I bought an old IT book (#C-19)off of ebay and carefully read the 6 pages on troubleshooting the COM on my 530CK with low clutch pressure. I did the COM pump test and I had 180 psi at the COM filter- which is within the IT book specs. So, following the directions in the IT book, I shimmed the spring on the "clutch regulator" relief valve with 2 washers (the IT book shows that the clutch regulator valve is located in the middle of the square housing that also has the clutch pedal spool valve and direct drive spool valve). After I added the washers behind the spring, the clutch pressure did not increase (stays at about 70 psi at T fitting at full throttle), but strangely, the convertor pressure was 30psi before I shimmed it and 50psi- after I shimmed it (the IT book says that the convertor pressure is the pressure on the gauge when the clutch pedal is pressed down so thats how I know that the 50 and 30 psi pressures are the convertor pressures- they were the pressures when the clutch pedal was pressed down) So, based on my results, should I assume that the IT book is wrong and the spring I shimmed is actually the torque convertor relief valve/regulator? If the book does have them backwards, that would mean that the other relief valve- the one located in the center of the COM top plate (the one with the temp sender attached to it- which my IT book says is the convertor relief valve) is actually the clutch pressure regulating relief valve. If so can/should it be shimmed? I just can't imagine that the IT book would have these labeled and described backwards- but that is the only thing that makes sense to my small mind based on my pressure readings before and after shimming that spring. I even took the washers out and repeated my test and then added them again and repeated the test with the same results. Anybody have any ideas or experience about which valve should be shimmed to increase clutch pressure without increasing convertor pressure? I also wish some knowledgeable person would please post a schematic for the flow of fluid through the COM spool valves and regulators. Thanks in advance for any assistance.
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