Champion 710A no hydraulics after parking.

James Sorochan · Dec 13, 2021

Is there a test port somewhere up by the valve body to put a gauge on?

DB2 · Dec 13, 2021

HATCHEQUIP said:
your shaft coming off the engine goes into gearbox that turns pumps correct ? are the pumps turning ?

The later ones did away with the gearbox and just had a straight shaft driving a double pump.

DB2 · Dec 13, 2021

James Sorochan said:
Is there a test port somewhere up by the valve body to put a gauge on?

Not certain on a 710 but you could try cracking one of the pressure lines at the pump and see if it’s moving any oil at all.

James Sorochan · Dec 13, 2021

I cracked the small top one on the right side and had oil flowing but I suppose I should have had someone in the cab turning the wheels to see if it started to spray with somme intensity. Just thinking out loud here.

cuttin edge · Dec 13, 2021

And when you say no hydraulics, that's wheel lean, side shift, rotate, MB tilt, all that stuff. My old 730 had a belt driven pump as well, no idea what it did.

James Sorochan · Dec 13, 2021

Yes. Thats correct.

cuttin edge · Dec 13, 2021

James Sorochan said:
Yes. Thats correct.

Our 730 lost wheel lean, but it was an issue with the valve body under the cab, it would never affect everything. Find the line that supplies the main valve. Not sure if yours is in behind the stump guard, or on the goose neck. Ours had debris in the out going line. but you could hear the pump trying to lean the wheels, but it was blocked.

James Sorochan · Dec 13, 2021

Ok, thanks cutting edge. When I operate the controls I don't hear the pump at all and can't feel any pilot pressure feeding back to my hands. Not sure if one should feel pilot pressure. I have not run graders before.

DB2 · Dec 13, 2021

These do not have pilot controls. Straight cable actuated valve spools.

James Sorochan · Dec 13, 2021

OK. Do you have a drawing of the valve block test ports to show where one can check the pressures?

James Sorochan · Dec 13, 2021

I guess I should get of my butt and see if I can put some new dents and cuts in the top of my head trying to see up in there. I'll get back and report a little later.

cuttin edge · Dec 13, 2021

James Sorochan said:
I guess I should get of my butt and see if I can put some new dents and cuts in the top of my head trying to see up in there. I'll get back and report a little later.

The controls in your hand operate the functions via cable. There is no pilot system, but there should be a pressure supply line from the pump to the valve bank. My issue was from the valve for the wheel lean to the front axle. A piece of the hose it self came off and blocked the line.. I have no knowledge of test ports, but if you knew where the supply line is for the vb, you could crack it. It should be quite a spray..

James Sorochan · Dec 13, 2021

I cracked a couple of what I think are the feed lines from pump and didn't get any spray. I picked up the front end of the grader with excavator and backed up to shop and got the pressure washer going. It was dark by the time I finished cleaning the back end of machine. The weather is going to get colder for the next 5-6 days. I don't have a shop to put machine in so I may run out of time to work on it. We will see.

Fatgraderman · Dec 14, 2021

So on the first 730 I ran, roughly 1990, and I’ve forgotten the serial #, my understanding was that it had a double sided pump under the rad for steering, brakes, and transmission. And the hydraulic pump was off the bellhousing. Somewhere along the line Champion switched stuff around to run the hydraulics straight off of the crankshaft and moved the transmission pump to the bellhousing. Twisted off accessory drive maybe?

Welder Dave · Dec 14, 2021

Sounds like either the pump isn't turning or there is a large leak on the suction line. You should be able to determine if the pump is turning just buy putting your hand on it with the engine running. If it is turning, then the problem is either suction related or the pump packed it in. If the line directly off the pump doesn't have flow then check if something might be blocking the suction or the suction line is bad. Not sure but could a lever for (aux.) Hyd's accidentily been engaged and it's taking all the flow? I only say this because on a skid steer it can happen but the machine is much harder to start under load.

DB2 · Dec 14, 2021

I guess another thought is something could be stuck in the relief valve holding it open.

Vetech63 · Dec 14, 2021

From the amount of wet gunk under that pump im thinking suction leaks

James Sorochan · Dec 14, 2021

I couldn’t reconcile what I was reading in the service manual on the Sierra park site and what I was seeing on the machine. I crawled all over and under the machine and everything was telling me the back pump was for tranny and steering and the pump off the auxiliary had to be the implement. While the machine was running I cracked open the auxiliary fitting and oil started to come out. The engine pulled down as the pump finally loaded up with oil. I jumped into the cab and everything started to work again. Boy that sure felt Good!

DB2 · Dec 14, 2021

Lost it’s prime. Glad you found your problem.

Vetech63 · Dec 15, 2021

James Sorochan said:
I couldn’t reconcile what I was reading in the service manual on the Sierra park site and what I was seeing on the machine. I crawled all over and under the machine and everything was telling me the back pump was for tranny and steering and the pump off the auxiliary had to be the implement. While the machine was running I cracked open the auxiliary fitting and oil started to come out. The engine pulled down as the pump finally loaded up with oil. I jumped into the cab and everything started to work again. Boy that sure felt Good!

Good deal!.......but fix that suction leak or it will do it again. The hydraulics may be a bit jerky if the pump is pulling air into the system from the suction side.

Champion 710A no hydraulics after parking.

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