolver seat.

Expert:  catmastertech replied 1 year ago.

This system is a network, the loader is activating the pump and starts the flow. The leak is either in the inlet section or the loader valve section.

Just be careful you don't loose the check ball when you remove the seat.

Expert:  catmastertech replied 1 year ago.

Here is a resolver location image. #2 is the back of the valve and is the one you should check.

Customer: replied 1 year ago.
where is loader valve located
Expert:  catmastertech replied 1 year ago.

below the loader control lever but to access the resolver check valve you need to remove the right rear wheel

Expert:  catmastertech replied 1 year ago.

four holes are in the frame and you need to start at the front section and reseal each check until you stop the problem.

Customer: replied 1 year ago.
thank you!
Expert:  catmastertech replied 1 year ago.

You're welcome.

If you need help again, please feel free to ask for me. I will be glad to help.

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