MF 165 hydraulics

piston

I bought a 1970(ish) MKII 165 (no multipower).

The lift works fine when the tractor is cold but as it warms up, it the lift performance drops to the extent it won't lift anything very much at all unless you use a big rev.

The filter and back end oil have been changed quite recently but it's made no difference.

Is this likely to be a knackered pump or do I need to look elsewhere for the problem.

kay 9

Sounds like seals, as the oil gets hot it may be passing through. Just a guess but might be worth checking out. What oil ya using? Ya need to be using 80w or 90w oil in that if ya can get it. Most of the newer machines today are using much lighter such as 10w and it won't operate right with that oil.

Takestan

I have 165 where is filter for hydraulics lift seems v sluggish and thinking now it could be blocked filter

bee_keeper

that old series of massey had a piss poor hydraulics , centurys behind the ford , international , JD or even zetor of the same era

piston

kay 9 wrote: »

Sounds like seals, as the oil gets hot it may be passing through. Just a guess but might be worth checking out. What oil ya using? Ya need to be using 80w or 90w oil in that if ya can get it. Most of the newer machines today are using much lighter such as 10w and it won't operate right with that oil.

I'll double check what oil I have as I bought it from a local garage which tends to specialise in older MFs and I just accepted what he recommended without question as I didn't know myself.

marlyman

piston wrote: »

I bought a 1970(ish) MKII 165 (no multipower).

The lift works fine when the tractor is cold but as it warms up, it the lift performance drops to the extent it won't lift anything very much at all unless you use a big rev.

The filter and back end oil have been changed quite recently but it's made no difference.

Is this likely to be a knackered pump or do I need to look elsewhere for the problem.

Hi piston. Your problem is the pump is worn out. Get a hyd pump repair kit. Theyre cheap and bring the pump back to new spec
Do not use gear oil. Use multiporpose oil only.
Takestan - sounds like a blocked filter. You have to lift the lift cover to get atit. Dont forget to remove the hyd lever rollerthrough the side panelor youll be fishing for it.

Bonus_Pack

piston wrote: »

I bought a 1970(ish) MKII 165 (no multipower).


Is this likely to be a knackered pump or do I need to look elsewhere for the problem.

It's the pump or the cylinder is at fault. And to be honest if your level of knowledge is such that you have to come on here to diagnose a fault in such a simple mechnism then I don't think you are competent to repair it. You should call a mechanic. As regards oil, get the correct spec from MF, don't just guess what oil to use.

marlyman

Hi. Here use this. http://www.qtponline.com/manuals.html . Click on 188. Its the workshop manual on how diagnose. Anyone is able to work on these machines with a small bit of knowhow. Noone can correctly diagnose your situation without removing the lift cover or having xray glasses. Agaim use only mp oil.give me a pm f you need a hand.

piston

Thanks for the manual.

I have a lot of mechanical experience but have never specifically worked on the hydraulic system of an MF before and was really looking to rule out any simple issue before I lift the cover.

marlyman

piston wrote: »

Thanks for the manual.

I have a lot of mechanical experience but have never specifically worked on the hydraulic system of an MF before and was really looking to rule out any simple issue before I lift the cover.

the flow of oil to the lift arm goes from the pump up through a metal pipe into the lift over and into to the lift cylinder. The piston in the cylinder is connected to the shaft that attches to the lift arms.

my opinion (for what its worth) on what going on is - when the oil is cold its heavier and thus an wear in the pump or cylinder will not be a problem. as the oil get hotter and thinner either 1. the pistons and valve chambers in the pump are too worn and now the thinner oil will escape. 2. the piston rings in the cylinder cannect to the lift shaft cannot seal the oil ( also impling that the cylinder bore could be worn past tollerance. 3. the pipe carrying the oil from the pump to the lift cover ( the stack pipe) has 2 sealing rings top and bottom, these could be blown - unlikely. lastly you lift cover is cracked under the seat of the tractor but youd see the leak.

after removing the seat from the tractor MAKE SURE to open the left hand side round cover of the gearbox. here you MUST remove a little roller on the linkage before you lift the lift cover. see fig 23 on page 7A-19.

that pump can br repaired back to new with a commonly available service kit. its not tricky just dont rush it. drain all the oil out and powerwash the inside. then itll be like new.

9935452

marlyman wrote: »

Hi piston. Your problem is the pump is worn out. Get a hyd pump repair kit. Theyre cheap and bring the pump back to new spec
Do not use gear oil. Use multiporpose oil only.
Takestan - sounds like a blocked filter. You have to lift the lift cover to get atit. Dont forget to remove the hyd lever rollerthrough the side panelor youll be fishing for it.

You dont need to remove the lift cover.
Take off the panel that contains the lever for the PTO. You might need to drain some oil for the back end or park the tractor on a slope.
reach inside and you will find the filter held on with a type of wing nut. Remove this and the filter comes out.