Sorry to start a new thread but I'm desperate. I had my lift pump rebuild. It would lift and tilt but only had 1500 psi so it was a little weak. Now I don't have any lift or tilt. Forward and back grown a little at times but work OK. Fluid is full. Is there a way to bleed the air out of the system. I didn't think I lost that much oil. I've started it a couple of times and let it sit overnight but no change.
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No pressure at the aux port. The bucket tilts a "little". I think it's just air in the lines because the drive motors groan a little sometimes like its low on fluid. I just moved it back and forth. Just not sure how to bleed the air out. Just don't want to do any damage.Any pressure at auxiliary port? Take main pressure line off valve body and run an extension into a bucket, start machine for a second and make sure you have flow.
It really should bleed itself,. At least crack your pressure line with machine running,. It will make a little mess but make sure you have good flow. Does oil look milky white?No pressure at the aux port. The bucket tilts a "little". I think it's just air in the lines because the drive motors groan a little sometimes like its low on fluid. I just moved it back and forth. Just not sure how to bleed the air out. Just don't want to do any damage.
Fluid good. Only a few months old. Cracked line fluid come out. ??? Still no liftIt really should bleed itself,. At least crack your pressure line with machine running,. It will make a little mess but make sure you have good flow. Does oil look milky white?
At this point I'll refer you back to our original post where I described how to put an inline gauge on the pressure side of the pump. If we don't know the pump is making pressure it's hard to troubleshoot.Fluid good. Only a few months old. Cracked line fluid come out. ??? Still no lift
Zero pressure at the aux port.At this point I'll refer you back to our original post where I described how to put an inline gauge on the pressure side of the pump. If we don't know the pump is making pressure it's hard to troubleshoot.
Sounds like the pump is not working to me, pull pump and double check your pump drive shaft and coupler. The coupler should have a little snap ring retainer holding it in. Make sure the splines and shaft are in good condition. If she ain't turning she ain't pushing.Zero pressure at the aux port.
I'll pull it the 1st of the week. I cracked the line to the control valve and fluid come out but no pressure. Tricky trying to check things with the cab up. Machine like to creep. I ran it up and down the drive today and all of the air seems to be out of the drive pumps. My "rebuilt" pump must be bad or just won't prime. It worked before they rebuilt it, just weak. Thanks for the help from everyone.Sounds like the pump is not working to me, pull pump and double check your pump drive shaft and coupler. The coupler should have a little snap ring retainer holding it in. Make sure the splines and shaft are in good condition. If she ain't turning she ain't pushing.
What if the seal was leaking between the main drive pump and the lift pump. The drive works good but not sure if the drive pump gets it's oil supply through the lift pump. Going to check with my re builder Monday. He said it was a vane pump but according to my serial # it should be a gear pump. Maybe it's been changed ?I'll pull it the 1st of the week. I cracked the line to the control valve and fluid come out but no pressure. Tricky trying to check things with the cab up. Machine like to creep. I ran it up and down the drive today and all of the air seems to be out of the drive pumps. My "rebuilt" pump must be bad or just won't prime. It worked before they rebuilt it, just weak. Thanks for the help from everyone.
What is your serial number and do you see any marking or numbers on pump? The hydraulic pump, either vane or gear, supplies the hydrostatic pumps with oil, this is called charge pressure and replenishes the drive oil. you can check the charge pressure by removing charge pressure sensor and installing a gauge. Depending on serial number charge pressure can be any where between 80-115 PSI.What if the seal was leaking between the main drive pump and the lift pump. The drive works good but not sure if the drive pump gets it's oil supply through the lift pump. Going to check with my re builder Monday. He said it was a vane pump but according to my serial # it should be a gear pump. Maybe it's been changed ?
Is the charge pressure sensor the one on top of the rear pump. I see another sensor (not wired) on the block with the feed/supply from the oil tanks. Ser # is 151xxxxWhat is your serial number and do you see any marking or numbers on pump? The hydraulic pump, either vane or gear, supplies the hydrostatic pumps with oil, this is called charge pressure and replenishes the drive oil. you can check the charge pressure by removing charge pressure sensor and installing a gauge. Depending on serial number charge pressure can be any where between 80-115 PSI.
It's the one on the port blockIs the charge pressure sensor the one on top of the rear pump. I see another sensor (not wired) on the block with the feed/supply from the oil tanks. Ser # is 151xxxx
Pulled the pump, again, and took it back to my "re builder". See what happens.May end up just replacing it. Looks like LPS has them for $553.12 plus shipping.It's the one on the port block
Got pump back from my alleged re builder. He said they reversed something but now it should work. Reinstalled pump but still doesn't lift. Still trying to get all of the air out of the pumps and drive motors.Pulled the pump, again, and took it back to my "re builder". See what happens.May end up just replacing it. Looks like LPS has them for $553.12 plus shipping.
Still doesn't lift. Need to get some fittings together to check charge pressure. Where does the charge pressure come from and what does it do?Got pump back from my alleged re builder. He said they reversed something but now it should work. Reinstalled pump but still doesn't lift. Still trying to get all of the air out of the pumps and drive motors.
Charge pressure is supplied by the implement pump, the pump your having issues with. Charge pressure supplies the drive pumps with oil, keeping it simple here. Your charge relief should be set between 85 and 115 PSI depending on your serial number. Your drive pumps work in a loop and needs charge pressure to replenish the oil to the drive pumps. Charge pressure won't keep you from lifting or tilting but it's easy to check by plumbing to charge pressure sensor port and look for pressure. The pump supplies flow, restrictions create pressure. If you can remove the main pump hose from valve body and connect another hose to it long enough to reach to the tank, start the machine and see how much flow you have, should be like a strong water hose flow. I think you said it was hard to do because your machine creeps, raise the machine put it on jack stands start the machine and check the flow. You don't have to connect a high pressure hydraulic hose to do this, again the pump creates Flow restriction creates pressure as long as there's no restriction going back to tank you should not have high pressure. I still think you're going to need a new pump howeverStill doesn't lift. Need to get some fittings together to check charge pressure. Where does the charge pressure come from and what does it do?
Got machine on jack stands and connected hose to pump output. Pumps fluid but no pressure when re-connected. Ordered new pump from Loader Parts Source. Should be here Monday.Charge pressure is supplied by the implement pump, the pump your having issues with. Charge pressure supplies the drive pumps with oil, keeping it simple here. Your charge relief should be set between 85 and 115 PSI depending on your serial number. Your drive pumps work in a loop and needs charge pressure to replenish the oil to the drive pumps. Charge pressure won't keep you from lifting or tilting but it's easy to check by plumbing to charge pressure sensor port and look for pressure. The pump supplies flow, restrictions create pressure. If you can remove the main pump hose from valve body and connect another hose to it long enough to reach to the tank, start the machine and see how much flow you have, should be like a strong water hose flow. I think you said it was hard to do because your machine creeps, raise the machine put it on jack stands start the machine and check the flow. You don't have to connect a high pressure hydraulic hose to do this, again the pump creates Flow restriction creates pressure as long as there's no restriction going back to tank you should not have high pressure. I still think you're going to need a new pump however
Lets hope that fixes your issue. Ensure the pump outer part goes on the right way, you will notice there is an arrow, this shold face the rotation of the shaft as the engine spins it. So from memory, looking at the pump from the bucket, the arrow should point to the left. If it's backwards, you will not get flow.Got machine on jack stands and connected hose to pump output. Pumps fluid but no pressure when re-connected. Ordered new pump from Loader Parts Source. Should be here Monday.
Please check that i have the rotation correct, the engine should turn clockwise, so the shaft at the pump looking from the bucket should be ani-clockwise.
Good luck, the people at LPS are good to work with.
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