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foaming 620 power steering

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G Taylor

10-27-2000 15:14:05




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Any common classic reason a 620 foams power steering oil out the breather when steering is used regularly.Heard of others prone to the same. Have all the manuals from Deere. In the area anyways doing the rad and waterpump. Was going to freshen up PS pump and look for leaks allowing air to be sucked into the intake side of pump for a 1st attempt. Changing/flushing oil to Hy-Guard made no difference. Stuff works fine in other two cylinders with PS.

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Don

11-03-2000 07:51:13




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 Re: foaming 620 power steering in reply to G Taylor, 10-27-2000 15:14:05  
The steering pump needs overhauled. the pump shaft seals are worn out and/or the pump shaft is worn out . these seals will let the pump suck air and it will foam out the vent , I've overhauled many of these pumpsfor this prob. . Might as well do the steering cyls. seals while you are at it. Also pay the price for the JD oil, its well worth it. hope this is not to late to help. Don



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DP

10-27-2000 21:04:58




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 Re: foaming 620 power steering in reply to G Taylor, 10-27-2000 15:14:05  
Are you having to add oil to the system? If so, check your engine oil level. I have seen the rear seal go bad in the pump and the oil will run down the fan shaft tube to the governor housing, and on into the crankcase.What happens then on startup is there is air in the pump, and it will cause the system to foam out the vent untill the foam settles down. If the radiator hasn't been replaced with a 5 tube core, you can get the pump off without removing the radiator. Good luck! Don

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G Taylor

10-28-2000 06:39:28




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 Re: Re: foaming 620 power steering in reply to DP, 10-27-2000 21:04:58  
It only foams out the ps filler cap when using the steering. Drove it home on the road for hours without foaming but a few turns on the steering wheel while turning corners makes the foam froth out. The former owner had taped a line into the fill cap and down to a catch can behind the water pump rather than repair the problem. Another "fix" on the tractor is a 3/4 vent line monkeyed into the "Y" casting between the aircleaner and carb.The vent line then connects to customized oil fill nipple at the pulley??? Must be some kind of blowby situation. Will be getting into system in a few weeks when other time demands allow. Bought the thing sight unseen for a very reasonable price so I can't complain. Should see the " special custom" float ride seat grafted on it.

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clooney

10-28-2000 08:01:01




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 Re: Re: Re: foaming 620 power steering in reply to G Taylor, 10-28-2000 06:39:28  
G Taylor, about the only things that will cause foaming is the wrong type of oil, mixed oil or an air leak. When going straight ahead most of the oil is by-passed back to the reservoir & not doing any work so if there is air in the pedestal it could stay there until the wheel is turned. You might want to check for vane seal leakage in the pedestal by removing the front grille assy. then disconnect the front line on the steering valve, then pivot it down & to the front so it is pointing down & out the front of the tractor, then re-tighten the lower fitting on the line, then place a catch can under the line, then start tractor & run at fast idle & turn to the extreme right & hold & see how much oil leaks out (leakage should not exceed 1qt in 1/2 minute) also check for air in the oil. You might try putting some light oil on all the intake fittings one at a time & see if you can see oil being drawn into the system. John Deere doesn't recommended flushing the system because of the difficulty of getting the flushing agent out so maybe you still have mismatched oil in the system from the previous fill(s). To drain the system the wheel will have to be turned to the left then the reservoir drain plug removed & let oil drain out, then the front oil line will have to be removed from the control valve & pivoted down & forward then the wheel will have to be turned to the right. I have never tried this but you might try to make a fitting to go into the reservoir cap & put a party balloon on the fitting then put air pressure in the fitting to inflate the balloon to keep steady (but low) pressure on the system to check for leaks. Caution: don't put direct air pressure on the system unless you have a good way to regulate it. Good luck & keep us posted on your progress

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clooney

10-27-2000 15:57:57




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 Re: foaming 620 power steering in reply to G Taylor, 10-27-2000 15:14:05  
G Taylor, suspect an air leak on the intake side of the system going to the pump allowing air to enter system (might only leak when suction is present) or pump seal that relaxes when parked allowing air into system. John Deere was quite demanding about using their P/S oil in the old days & I still use it as I have some left, so I can't comment on how Hy-Guard works but to me the old P/S oil seemed much thicker than Hy-Guard. I have seen foaming in touch-o-matics when different types of oil are mixed so maybe another flush is required. When you get it figured out re-post as I am curious to what you find.

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Jiff

10-27-2000 18:04:39




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 Re: Re: foaming 620 power steering in reply to clooney, 10-27-2000 15:57:57  
FYI, you can still get the JD 2 cylinder power steering fluid from John Deere at about $5 per quart.



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