1206 MVC pump

I just went out to start my 1206 for the first time since last fall. When I started it up I had no powersteering and no brakes. It does move in the high side of ta. I took out the plug on back side of mvc pump but nothing came out when I started it up, let it run for a while and nothing. I checked the hydraulic fluid it was about 2 gallons low so i stuck about 5 gallons in it so nows its about 2.5-3 gallons over filled. still nothing.

A little history, the power steering has always been slow to get going when started. a couple of times last summer i had to bleed the system(plug on backside of MVC pump) after sitting. even last summer when bleeding the system it hydraulic oil never really seemed to shot out like other tractors i have had to bleed out.

1st thing i'll probably do is change the filter but im really doubting thats the case becuase i doubt i have more than 25 hours on that filter.

I guess im just wondering what to else to look for. Is my pump shot????

If i need to take the pump out how much HY-tran drains out of the TA housing plug.....just wondering so i have enough buckets around to ketch it. thanks in advance.

With the engine idling and the plug out of the MCV apply a little air pressure to the transmission filler opening. Just wrap a rag around a blow nozzle and release air until it shoots out of the plug opening. Be prepared to quickly shut of the engine when the oil comes out. Keeping the hydraulic system overfilled by about five gallons will most likely keep this from happening again.

A new MCV pump may or may not cure the problem. The problem is not in the pump itself but a worn pump will cause it to occur more than a new pump. The problem occurs because air is entering in the suction side of the pump. A new pump is able to move the air better than a worn pump.

With the transmission filled to the correct level there are two places where the oil on the suction side of the pump is above the level of the rest of the oil. One is in the filter cavity where the oil pickup tube enters the filter cavity and the other is the seal between the the clutch housing and the rear frame. The seal between the clutch housing and rear frame is the common cause of the problem, especially if the seal used is an O-ring instead of the later used quad ring.

When using the tractor, when you slow the engine down, and you experience any loss of steering assist, loss of brake assist, TA downshifting, or the lube light coming on, it is time to replace the pump. Continued use of the tractor once those symptoms occur can lead to problems in the speed transmission, ring gear and pinion, and differential. Those parts are all lubed with oil from the MCV pump that is not used for steering and steering has priority. If you are not maintaining 3 GPM oil to the steering you are not getting any lube to the rear frame.

i should add everything seemed to work good (steering, brakes, TA) when it was primed and working I have never lost steering or brakes while the tractor was running, It just seems to loose its prime while sitting.

(quoted from post at 08:54:14 05/04/10) i should add everything seemed to work good (steering, brakes, TA) when it was primed and working I have never lost steering or brakes while the tractor was running, It just seems to loose its prime while sitting.

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That is why changing the pump will not necessary correct the problem.