B7800 Waterpump  overheating problems: Kubota Review  -- Kubota Tractors Discussion Forum and Review B7800 Waterpump overheating problems: Kubota Review -- Kubota Tractors Discussion Forum

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 08-31-2008, 15:15 Post: 156424
czrider



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 B7800 Waterpump overheating problems

Hi, Haven't been on the boards in ages...I found TractorPoint a several years ago when shopping for a compact tractor...had to re-register as I forgot my original userid, etc.
My question pertains to recurring cooling system problems on my 300 hour B7800 tractor My problems started a couple of years ago when the tractor had around 160 hours and was just beyond the 3 year warranty period. My wife had been mowing for several hours when the tractor shut down on her. I investigated and found the radiator completely dry. I re-filled the cooling system, restarted the tractor and was very relieved when everything seemed OK. I discoverd, the next time I used the tractor that the waterpump was weeping coolant from the hole underneath the impeller shaft. My theory at the time was that the tractor overheated due to chaff blocking the airflow causing the tractor to overheat and boil off all the coolant - my wife is not real good about watching the gauges. At the time of this first overheating incident, she was mowing ~4 inch fescue, not hard mowing at all, but she had been at it for at least 4 hours or more. I attributed the waterpump failure to running dry, I now suspect that the waterpump was the culprit all along.
I replaced the pump with a new part from the dealer, flushed and re-filled the radiator with a 50-50 mix of coolant. Since the initial incident, I have religiously cleared the chaff from the grill and removeable screen in front of the radiator after ever hour or so of mowing; I have noticed that the temperature guage does drop a bit after clearing the chaff.
I counted my blessings that my tractor had apparently escaped major damage from being run without coolant. Yesterday, I found that my cooling problems were not over. The tractor started heating up on me during some very easy mowing. I checked and found that the new, $160 waterpump was sling coolant from around the shaft again!
Has anyone else experienced similar problems? I cannot believe that these waterpumps routinely fail after 150 hours or so. My dealer said he has only sold this particular waterpump on high hour excavators, which, apparently use the same pump. I would appreciate any advice as to why this is happening. I would also be interested if anyone has a source for aftermarket waterpumps that are not so pricey. Thanks in advance for any advice. Jim






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 08-31-2008, 15:36 Post: 156425
harvey



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 B7800 Waterpump overheating problems

With luck like that I would not got to Vegas this year.

I have seen new pumps fail also but it's rare. I'd whine at dealer. I'd also be concerned about the quality of anti-freeze or the water you use to mix.

You are loosing waterpump seals. That is unusual given the hours.






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 08-31-2008, 15:41 Post: 156426
czrider



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 B7800 Waterpump overheating problems

Harvey,
I do intend to whine a little at the dealer sometime next week. As to the type of coolant; I used Prestone mixed 50/50 with well water...the same coolant and water used in all our cars & trucks as well as my old 2240 John Deere. I may use the pre-mix coolant next time, although I don't think my water is the problem. I'll let everyone know how I make out with the dealer.






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 08-31-2008, 17:41 Post: 156430
earthwrks

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 B7800 Waterpump overheating problems

Are you using well water in the radiator? Possibly sand is contaminating it and wiping out the seal.






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 08-31-2008, 21:26 Post: 156433
czrider



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 B7800 Waterpump overheating problems

I really don't think my well water is the problem. I've run the same coolant mix in all my vehicles with no problems. My well water was not a factor with my first water pump; it failed before I replaced the factory coolant. I have to believe that this is just a strange coincidence. I am very meticulous when it comes to maintaining my equipment. Maybe the third time's the charm, and I will not have any more issues....I'll see after another 150 hours, I guess.






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 09-02-2008, 06:15 Post: 156439
czrider



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 B7800 Waterpump overheating problems

I should also point out that the bearings on both waterpumps were still tight as a drum; no play what-so-ever when you grabbed & wiggled the the fan blade. It's almost like something in the coolant is eating up the seals. While my well water has been called into question, it was not a factor on the original pump, and has not harmed any of my other vehicles or equipment.






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 09-02-2008, 06:33 Post: 156440
earthwrks

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 B7800 Waterpump overheating problems

As a homeowner I realize it seeming takes awhile to rack up 150 hours. Howvere as a business 150 hours would put you reaplcing a pump less than once a month--which no matter how you cut it is totally unacceptable.

Knock on wood, wit6h all the equipment I have or had, I have never replaced a water pump or alternator. Hydraulic pumps and batteries, yes.

Have you considered an over-the-counter coolant lubricant additive? Some coolants I have heard are actually abrasive since they have silica in them.






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 09-02-2008, 08:35 Post: 156442
kthompson



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 B7800 Waterpump overheating problems

Check your air filter as it will also cause your engine to run hot if it needs changing.

As to the seal and your well water, you could always run some into a large clear glass jar and let it set and see if there is sand in it. As to both pumps failing, is there any way sand or debris could be getting into the overflow bottle (I assume your's is like my B2710) or could the radiator cap not be sealing fully? kt






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 09-02-2008, 17:08 Post: 156453
earthwrks

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 B7800 Waterpump overheating problems

Kenny raises a good point about the radiator cap but my thinking is from a different perspective.

Is it possible that both the thermostat AND the radiator cap are defective? I'm thinking that elevated temperatures from a bad stat combined with a cap that isn't relieving might be casui9ng excessive heat and pressure that the pump seal can't withstand. Or it is withstanding it but the increased pressure is causing premature wear. Just a thought.






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 09-02-2008, 17:31 Post: 156454
kwschumm



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 B7800 Waterpump overheating problems

If that water pump is belt driven could the pulley be bent, out of round or the mounting holes drilled a bit off-center? That might cause extra vibration that prematurely wears out the seal.






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