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#1
10-11-2010, 08:45 PM
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manual release valves
Guys,
How do I know when I need to replace the hydro release valves? They are manual type. Do they pop up when the motor is running? OR, do they release when the lever is pulled and automatically pop back up? Can they be cleaned and serviced? thanks jeff
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'72 108 w/ 38" HIGH speed deck, '77 1200QL w/ homemade grader blade, '79 1450 44" grass tamer, '70 sears super 12 w/ 3pt , 19?? 100 w/ extra toys, 69' economy powerking 14 horse w/ FEL, 65' economy powerking w/ toys, 1982 allis chalmers 716 Jeff 
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#2
10-11-2010, 08:59 PM
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My experience with them has been checkered I pushed the poppet down and it released the pressure as advertised BUT the poppet did not pop back up needless to say I had to remove the valve clean it the best I could heat the poppet until it worked free and it works normally.
I will use that feature with care, I am a cheapskate, and didn't want to spend the cash on something I may never use again so I tried the clean and lube it worked for me but your mileage may vary. Operation: they stay up for me the transmission works as advertised push them in the pump pressure is not send to the transmission and you can move the tractor freely You can get new ones click on the link http://www.onlycubcadets.net/forum/showthread.php?t=3
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#3
10-12-2010, 09:14 PM
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Actually the best thing would be to cycle the valves so they would not stick... once a year would probably solve all of these problems, at oil change or so so you could do a general maintenance. I will link to some websites below, and my battle with the check valves, I ended up purchasing a used set which one was stuck, I did repair one successful, however I have a lathe so keep that in mind, and it was a huge help. If these valves had been made to disassemble there would never be an issue with the valves at all, they are that easy to fix once you get them apart.. but you have to get them back together with good workmanship, and no worries about holding !!
If I were to do it again instead of tacking with a welder/brazing I think it might be better to cut them using the lathe, then leave a small shoulder to press them back together using epoxy for a mind ease.. and max press fit tolerance. On edit if your hydraulic check valves are failing/collapsing when the engine is cut off I think you have either weak or broken springs inside, they should hold up by them self as the spring is pretty stout. http://cubfaq.com/relief1.html http://onlycubcadets.net/forum/showthread.php?t=473
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#4
10-13-2010, 04:43 PM
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i took them out and thoroughly cleaned them. i sprayed PB blaster in the little nibs and worked them in and out for a while. now they spring back push after push. i put them back in the tractor for a more accurate trial and they work perfect. in fact they work so well that i'm gonna offer my buddys' $50 back on the tractor!!!!! and tinker with it!!! thanks! jeff
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'72 108 w/ 38" HIGH speed deck, '77 1200QL w/ homemade grader blade, '79 1450 44" grass tamer, '70 sears super 12 w/ 3pt , 19?? 100 w/ extra toys, 69' economy powerking 14 horse w/ FEL, 65' economy powerking w/ toys, 1982 allis chalmers 716 Jeff
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#5
10-13-2010, 06:23 PM
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clint, nice job on the valve repair, and pics. i'm doing my hydro now and my valves are a little stuck. i'm going to try some pb first ovrnite. i wish i had more big boy shop tools. i've had the experience, but no toys. way back when i was in the navy we learned how to weld first, then salute. hats off to your project.
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#6
10-13-2010, 06:40 PM
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Congrats on fixing the valves. I love that feeling of accomplishment when a plan comes together.
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DWayne 1973: 128, ag tires, 3pt. lift, spring assist, lights, 42" Deck 10" moldboard plow 2016 XT1 42" deck 18HP
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Cub Cadet is a premium line of outdoor power equipment, established in 1961 as part of International Harvester. During the 1960s, IH initiated an entirely new line of lawn and garden equipment aimed at the owners rural homes with large yards and private gardens. There were a wide variety of Cub Cadet branded and after-market attachments available; including mowers, blades, snow blowers, front loaders, plows, carts, etc. Cub Cadet advertising at that time harped on their thorough testing by "boys - acknowledged by many as the world's worst destructive force!". Cub Cadets became known for their dependability and rugged construction.
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