IH 1566 Hydraulic Problem, Lost Hydraulics

[cowboyken]

Have a 1566 Black Stripe, Full cab and lost hydraulics. Sometimes they will come back.

Last time it seemed like it was sucking air in the system as steering and brakes were speratic and jerky, then quit all together. Shut off for 5 min and worked again for 5 minutes. Quiet till the 5 min us up, then will squeel like sucking air.

Oil level is full, actually above full. Filter was changed and bi-pass cleaned also. Rear hydraulics run off another pump and will work sometimes, and sometimes not.

Checked for water or ice in rear end, but none found. Removed valve body and found a O-ring that needed replacement, but not on the suction side and showed no signs of leaking even though it was squished out. Front pump checked out good.

Last time rear pump worked remotes and 3pt hitch, but lost front pump pressure, IE: No Steering, Brakes or Hydraulic clutch.

Thinking the pickup tube loose or bad O-ring there. Anyone have any input? How do you access this pickup tube? Parts book shows it but not the location. Maybe behind the filter assy?
 

[the tractor vet]

You could have a crack in the pick up tube or it may be ready to fall off. It is located in the rear end housing . You can remove the 3 pt. top link plate and look in and see it . But ya need longer arms then i got to reach it . I have allways pulled the rockshaft housing . IF everything is not working It maybe the splines on the pressure plate and the PTO input shaft failing . When everything stops see if the PTO is still working as it has it's own pump and as long as the main shaft is turning the PTO will work But if it is not then one must look to the pressure plate and the PTO input shaft.
 

[cowboyken]

I just started the tractor and the rear pump that works the 3pt and rear remotes is working, but seems to be sucking air. Making airbound noise.

The front pump seems to not be pumping. Has a new clutch assy installed last spring with just 50 hours use so it is not the drive shaft.

I am leaning to either the main pick up tube that supplies oil through the oil filter, or the cross pick up supply tube that goes from the right to the left of the tractor supplying oil to the rear pump.

Either way that may starve the front pump from getting fluid. The front pump is sucking air and will need primed. The rear tube may be falling off, or a major leak from the tube that supplies the rear pump.

Does this sound correct? I will pull the 3pt top link plate and see what I can see. Hope it is a easy fix. Don't want to remove the cab if possible.

COWBOY in Northern Maine
 

[Jim J]

Check the o-ring on the filter cover before you do any thing else.
 

[cowboyken]

I have checked that first thing. I even replaced it just in case, but still no pressure.

Thanks for the input.

COWBOY
 

[pete 23]

I think you are on the right track with the main suction tube in rear end, however, if the suction tube seal on hitch pump leaks it can affect both pumps, when you pull filter does oil keep coming out of the housing from around the hitch pump suction tube(from behind the plate filter seals against) You can get an idea from there also if main upper suction tube is flopping around.
 

[cowboyken]

I will do that next (Again). Right now I have the upper 3pt link arm off and the plate. I an see in the rear end, and it is filled to the center of the axle shafts (Over full) so I will have to drain this to access the pickup tubes visually.

Trying to find a few more clean 5 gal buckets around. I have 4 right now and sure I will need at least 6 or 7. I have plenty but burried under 5 feet of standing snow at the moment. Book says 24 gal to full amrk, but I have at least 5-8 gal overfilled.

I was wondering if the plate on the left side of the transmission, just to the front of the rear pump, if removed, will this give me access to both pickup tubes?

COWBOY in Northern Maine