dont know a whole lot about the jd utility tractors so this is wy I am asking.80 year old neighbor has a 2640 with IPTO and with out a hi lo.He said pto quit while mowing so I ran over to look at it.checked pressure at pto and it is only 100 at 2000 rpm. I think it should be at least 140.All other hydraulics work like they should but if you have the gauge hooked up and pto on and move either one of the scv levers to move the loader the pto pressure goes up to 150 then back down to 100.I was wondering if pto disks get thin will that cause this? Or more like a internal leak? I would like to help the old man out so he doesnt get ripped off at dealer.Any thought on this let me know.I like to get some ideas before I tear something apart.I have done that in the past and I always find the problem but the more help before the teardown is beter.Thanks
- Thread starter dieseldoc
- Start date
buickanddeere
Well-known Member
Pull the trans oil screen and replace the filter. If they are full of clutch/brake fiber linings. Or worse metal. Somebody has likely poured a non-wet clutch oil into a wet clutch/brake tractor.
If so the tractor is pretty much wrecked or will require wheel brakes, pto clutch and pto brake. Plus scrubbing every little internal nook & cranny. Along with a thorough flushing.
How is the loader plumbed into the tractor? Unplug the loader hoses from the quick couplers and try the pto. It's possible there is a open center or a blown closed center loader control valve.
b.t.w. is the loader supply is mickey moused into the rear scv's. The loader will never work as it should. The loader control valve requires a direct feed T'd in to the high pressure line located near the brake cylinder. The loader return requires the use of a ported transmission oil filter cover.
Neither the T or the ported cover are expensive.
1-800-522-7448 to get the hydraulic specs etc.
If so the tractor is pretty much wrecked or will require wheel brakes, pto clutch and pto brake. Plus scrubbing every little internal nook & cranny. Along with a thorough flushing.
How is the loader plumbed into the tractor? Unplug the loader hoses from the quick couplers and try the pto. It's possible there is a open center or a blown closed center loader control valve.
b.t.w. is the loader supply is mickey moused into the rear scv's. The loader will never work as it should. The loader control valve requires a direct feed T'd in to the high pressure line located near the brake cylinder. The loader return requires the use of a ported transmission oil filter cover.
Neither the T or the ported cover are expensive.
1-800-522-7448 to get the hydraulic specs etc.
Does the hi-low still work OK? Hi-low gets it pressure oil from same place as the PTO.
If the PTO guit on him all-of-a-sudden, rather then slowly over time, I'd suspect an oil-pipe fell out. The entire 40 series was prone to this problem when equipped with the optional independent PTO and hi-low (or reverser).
When you pull the pot-metal cover off the top of the trans, there's a mess of steel pipes in there that plug into that cover. They carry oil from the transmission pump, to the PTO, etc. These steel pipes seal on both ends with a single o-ring. The 40 series had problems with those pipes vibrating and falling out. There were update kits to fix, but doubt all tractors got them.
PSI is supposed to be around 150 PSI, but 100 PSI ought to turn the PTO unless it's unhooked, or burnt out.
If the PTO guit on him all-of-a-sudden, rather then slowly over time, I'd suspect an oil-pipe fell out. The entire 40 series was prone to this problem when equipped with the optional independent PTO and hi-low (or reverser).
When you pull the pot-metal cover off the top of the trans, there's a mess of steel pipes in there that plug into that cover. They carry oil from the transmission pump, to the PTO, etc. These steel pipes seal on both ends with a single o-ring. The 40 series had problems with those pipes vibrating and falling out. There were update kits to fix, but doubt all tractors got them.
PSI is supposed to be around 150 PSI, but 100 PSI ought to turn the PTO unless it's unhooked, or burnt out.
Anonymous-0
Well-known Member
Stop! Maybe you're way ahead of me on this, but I'll quickly tell you my story with my 2240 (with ipto & hi-low). PTO generally is engaged using the small pull lever on top of the transmission box... But don't forget (as I did for few minutes) that there is a master gear engagement lever right behind your left leg. I knocked that lever while mowing, and mower quickly stopped... Oh &%@&!, how what? After getting ready to tear into the thing, I just happed to notice that I had unknowingly moved the lower pto system engagement lever. I moved that back, and all was well (and my heart started beating again). Experience tells me to check out that lever, before you touch a single bolt...
The loader is using the scvs. It does have a return to ported filter cover.He only uses hygard oil and filter and screen are good.All other hydraulics work good but what is stumping me is when checking pto pressure if you move loader up or down the prssure does go up to 150 but falls back down to 100.And after you lift loader 5 or 6 times it starts chattering and starving for oil.If I turn pto off loader works great.The pto shaft does turn but you could probably stop it by hand although I would not want to try it.It has to have a internal leak on that pto circut somewere. Or could wore out discs cause the low pressure?I think the old man said it quit all at once.
Anonymous-0
Well-known Member
Internal leak on PTO, either seal rings or tubes .. when you said when I turn it off everything works great..
MAY GOD BLESS THE USA
MAY GOD BLESS THE USA
Tx Jim
Well-known Member
- Location
- Coyote Flats, Texas
dieseldoc
Did you check lever by left heel seating in seat is engaged as Stev in IL suggested?????
If you checked lever I think pto supply line is cracked or loose.
Don't be overly concerned about loader being plugged in to SCV's. If JD engineers thought it was OK to offer the option of operating the new loader by scv's they must have thought it would work. GRANTED RETURNING HYD OIL TO THE FILTER is better but it's only necessary for steady operation not picking up a load or two. Besides you know you don't have an open-center valve to effect operation.
If the problem showed up "all of a sudden", I'd still suspect a faulty steel feed pipe. Like I said, it was a common problem in the 40 series. we had to pull apart many when new, and repair before they got sold. Sometimes you can fix it from the top with no major tear-down.
If it was leaking a long time before it blew out (if that's what happened), low pressure and slipping clutches in the PTO pack usually results in complete destruction of all the fibers and disks. They don't tend to wear much, they just burn up and warp with the friction linings peeling off. If that did already happen, they ought to show up in the transmission pump suction screen.
If it was leaking a long time before it blew out (if that's what happened), low pressure and slipping clutches in the PTO pack usually results in complete destruction of all the fibers and disks. They don't tend to wear much, they just burn up and warp with the friction linings peeling off. If that did already happen, they ought to show up in the transmission pump suction screen.
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