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Old 03-29-2017, 01:05 PM
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Default Allison oil pump assemblies

Just curious how many people have seen pump failures and how many times have you seen it?

I have seen 5 in the past 2 years and they have all been random except one which was junk right out of the Allison box.

Just curious on numbers.
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Old 03-29-2017, 01:10 PM
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The 6 speeds are hard on pumps. 5 speeds not so much.
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Old 03-29-2017, 01:12 PM
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Reason for failure?
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Old 03-29-2017, 01:20 PM
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Quote:
Originally Posted by JDPlowboy View Post
Reason for failure?
Don't really see a reason. Probably cheaper metal on the six speed pumps.
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Old 03-29-2017, 03:04 PM
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Don't really see a reason. Probably cheaper metal on the six speed pumps.
Do you replace them on standard builds?
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Old 03-29-2017, 03:28 PM
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I replace them when they are bad.
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Old 03-29-2017, 05:36 PM
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My 5 speed with 172k miles was bad when Mike rebuilt my trans for me last month. He showed me pump. Interesting I must say though in regards to 6 speeds.

Mike, do the trans show or have a telltale sign when pump is wearing out? I figure line pressure is dropping so would it show up as constant higher values in the TAP cells then normal? Longer engagement times? Flares?
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Old 03-29-2017, 07:44 PM
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It takes a trained eye to see a pump that is about to go out. They will transfer metal from one side to the other.
Pump gears are made of sintered metal ( powdered steel compressed ) This makes a better bearing surface for better wear. Kinda like babbit bearings on the crank minimizing wear. The pump gears are harder and are prone to gaul ( transferring metal from one side to the opposing side ) Once you see the slightest gauling; your pump is done.
Wonder how many alli's have been built with weak ass pumps that are about to grenade.
Wonder why you have weird problems after a so called build? Throwing a clutch pack into the trans will put you back on the same road of disaster as you are trying to fix. you must look deeper.
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Old 03-30-2017, 12:35 AM
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Had a bad pump in a 5 speed that ate a c2 clutch. Pretty obvious grooves everywhere. Surprised that the contaminates from the clutch pack were enough to damage not only the pump housing but the pump gears, had to replace the whole thing.
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Old 03-30-2017, 12:27 PM
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Quote:
Originally Posted by Mike L. View Post
It takes a trained eye to see a pump that is about to go out. They will transfer metal from one side to the other.
Pump gears are made of sintered metal ( powdered steel compressed ) This makes a better bearing surface for better wear. Kinda like babbit bearings on the crank minimizing wear. The pump gears are harder and are prone to gaul ( transferring metal from one side to the opposing side ) Once you see the slightest gauling; your pump is done.
Wonder how many alli's have been built with weak ass pumps that are about to grenade.
Wonder why you have weird problems after a so called build? Throwing a clutch pack into the trans will put you back on the same road of disaster as you are trying to fix. you must look deeper.
It's amazing how many components we have in our vehicles that are made from powdered metal.
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