Case 990 hydraulic problem

Hello, I have been working on my case/David brown hydraulic system. I couldn't get the lift arms or front end loader bucket to work . I have finally found a major part of the problem, there may be other pieces to the puzzle that are yet to be discovered. The previous owner had hyd problems , the first thing He done was change the hyd filter and fluid. That did not fix the problem. I think the next thing that was tried to fix it was to pull the two valves located just behind the control lever, thinking that valve may have dirt or other debris in it.
When the new hydraulic filter was installed , it was allowed to come free of the suction line, the filter then tilted out of line with the suction line. When the filter housing/ bowl was bolted back on to the frame, with the filter being out of proper alignment with the suction line, as the filter housing was bolted up the filter pushed the suction line up too high to pick up any hydraulic oil, thus the pump wasn't feeding any of the hydraulic components. If any of you fellows have an idea as to how I can pull ( bend ) the suction line back into place, I would appreciate your suggestions. Mr. Martin or others may have experienced this situation before and have a solution. Thank You for any help. Steve

Isn't the suction line held in place by a single bolt? Did the PO remove the bolt? Look for an empty bolt hole on the suction line. Look at part #12 in the diagram at the following link:

https://partstore.caseih.com/us/parts-search.html#epc::mr58753ar1289479
Parts diagram

Sir, Yes, that is correct, a single bolt holds the suction line in place . The suction line had so much pressure pushing up on it that the flange on the suction line bent upwards about 1/2 inch or so. Just enough so that the connection between the filter and the suction line cannot be made. The suction line must be bent back down in order for the filter to seal. There's not much room to work with. I haven't decided how to go forward at this point. If I could find a puller small enough to reach up inside the transmission case, I may be able to pull the suction line back into place. Thanks for your reply and, for the link you provided. Steve

It happens when water is in the oil filter and it freezes. Pushes that tube up, seen it dozens of times.

The tube can be removed and straightened by removing the PTO gear box and unbolting the tube from the hydraulic pump.

Sir, You are sure appreciated. Thanks for the info. Something else I would like to get your thoughts on. I assembled a new filter and the wire mesh relief type filter, then set them in the filter housing. I then laid a strait edge across the end of the filter ( the end with the o-ring on it ) , then I measured from the strait edge to the flange on the filter housing, noting how much the filter sticks up above the edge of the filter housing. I then went under the tractor and laid the strait edge across the opening where the filter housing bolts up. I measured up from the case to the deepest place in the suction pipe, ( where the end of the filter fits ) . With the measurements I got and compared, it doesn't seem to me that the filter would push up into the socket of the suction pipe very far, even when the pipe is in its correct position. Your thoughts ? Are you aware of any filters that have a longer neck on them or, made so that they sit higher in the filter housing ? Thanks much, Steve

Get the tube straight then check your measurements.

Quality varies wildly on these filters, but I haven't encountered a dimensional issue.

Mr. Martin, You were correct on your diagnosis of the conditions that were the cause of the bent suction line. Of course I realize your wealth of knowledge concerning the maintenance of the tractors and other equipment. The expansion of the water in the hydraulic oil when frozen was the culprit.
When I ask you about any (dimensional differences) in the filters, I had failed to notice another problem related to the action that caused the suction pipe to bend upwards. After making all the measurements related to the connection fitment of the filter and suction pipe , I finally realized that when the ice expansion pushed the suction pipe upwards, the expansion had also pushed the bottom of the filter ( bowl / housing ) down, thus increasing the distance from the bottom of the filter housing to the seat in the suction line.
I am now trying to decide on how to reform the filter housing. I have thought about bolting the filter housing , ( less the filter ) , back to the tractor and using a hydraulic jack to push up on , or press the bottom of the filter housing back up, thus adjusting the dimensions to as near ( original distance ) as I can. I don't know whether to use heat ( acetylene torch ) or not. I would appreciate your thoughts on this situation and repair. Thank You, Steve