Posted by Owen Aaland on May 03, 2010 at 22:11:50 from (65.165.246.60):
In Reply to: 1206 MVC pump posted by IH1978 on May 03, 2010 at 19:59:22:
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.
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