M543 Lost Hydraulics

[flashbucks]

While using our wrecker to rearrange the yard, we lost all hydraulic pressure to the crane. Yes it is in gear, yes the power divider is in the forward position (drive shaft is turning all the way to the pump) . Everything was running great then the rotation of the crane started to be a little "jerky" under load and finally all hydraulic pressure was gone. We were low on fluid but adding fluid did not help. Any thoughts? Thanks, Gregg

 

[country]

Check the CV/power divider shaft and joint are still driving the pump

if they are still turning the input to the pump, you will most likely need a main pump

 

[flashbucks]

Check the CV/power divider shaft and joint are still driving the pump

if they are still turning the input to the pump, you will most likely need a main pump

Dave, I was under the truck yesterday and the shaft is turning all teh way up to where the pump attaches at the center of the crane. How much is a new pump? do you carry rebuilt pumps?

 

[flashbucks]

Dave, I was under the truck yesterday and the shaft is turning all the way up to where the pump attaches at the center of the crane. How much is a new pump? do you carry rebuilt pumps?

After pulling the pump, having it inspected (wear plates are scored) decided to replace the pump. Also looked at the drive under the pump and realized the block ("cushion block") is separated and will need to be replaced. For those who don't have wreckers, the block had two splined gears that are contained in a metal sleeve and surrounded by rubber. This provided a cushion between the gear box and the pump allowing a very small amount of flex between the two. When we pulled the pump the top gear came out with the pump leaving the metal sleeve, the rubber and the bottom gear. ended up welding a round bar across the metal sleeve and prying it up and off. It brought the rubber with it. Could not get the bottom gear to come off the shaft so ended up drilling and tapping it and using a two prong puller to get it off. Just glued together with 50+ years of dried grease. New parts going back in next week.

 

[flashbucks]

After pulling the pump, having it inspected (wear plates are scored) decided to replace the pump. Also looked at the drive under the pump and realized the block ("cushion block") is separated and will need to be replaced. For those who don't have wreckers, the block had two splined gears that are contained in a metal sleeve and surrounded by rubber. This provided a cushion between the gear box and the pump allowing a very small amount of flex between the two. When we pulled the pump the top gear came out with the pump leaving the metal sleeve, the rubber and the bottom gear. ended up welding a round bar across the metal sleeve and prying it up and off. It brought the rubber with it. Could not get the bottom gear to come off the shaft so ended up drilling and tapping it and using a two prong puller to get it off. Just glued together with 50+ years of dried grease. New parts going back in next week.

Finally got the new block under the pump and we have hydraulic pressure again.

 

[frank8003]

After pulling the pump, having it inspected (wear plates are scored) decided to replace the pump. Also looked at the drive under the pump and realized the block ("cushion block") is separated and will need to be replaced. For those who don't have wreckers, the block had two splined gears that are contained in a metal sleeve and surrounded by rubber. This provided a cushion between the gear box and the pump allowing a very small amount of flex between the two. When we pulled the pump the top gear came out with the pump leaving the metal sleeve, the rubber and the bottom gear. ended up welding a round bar across the metal sleeve and prying it up and off. It brought the rubber with it. Could not get the bottom gear to come off the shaft so ended up drilling and tapping it and using a two prong puller to get it off. Just glued together with 50+ years of dried grease. New parts going back in next week.

Letssee " Just glued together with 50+ years of dried grease. New parts going back in next week. "
Me thinks somebody should have performed all the TM's within the last few ours of running it. Why do I bet is was supposed to be GAA and got substituted?
Hey, but what do I know.