Back with a new problem. No idea about this new problem. Skid steer starts and builds charge pressure. Tilt works. Lift works. Forward and reverse work. After about 2 or 3 minutes of idling with good charge pressure the hydrostatic starts growling loud. I noticed that the tilt pedal is stuck. Once I shut the engine off the tilt pedal is still stuck. I pulled off the control valves and didn't see anything out of place. Any ideas are appreciated.
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antfarmer2
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Get in there and free up your tilt pedal get all the crap out and lube it up
I took apart the control valve and didnt find anything. The tilt pedal slowly engages over time until its fully engaged.
discountufoparts
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- Sep 7, 2011
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If the tilt pedal slowly engages over time on its own I would check into the centering springs on the valve bank and maybe the load check valves if it has those.
The drive noise could be a plugged suction line filter. No tsure if this model has one or not, but other models have a square block on the hydraulic pump, there is a hidden filter behind the middle fitting on the left side.
I had a 731 that worked great for 20 or so minutes then growled and had no power, gave the filter a good clean with solvent and the machine never looked back.
I don't think this model has a filter. I guess to test my theory that the tilt is engaging on its own, I'll put them in the fully extended position and see if they tilt back on their own over time. If they tilt on their own then something is moving the spool?
Or maybe there is a weak spring in the load check or something holding the check valve open?
Update. I started the skid steer and lowered the tilt halfway. It ran with no issues. Sat there idling along. Lift worked fine. It turns out that the tilt will creep up over time. To tilt down, the pedal is very hard. To tilt up the pedal is easier than down, but still takes some pressure. Before starting the engine the pedal works smooth. No excess pressure needed. So something is causing the valve to bind.
flyerdan
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It almost sounds like pressure might be backing up through the power beyond, check that the aux hydraulic pedal isn't engaged a bit. Even though it's the center pedal, it controls the valve on the far right of the block. If everything seems good to a quick look, maybe hook up something to the aux ports and see if it starts on it's own, or make up a loop hose to close the circuit for testing. If the aux circuit is dead heading, it will make it's displeasure known by groans and squeals; if the relief valve isn't working properly it could possibly break something.
kilohertz
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- Feb 12, 2012
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Yup, there are 2 hydraulic filters on this machine..I have the 720, same machine but Wisconsin instead of Ford engine. There is a 10u filter under the ROPS, easy to see once the canopy is up, and there is a main 25u filter, under the engine pan, in front of the engine. You have to drop the rear skid plate under the engine to get at it. That is the main filter where fluid leaves the hydrualic resevoir. The 10u looks after stuff within the hydraulic cct. Change 'em both. Cheap insurance. My pedals are all sloppy and loose, but always come back to center. Do you have an aux. lever on the left side, right behind the brake lever? If I pull on that it sometimes sticks off center. There is also the center pedal which can be locked toe down, for operating AUX equipment.
Good luck!
Keep us posted.
Cheers
Atilathehun99
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- Dec 17, 2011
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Chandler your problem is a bit different from what I'm experienced, but close. The difference between yours and mine was that with mine with mine it didn't take a couple of minutes or normal pedal use for the problem to surface. With mine on my 722 the tilt and/or lift pedals locked up or were non-responsive, but only when it was below freezing temps. I took the whole pedal assembly apart and de-scaled the rust, shined the pedal rod up and replaced the grease zerks so they would take grease. Problem solved.
Back with more information. I start the engine and charge pressure goes up almost right away. Auxiliary pedal and lift pedal move forward and backwards through their full range of motion. Neither is sticking. Tilt will creep up until the pedal sticks. So I turn off the engine. Still have charge pressure. It slowly comes down. It takes about 4 minutes to reach zero pressure. Tilt pedal can not be pressed with the ball of the foot. Pressing with heel works. The tilt pedal will return to neutral after pressing with heel. What about load check valves? Would a stuck valve cause this?
Is it possible that too small of an o-ring (number 12 in the image) would cause leakage past the spool valve? The original o-ring was split so I put a new one in. I didn't buy an OEM o-ring, just got one from my collection. Im thinking the o-ring may be too small, fluid gets past it and the pressure pushes the spool valve forward. After a period of time the pressure will bleed off and the pedal will function as normal. That's my theory
