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You must gain access to the lines which interconnect the oil pump to the parts of the engine receiving pumped oil -- and the only access opening is the crankcase cover, a small plate well tucked in under nearly everything! Without removing the hood and fan shaft, you will need to be a virtual Hoodini to undo the lines once you remove the C/C cover! This is a major task. And without disconnecting the oil lines, attempts to lower the oil pump assembly will result in damage to these precious lines. Oh - believe me, I've had folks call me who have tried --even tried a carpenter's pinch bar! Here is an excerpt from the John Deere Model "H" Service Manual - - - 2-29. Oil Pump, R/R -- To remove the pump, remove crankcase cover (paragraph 2-26) and disconnect oil lines from pump body. Remove pipe plug from right side of crankcase and screw oil pressure adjusting screw completely in. Remove cap screws (or nuts) retaining pump to crankcase and withdraw pump. TIP -- Record how many turns it takes for the screw to go all the way in. Set the adjusting screw at the same position during installation. TIP -- When reinstalling the pump, reconnect oil lines BEFORE final tightening of cap screws (or nuts) retaining pump to crankcase. Slight misalignment is very probable and makes reconnection of oil lines more difficult. 2-30. Oil Pump Overhaul -- Disassembly of the pump is quite evident after an examination of the unit in reference to PC304, page 3 (Parts Catalog). Cleaning all sludge from the pump is a primary objective along with inspection of gears and replacement of the gasket. Be vigilant when reassembling the pump; use a new B246R gasket. It is a thin gasket, item 28, PC304, page 3. WARNING! A homemade gasket (28) is not recommended because it may be thicker than the B246R design. A thicker gasket will result in oil pressure loss because the gear cavity is made larger than it should be by a thicker gasket, and the oil "slips by" the gears." You may call me (830) 627-0430 -- if I am in the office, I will pick up. (PatB)
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