2110LCG (1971) 3 point won't raise

3 Point was working fine. Using a brush hog to cut a field. After about an hour of use, the 3 point wouldn't raise. I'm waiting for my service manual. Any ideas on what to look at first?

Thanks.

Check the fluid level first.
Then bleed the pump.
Let us know your results.

Thanks Ultradog. Newbie to this tractor - waiting for the service manual to be delivered.

Where/how do you check the level on the rear end? I have an SOS transmission. Are the rear end and transmission both tied to the same volume of hydraulic fluid, or is the rear end a separate reservoir?

The locations and methods for checking and replacing the fluids and filters should be in the owner's manual, not the service manual.

The 3 point hydraulics sump is the rear axle center housing and the fluid in there lubricates the rear axle as well as provides the fluid for the 3 point lift.

The transmission has a separate sump.

The rear axle/hydraulics sump has a level check hole on the right side of the center housing near where your right heel is when you're sitting on the tractor, and it should have a square headed pipe plug. Make sure you don't remove any hex head bolts in that area, just the square headed plug. The fill hole is up on top of the differential housing, just below where your right butt cheek is when you're sitting on the tractor. It should have a large hex head plug. Fill it through the top hole until fluid just begins to drip out of the side hole.

The S-O-S transmission has only one hole that is used for both filling and as a level check. It is on the right side just in front of the seam between the transmission and rear axle center housing, near the brake pedals. It should also have a square headed pipe plug. You'll need a flexible funnel to fill it.

Thanks Sean! I'm blind without the manuals at this point....

I've highlighted the bolts I believe you described. Please confirm if the fill bolt is #1 or #2 in the photo, and if the level bolt is the one with the red arrow.

Thanks!

The level check is the one that you've got the red arrow pointing at.

The fill plug should be farther back than the bolts you have labelled as #1 and #2. It is not on the hydraulic top cover. It is further back, on the differential housing, where the top of the housing is actually curving down toward the back, next to the draft spring. The actual plug is larger than the hex head that is sticking up.

Thanks Sean.

Is this the one?

Sean,

Was this the correct plug for the rear end level check?

Thanks!

(quoted from post at 08:01:49 09/23/14) Thanks Sean.

Is this the one?

Click to expand...

Yes, that is the fill hole plug.

(quoted from post at 08:04:28 09/23/14) Sean,

Was this the correct plug for the rear end level check?

Thanks!

Click to expand...

Yes, that is the level check plug for the rear end/hydraulics.

Thanks Guys!

What's your opinion on using the 2110LCG with SOS for plowing with a 2-bottom plow? Any issues/concerns with using the SOS transmission for plowing?

(quoted from post at 16:32:10 09/19/14) Check the fluid level first.
Then bleed the pump.
Let us know your results.

Click to expand...

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The plug should be the only one on the pump with a recessed hex head that would accept a large allen wrench. it should be on the outboard side of the pump, just below the center line, opposite from where the lines going to the rear end are connected to the pump.

(quoted from post at 07:40:14 09/29/14) The plug should be the only one on the pump with a recessed hex head that would accept a large allen wrench. it should be on the outboard side of the pump, just below the center line, opposite from where the lines going to the rear end are connected to the pump.

Click to expand...

Brain was thinking aux cover on the 3-point cover, not the pump. Should have re-read the instructions.

Thanks!

If you bleed it to the pump and it still has problems, the next step would be to bleed it to the auxiliary plate, which would be the bolt with the larger head near the front middle of the plate.

With both bleeding points, don't remove the plug completely, just loosen it until air and/or fluid starts escaping and let it run until fluid is running out with no air bubbles and then close it up.

Do you think they would have bled the system when they changed they hydro fluid at the dealer?

I can't say as i don't know the folks who did it. Mine did not need bleeding when I changed the fluid and filter a couple of years ago. The pressure came right up and was a little jerky the first time, and I cycled the lift up and down a couple of time and it's been fine ever since.

OK. I've had the fluid changed, and bled the pump, but the lift action is still intermittent. If I'm cutting with the brush hog lowered and move the lift control level to lift the 3-point, nothing happens (some of the time). When this happens, If I leave it in the lift position while I'm cutting, 10-20 minutes will pass, then suddenly the brush hog is off the ground... No rhyme or reason to it.

I did notice that the lift control lever feels firm (like I would expect it to) at the top of it's range of motion, but once the lever is at 50% or lower (lowering the arms), there is no resistance on the lever motion, and the lever (if I let it go) will drop to the bottom of it's range.

The manual suggests it may be one of the following:
a worn or loose selector valve
unload valve sticking
faulty back pressure valve
control valve incorrectly adjusted.

Also - when I purchased the tractor, the selector valve lever was missing, and the valve was in the draft control position (same issue was happening), and I moved it to the position control position.

Any ideas on where to start digging would be greatly appreciated. Hoping to get all my cutting done this fall before cracking into this.

(reply to post at 17:10:09 09/29/14)

Click to expand...

Finally solved this one today.... The larger return hose to the hydraulic pump does not have any sort of nut, etc. on it at the hydro pump end, so occasionally it pops out, causing the pump to lose prime. A couple clamps later, and the 3 point now works flawlessly!

Thanks guys!