The Fordson Tractor Pages Forum

I have tried to find reason to this. It must be somewhere between control lever and piston. But hey! Even we are not able to find reason, but now it works! :D Thanks for everybody for ideas and lets hope this thread helps also some one else in future :lol: If some one is interested how I found root ...

Piston was clean and ok. Oil return path stays open until lever is pulled over the limiter bolt.

Problem seems to be solved now. She can lift 450kg easily while engine revs idle. During lifting, pressure is around 120bar and it drops to zero when top point is reached. In first pic lift doesn't work: https://i.postimg.cc/d3wf37Lx/20190923-095915.jpg In second pic it works https://i.postimg.cc/BZ...

Thanks Rick! I do understand your point.

Thanks, I understand your point. I´m 100% sure that my pump characterics are not even close comparing new one :D but 500kg lift would be just enough for me. I understood that valve assembly has unloading valve with pressure setting of 2200psi/150bar? Please correct if I´m wrong. But, if we we compar...

Summarising so far You have cleaned and checked the pump intake so there is no probability of being starved of oil Yes You have had movement of the arms (without loading) so there is no mechanical problem like seizure in the ram or linkage Yes and also movement with 200-300 kg load (Only high revs)...

An idea, remove evry thing from the valve assembly and blow some are trough all the holes. See if some route is blocked. Could be dirt or a bit of white tape to seal a connection that went in a chanel and is obstructing something. Good idea. I already dismantled whole valve assembly, or at least al...

hi I think you need to run a test of the pump itself "in tractor",ram and cover off,then fit an outlet pipe to the pump itself with handoperated "strangle-valve"+your preassure gauge.This should give you a realistic picture of the pumps capacity and perhaps remove some unknowns from the equation :D...

Ram works with out load. Can lift load about 200kg with full engine revs. With load, engine idle, lever up, no pressure. Engine with full revs, lever up, pressure about 70bar (max) Okay, here comes the next part of story: https://i.postimg.cc/k59XP1Bs/Pic1.jpg Picture 1. https://i.postimg.cc/d04vPqM...

Is the pressure varying with the engine speed ? i.e. when you rev up do you get more pressure ?? if not I would suspect the pressure relief valve as more revs to the pump should result in more pressure as the oil flow should increase in greater proportion to leakage in the pump mechanism whereas a ...

SvendH wrote:Was the tractor lifting Something when you measured 150 bar? Otherwise I dont See how it can build such pressere,are you sure the lift isent jammed somehow.

Please see first picture. Pressure is measured directly from pump supply line. Valves are not involving measurement.

SvendH wrote:Are we certain it is bar and not psi?
1bar=14.6psi

Bar-meter

https://i.postimg.cc/250fBJ6v/20190907-182207.jpg upload free https://i.postimg.cc/gjSwS4N6/20190907-182117.jpg Pump shimmed. End bearings grinded and smoothed with 600 sandpaper and 0.5mm shim plate added. 150 bar pressure, but still wont lift. Next phase will be disassembling of top cover again. ...

Hi there, Looking at the foto "nasty grooves" and at the area around the hole where the lower rotorshaft goes,it looks to me that a considrable wear has taken place increasing the "end clearance" of the rotor.I think that is where you are loosing pressure. Kind Regard svend. Svend, First of all, th...

Between housing and gear axle is less than 0.05mm.

https://i.postimg.cc/bJQYTfQ9/auki.jpg https://i.postimg.cc/mgtbnHYD/runko.jpg Seals are used less than 10 hours. https://i.postimg.cc/sxmVkPHB/ratas-runko.jpg 0.05mm gap between gear and housing https://i.postimg.cc/mZy21RZb/rattaat.jpg 0.3mm between gears https://i.postimg.cc/dtQQ8XDG/pesat.jpg N...

Hi all. This is my first post about 1955 Major hydraulic pump even there is many topics about it. My Major is suffering very weak lift of 3-point linkage since last spring. At this far I have changed: - all O-rings of: - valve assembly - pipes - hydraulic cylinder and pump. - Filter is cleaned and o...