MF1105 hydraulics

[Binnsp]

My power steering is slow to power up; 3 PT. Hitch lifting is weak and PTO lacks power. I think they are all dependent on hydraulic pump. I replaced filters and hyd oil but little changed. Do they all run off the front end pump or is there something else which requires splitting the tractor to repair or replace?

 

[Gearhead210]

There is a priority valve in front of cab above engine
I would look at if your fluids and filters are good.
There is a cartridge filter in front of radiator and then
a strainer screen that is under rear end above
drawbar. The steering , brakes, and possibly
pto/multi power run off low pressure circuit.
Remotes and 3 pt run off high pressure circuit.
Priority valve can make all work badly or not at all-
there are cartridges in there known for seizing up.

 

[Binnsp]

. Really appreciate your reply. No one had previously mentioned the Priority Valve. This could well be the culprit as my multi power has not worked for a long while although I previously had the (clutch pack)? for it replaced. Would you think the Priority Valve should be replaced or perhaps rebuilt? If possible, I would try to clean/dislodge whatever is seized? Thanks so much.

 

[holm1155]

The pto and the MP run off the low pressure low volume side of the
charge pump. The high volume side of the charge pump feeds the
radial pump up front. The radial pump goes to the priority valve
which keeps a constant flow and pressure to the steering. The rest
of the oil goes to the remote valve and 3 point.The brakes are fed
from run off oil from the mp/pto valve and the priority valve.No
pressure or very low pressure.My guess would be the charge pump is
bad.Better get some pressure checks and a flow reading to verify.