jim warehime
Member
Has good pressure to raise and hold but won't release. Played with the lever but no luck, guess it's internal what should I look for when I open it up? Thanks jim.
- Thread starter jim warehime
- Start date
Andy Martin
Well-known Member
By played with the lever do you mean you loosened the bolt that holds it on and made sure the lever was fully engaged with the detents in the shaft?
jim warehime
Member
Yes, it has tension on it and will click in
when in the raised position and hold the way
it's intended, when you release it to lower
the implements it does nothing.
when in the raised position and hold the way
it's intended, when you release it to lower
the implements it does nothing.
Andy Martin
Well-known Member
Is the rod straight? sometimes you have to push down hard to get the internal lever to lift and release the pressure. If it hasn't been use din a while it could just be stuck. Just letting the lever go forward does not release completely.
Jim guess you loosened hose at pump opening to see if pressure releases. If it does the unit probably needs to come out. The two pins under the lever with white mark pushes in to push balls off a seat to let oil back to unit. One pin for left rear port and other for other ports. When operating lever is moved forward other than the left rear port are supposed to release first just ahead of left rear depending how far forward operating lever is pushed. But they release so close together on most it's hard to tell when pushing operating lever forward. Operating lever ends up going in a notch on back of picture and moves parts across to the little lever with white.
Check for lever or a pin broke in linkage or pin to ball with pump out of reservoir housing. If all so far is okay the pump will need apart to check pins springs and balls. Unless for some reason you have a problem with lever on inside that's on shaft operating lever rod goes to. Doubt that if it still moves to lift.
Not that hard to work on. Maybe the hardest thing is putting pump housing back in reservoir.
Check for lever or a pin broke in linkage or pin to ball with pump out of reservoir housing. If all so far is okay the pump will need apart to check pins springs and balls. Unless for some reason you have a problem with lever on inside that's on shaft operating lever rod goes to. Doubt that if it still moves to lift.
Not that hard to work on. Maybe the hardest thing is putting pump housing back in reservoir.
gene bender
Well-known Member
What are you lifting with what kind of cycl on the devise explain
gene bender
Well-known Member
That port will not cause any problem as long as it is hooked to a single way operation it will just be delayed a tad when lifting but not even enough for you to notice as it work the same as the front port just delayed action lifting
Will just say again, make sure problem is not external. will cylinder retract with hose lose?
Oil sucked in at lower end of picture, Pressure from gears pushes both balls back on right side of picture. yellow to right and left front. When lift stops balls seal pressure from returning. All ports get the same pressure. Without a delay lift valve everything will lift equal with same load. But different loads or different size cylinders will let the cylinder that takes the less pressure to lift load lift first.
Other picture is of pins that release balls. Big hole is for control spool to get pressure or circulate oil when no pressure is needed. Other picture is how linkage looks when pump unit is removed from reservoir. At the IH is where linkage from outside attaches. Piece running across with part number on it operates everything inside reservoir housing. Lever that pushes pins in on right.
Oil sucked in at lower end of picture, Pressure from gears pushes both balls back on right side of picture. yellow to right and left front. When lift stops balls seal pressure from returning. All ports get the same pressure. Without a delay lift valve everything will lift equal with same load. But different loads or different size cylinders will let the cylinder that takes the less pressure to lift load lift first.
Other picture is of pins that release balls. Big hole is for control spool to get pressure or circulate oil when no pressure is needed. Other picture is how linkage looks when pump unit is removed from reservoir. At the IH is where linkage from outside attaches. Piece running across with part number on it operates everything inside reservoir housing. Lever that pushes pins in on right.
Janicholson
Well-known Member
In the thousands of hours I have operated letter Farmalls, the lift rod pressure required to lower a load is directly dependent on the pressure in the system being held by the balls. If you are using a loader to hold up a 1200# bale, the lever will be difficult to push in. If lowering cultivators or an empty bucket, the lever will push in very easily. The balls have full hold pressure on their back sides and it is proportionally more difficult to push the balls open against this pressure. We get used to spool valves that are balanced and move with equal effort on all lift/hold loads. These balls are not. Wear can affect the leverage on the pins, and a bent control rod can flex and bow, If this is making sense, you might be running near the lift capacity of the Liftall. Jim
I have converted a few H and M's ball checks to the one used in the Super series. It has a small ball inside of an adaptor and that lessens the lever pressure it takes to lower the load. Makes a world of difference with heavy loads. Also, much easier to lower just a little bit at a time. I don't have any idea if the parts are still available now days though but an old donor Super series would have it.
jim warehime
Member
Have checked rod to make sure it was attached properly to pump housing. I am using a pair of 3 bolt cultivator cylinders and the implement on the tractor is a set of hm238 cultivators. Everything hydraulic wise is mounted properly and hooked up properly. The cylinders are good which I know for fact. I had to lower implement by cracking the lines at the fitting and letting them bleed off. Next step is going to be dropping the pump not fun with cultivators hanging off tractor.
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