JustinG
Well-Known Member
Can anyone look up the part number for the scavenge pump for the TC? S/N is 86j4873
Thanks,
Justin
Thanks,
Justin
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Need help with 951C part
- Thread starter JustinG
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kshansen
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I'm not seeing a pump referenced as a "scavenger pump" just this one:
JustinG
Well-Known Member
How many pumps are in these transmissions?
Don't think these have a scavenge pump, torque is in transmission.
Bob
kshansen
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Attaching a few pages out of the "Systems Operation" section of manual showing the power-train components.
JustinG
Well-Known Member
Having a issue with the transmission getting hot after an hour of operating. Already ruled out the thermostat before cooler and cooler was cleaned when I had radiator out. I was told they have a pump to keep the converter from filling up and that it might be bad. I've never messed with the transmission on it so I really don't know.
Old Magnet
Senior Member
If it's not the oil cooler, low transmission oil pump flow from a worn out transmission pump will cause overheating. Pump pressure should be 275psi minimum, Max 305 +/-15 psi.
Check pressure at pump or filter cover.
Also check suction screen in the transmission.
Check pressure at pump or filter cover.
Also check suction screen in the transmission.
Last edited:
JustinG
Well-Known Member
I'll check the pressure and see what it is. I had the suction screen out 125 hours ago and it was clean. I noticed today that it has a noise and I believe it is coming from that oil pump location. The overheating has slowly gotten worse. I had put a new temp gauge in when I checked the screen. When it runs hot, the inlet line running to the cooler reads around 250 degrees F with temp gun. It doesn't get sluggish though, still shifts & pulls fine.
kshansen
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Correct, not like some Cat applications the Converter is inside the same housing as the transmission so there is no need for the scavenger pump like on say a D6C.
kshansen
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Okay, below are the sections out of the Cat manual on trouble shooting referencing over heating converter and transmission:
Old Magnet
Senior Member
Odd that they leave out checking the transmission suction strainer. Fairly common source of flow problem. I guess that's what comes from universal trouble shooting literature that is not model specific. Plus old stuff!!!!
kshansen
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Very true! That should have been one of the sub-steps under #7 Not enough oil to torque converter.
And actually #7 might have been better if it had been #1 on the list as I always tried to do most of my trouble shooting starting with two ideas. Start with the easy things to check and then with the cheap things to check.
Sometimes being lazy and a tightwad is the best place to start from when trouble shooting a problem.
JustinG
Well-Known Member
Check pump pressure at filter housing, 100 psi at WOT. Guess I'll pull the pump and see what kinda damage it has, if any. I'm going to pull the screen and filter also.
JustinG
Well-Known Member
Old Magnet
Senior Member
If clearance between the cover and the gear face is 0.004" or more pump is shot.
JustinG
Well-Known Member
Measuring .007"
Old Magnet
Senior Member
Definitely qualifies as worn out. New is 0.001" sometimes less to 0.003"
Gear tip to housing clearance is 0.001" to 0.002" (also worn out at 0.004")
Gear backlash should be about 0.020" Max although that's not all that critical
Gear tip to housing clearance is 0.001" to 0.002" (also worn out at 0.004")
Gear backlash should be about 0.020" Max although that's not all that critical
Last edited:
kshansen
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While I will not doubt that the pump is worn out and needs to be replaced I still have to wonder if there isn't some other problem.
I know I would be checking the suction side of that system very close for either a suction leak or some kind of restriction.
Also if on start-up with new pump it does not jump up to 300 psi in a matter of a few seconds I would be looking for another problem. Say the control valve that regulates the oil pressure.
I know I would be checking the suction side of that system very close for either a suction leak or some kind of restriction.
Also if on start-up with new pump it does not jump up to 300 psi in a matter of a few seconds I would be looking for another problem. Say the control valve that regulates the oil pressure.
Old Magnet
Senior Member
Be sure to fill/prime the pump with oil before start up.
DMiller
Senior Member
I cheat on a dry startup replacement pump, I pack the pump with lubriplate or similar grease.