ebinmaine 75,090 #1 Posted 20 hours ago I have a leak at or near the end of the transmission pump on my 1975 C160 Automatic. Is there a common problem or place to start looking? Possibly this end cap? Share this post Link to post Share on other sites
pfrederi 19,099 #2 Posted 20 hours ago The picture is the Hydro motor not the pump. I can't see the leak... 1 Share this post Link to post Share on other sites
pfrederi 19,099 #3 Posted 19 hours ago There are no seals on the motor just gaskets between it and the transaxle, and an O ring behind the circular end plate of the motor. There are also o rings to seal the acceleration valve on the front and back of the motor but I have not seen them leak. Share this post Link to post Share on other sites
ebinmaine 75,090 #4 Posted 19 hours ago 33 minutes ago, pfrederi said: The picture is the Hydro motor not the pump. I can't see the leak... There's a puddle on the floor but I wiped off the transmission before getting the picture. 21 minutes ago, pfrederi said: gaskets between it and the transaxle, That's been replaced but obviously could still be a source. 21 minutes ago, pfrederi said: and an O ring behind the circular end plate of the motor I'd start here... How do I find the oring size? Remove it and bring to a hydraulic shop? Share this post Link to post Share on other sites
squonk 44,795 #5 Posted 18 hours ago Make sure the control shaft seal isn't leaking and clinging to the frame making it look like something else. 1 2 Share this post Link to post Share on other sites
Bar Nuthin 1,668 #6 Posted 12 hours ago 5 hours ago, squonk said: Make sure the control shaft seal isn't leaking and clinging to the frame making it look like something else. Also make sure it's not leaking at the input shaft. They can mist fluid and the hydro fan will spread fluid to parts unkown making it look like it's leaking from somewhere else. Share this post Link to post Share on other sites
pfrederi 19,099 #7 Posted 3 hours ago (edited) Sunstrand hydo leaks are 99% of the time pump input seal, motion control o rings or hydro hose failures...and manifold leaks on D series. That your motor is painted black makes me wonder if some one separated it from the pump. Is the pump black also??? If someone did separate the pump and motor then that is a potential leak just like the manifold leaks on D series. Wipe it down and see if you can isolate the leak point Edited 3 hours ago by pfrederi Share this post Link to post Share on other sites
pfrederi 19,099 #8 Posted 3 hours ago Based on experience with WH O-ring part numbers i would say #92 is a Dash 132 Share this post Link to post Share on other sites
