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zbiggreen 
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Joined: 13 May 2015
Location: United States
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 Topic: 7010 gear pump
Posted: 28 Apr 2019 at 7:50am |
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Hi,
A few weeks ago I fixed the spring on the detent of my powershift 7010. As I was pulling it out of shop, the power steering went. Went through this o e other time and knew it was the gear pump. Found a key sheared and the gear cracked. Found a new/used housing, new/used input shaft, and seal kit. Installed it, filled with oil, and tested. It worked for about 20 seconds and then went again. And this is the second pump that went in less than 200 hours.
If a new aftermarket pump wasn't over 4 grand I would go that route. All my usual parts channels doesn't have a used pump in stock. Anyone know where I could possibly find a good one? Also hang ideas on why this pump keeps going?
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pirlbeck
Silver Level
Joined: 01 Dec 2009
Location: West Central IA
Points: 229
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Posted: 28 Apr 2019 at 8:51am |
If the part number you are looking for is a 70271875 which is a complete dual pump assy there are a number of salvage yards that show them. There are a couple of more shown in Canada if you strike out at these places.
 | 660-885-2287 | |  | 207 N.W. 160 Clinton, MO 64735 |
Wengers of Myerstown - Ag Division | 800-451-5240 | |
| 814 S. College Myerstown, PA 17067 |
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DrAllis
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Joined: 12 Sep 2009
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Posted: 28 Apr 2019 at 9:24am |
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I think you need to determine WHY those pumps are failing. If you think that is a normal kind of thing, you are wrong. There are thousands of those dual pumps out there from 1973 thru 1985 that have never had anything done to them. Why have you failed THREE??
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zbiggreen
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Location: United States
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Posted: 28 Apr 2019 at 1:10pm |
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When we bought tractor used, it seemed to last for about 100 hours, then it went the first time. Found that the strainer that is supposed to be on/in suction filter was not there. Replaced all filters and inserted the strainer and also replaced the pump with a used one. That lasted about 200 hours then went again, not sure why, had plenty of oil. I am aware as long as gear pumps have oil they last a long time. That's why I'm dumbfounded with this. It is getting lots of oil.
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shameless dude
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Location: east NE
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Posted: 28 Apr 2019 at 1:34pm |
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sounds like your oil resivor (spelling) is contaminated
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DrAllis
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Posted: 28 Apr 2019 at 2:49pm |
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The gear pump (steering) doesn't get it's oil thru the strainer screen you access from underneath. That strainer goes to the gerotor (transmission) pump. The gear pump draws its oil thru the left hand differential filter that also should have a screen installed the end of the hydraulic filter. This screen must be transferred from the old hydraulic filter into a new AGCO filter when changing. Only AGCO filters work with these hydraulic systems.
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MACK
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Joined: 17 Nov 2009
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Posted: 28 Apr 2019 at 8:36pm |
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I'm with the Dr. on filter. I would drain rear end , take filter housing out and look inside for chunks then check filter housing for missing oring. If you find trash inside, remove core plug in front of surge chamber before something goes in piston pump. MACK
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Sanjv9473
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Joined: 07 Sep 2021
Location: India
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Posted: 07 Sep 2021 at 1:05am |
Gear pump A gear pump uses the meshing of gears to pump fluid by displacement. They are one of the most common types of pumps for hydraulic fluid power applications. The gear pump was invented around 1600 by Johannes Kepler. Gear pumps are also widely used in chemical installations to pump high viscosity fluids How does a gear pump work ? Gear pumps work by trapping fluid between the teeth of two or three rotating gears. Often, they are magnetically driven, which means they use less “wetted” materials for greater chemical compatibility. Gear pumps move a cavity that rotates rather than reciprocates. Efficient of gear pump Volumetric efficiencies of gear pumps run as high as 91 percent. Gear pumps have close tolerances and shaft support, usually on both sides of the gears. This allows them to run to pressures beyond 200 bar gauge (Barg), making them well suited for use in high-pressure applications. https://marinerspoint.in/gear-pump-working-types-constructions-parts-applications/
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MACK
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Posted: 07 Sep 2021 at 7:06am |
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Foreign material going through gears is most likely the cause of this type of failure. Recheck every thing in left filter housing. Have saw it happen, but very few times. MACK
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