chev0545 231 #1 Posted July 23, 2019 anyone on here rebuild these hydro's? Share this post Link to post Share on other sites
daveoman1966 3,586 #2 Posted July 23, 2019 What model tractor / Sundstrand ??? 1 Share this post Link to post Share on other sites
chev0545 231 #3 Posted July 23, 2019 13 hours ago, daveoman1966 said: What model tractor / Sundstrand ??? 1975 c-160 pump model # 90-1140 Share this post Link to post Share on other sites
pfrederi 17,129 #4 Posted July 23, 2019 What is the issue? Lack of power, leaks 1 Share this post Link to post Share on other sites
bc.gold 3,399 #5 Posted July 23, 2019 1 hour ago, chev0545 said: 1975 c-160 pump model # 90-1140 If your 90 is an inline the repair manual has been up loaded to redsquare. If your unable to locate I have a copy archived online but need an email address to send permissions. 1 Share this post Link to post Share on other sites
chev0545 231 #6 Posted July 23, 2019 2 hours ago, pfrederi said: What is the issue? Lack of power, leaks ran out of power.changed oil & filter,didn't help after it got hot Share this post Link to post Share on other sites
chev0545 231 #7 Posted July 23, 2019 2 hours ago, bcgold said: If your 90 is an inline the repair manual has been up loaded to redsquare. If your unable to locate I have a copy archived online but need an email address to send permissions. wouldn't know where to start Share this post Link to post Share on other sites
bc.gold 3,399 #8 Posted July 23, 2019 1 hour ago, chev0545 said: wouldn't know where to start From tractor data I see that your hydro is a belt driven unit you need to find the correct service manual inside you'll find a diagnostic section. Symptoms along with suspected part malfunction, in addition the test ports will be shown along with pressures expected from each port. Those test ports are the holy grail, no secret shall remain untold. Not sure about your hydro but mine can not be bench tested before or after a rebuild due to the oil flow circuit, oil flows through the unit back into the transmission. 1 Share this post Link to post Share on other sites
daveoman1966 3,586 #9 Posted July 24, 2019 The issue you have....power loss when at operating temp...is a classic sign of internal wear. There is no cure, except surgery. Your PUMP and Hyd MOTOR both need rebuilt. It is pointless to rebuild one and not the other as the oil is common and the internal components are nearly identical. It is the contaminated oil that wears out the parts. This is NOT a difficult task, but is a tedious one. Download the 4 section repair manual for starters. I can provide sources to buy new seals to cure the leakage problem. I have also uploaded an Excel SS on this Piston-to-Piston model(s), but no sure where the moderators list it. I've rebuilt many of these...you can too as all you do is resurface internal parts on fine grit sandpaper...for the most part. 1 Share this post Link to post Share on other sites
chev0545 231 #10 Posted July 25, 2019 On 7/23/2019 at 11:45 PM, daveoman1966 said: The issue you have....power loss when at operating temp...is a classic sign of internal wear. There is no cure, except surgery. Your PUMP and Hyd MOTOR both need rebuilt. It is pointless to rebuild one and not the other as the oil is common and the internal components are nearly identical. It is the contaminated oil that wears out the parts. This is NOT a difficult task, but is a tedious one. Download the 4 section repair manual for starters. I can provide sources to buy new seals to cure the leakage problem. I have also uploaded an Excel SS on this Piston-to-Piston model(s), but no sure where the moderators list it. I've rebuilt many of these...you can too as all you do is resurface internal parts on fine grit sandpaper...for the most part. dmeyer2259@comcast.net Share this post Link to post Share on other sites
