Hydraulic Pump Screen TO 20

[PMNJ]

I recently had to remove the hydaulic cylinder due to a piece of metal getting into the cylinder and scoring the cylinder, piston and rings. The pump has has been dropped out to replace control valve, pressure relief valve and side wall gaskets. Has anyone ever heard of a home made solution to screen the pump so that this does not happen again? Unfortunately the TO 20 does not have a hydraulic filter.

 

[Joe Ferguson]

I do'nt remember which MH/MF models had magnetic drain plugs (magnet inside the plug). This magnetic drain plug will catch metal particles which may be cleaned by removing the plug.


my 2¢

Joe Ferguson

 

[trac]

I"m runnig this thourgh my head why can"t you take the allen head bolt out under the seat then put filter on then return it back just below in a bolt hole for the inspection cover? Someone must know if this can be done

 

[PMNJ]

I have the original drain plug and I don't recall it being magnetized.

 

[Jerry/MT]

That line supplies the lift cylinder so it would be a bypass to the lift cylinder and the cylinder would not work until the filter became blocked.
I believe there are two test ports; one at the bottom and one at the top. You could rig up a line to a filter from the bottom and take the filter output to the top port. It would function as a bypass filter. As the filter became restricted more flow would bypass the filter. Personally, I wouldn"t waste my time on that kind of lash up.

 

[John (UK)]

That is a pressure port and you would need a filter that could withstand a pressure of 2000psi on there. The oil goes into the Pump on the suction side and to-date there is no filter for this, but what you do need to do is change the oil as specified, every 12 months and that will wash all the crud out with the old oil and then you don"t need a filter. Water can only get in there is there is a leak, so fix the leak. You need a rubber boot on the bottom of the Gear Lever and replace the Felt seal that is under the Draft Spring at the back of the seat and it will be watertight [email protected]

 

[John (UK)]

it isn't magnetised on any of the grey tractors, that only came in with the 35 series...John

 

[Jerry/MT]

Respectfully John, water can and does get into the fluid from condesation as the temperature cycles up and down. Usually regular use will heat the fluid and vent off the water but when these tractors sit through several months, they pick up quite a bit of water from condensation, especially in humid climates.

 

[John (UK)]

I think that we are all aware of condensation problems by now, but I was talking about water entering the system. A lot of these tractors do stand outside and without being covered, so water will and does enter through the Gear Lever and the Draft Spring. If you prevent this water entering you wont have vast amounts in the system unless you forget to change the oil like some do.It is also obvious when there is water in the system and the oil needs changing by looking at the color. Condensation and water entering from outside will vary in amounts greatly. Have a Good Weekend!...John

 

[PMNJ]

I adopted this 20 last fall and changed hydraulic fluid and tuned up for a couple grass cuttings. Since I dropped the pump out last week I thoroughly cleaned the inside with brake cleaner to remove all the sludge buildup. The upper half of the control fork was rusting (condensation I assume) so i grinded it and applied rust converter to alleviate that problem. I am now just waiting for my new cylinder, piston, rings, control valve, relief valve, draft rod and plunger and gasket set. Looking forward to a new hydraulic system when it arrives monday.

 

[John (UK)]

Rusting can be a problem on some tractors and we do get some odd things wearing that on others never happens. Just keep the water out and you should be fine. Use flushing oil to clean out the housings as this will not dilute your new oil, you can never fully drain the housings and they specify that you don't use Diesel or Kerosene for the Cleaning. If you use Flushing oil and run it for quite a few hours and get it hot before draining it that will get most of it out, but the only true way of doing it is to tear it all apart. Perhaps something to do when you have nothing else to do (if ever...lol) If you need any information about the Tractor, just email me at [email protected]