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|Brad||When the three point hitch is raised under load, a rapping can be heard in the area of the main hydraulic pump. It works fine, but it is noisy. waht could cause this? The tractor is a '68. Also, can this pump be removed by pulling the PTO shaft out the back and removing the rear housing top cover?
|Alan Lewis||Sounds like a worn pump if the lift is also jerky under load it is a combination of worn pump and bad pump valves.
To remove the pump you will have to lift off the top ram cover, before you do this there are two circular side covers to come off and a little roller to remove from the pump valve, get this wrong and disaster due to what you can bend/break,
Then the power take off shaft ( before you do this place the ground speed PTO gear into position this stops it dropping down when you remove the shaft. then it's only pump mountings and transmition sleave.
There are a number of special tools to strip this unit and to allow for correct reassembly, to allow location of differant things which are critical (inclueding replacment of that little roller) ,and a number of settings to allow the hydraulics to work correctly when reassembled.
|Mike Walters||I have a 1972 Massey 135 I also have the same problem I believe. If you allow the 3 Point hitch to go up all the way and leave the preasure on it there is a knocking noise when it reaches the top also when you lift a heavy load in the bucket but the hydraulics seem to work fine not jerky
|Simon||Just check that you are not pushing the position control lever too far forward beyond the transport position and into the constant pumping position. If you are, you are raising the system pressure against a deadhead which will cause the relief valve to unload and create a hell of a noise. Have a look in your operators manual if you are not sure and then get another lock stop and fit it into the quadrant slot to prevent moving the lever to this position.