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Electrical help needed.

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Richard And Babs Ames:
RVA tech tole me to clean out the switchs with contact cleaner (Radio Shack) and air pressure like the key board cleaners (dry air) can help prevent problems caused by dirt, dust and moisture.

Steve Adams:
Got the assembly back today. New electric motor, new solenoid (relay) and assorted electrical cables. It should be installed in the next day or so.

My plan is to install the assembly with the reservoir filled. My thoughts at that point are to run the motor intermittently with the reservoir cap off to bleed air in the lines as the fluid returns to the reservoir. Once it runs with no air detected I plan to run the slide in and the jacks up then top off the reservoir to the fill line. Is there a flaw in this plan?

Thanks, Steve

Gerald Farris:
Steve,
Your plan sounds like it is exactly the same way that I would do it.

Gerald

Keith Moffett Co-Admin:
Food for thought:
Hydraulic pump on the RVA system uses Dextron ATF.  So does the power steering.  I changed the ATF for the power steering per the manual.  I should have used a bucket and pumped new through the whole system because the mixed fluid is dark right away.  
Could this be a weak spot in the hydraulics for the jacks and perhaps further the burn out of the pump motor?  I dont see any reference to a complete fluid change in any manual.

Gerald Farris:
The pump for the power steering and hydraulic cooling fan motor runs anytime that the engine is running, and therefore the fluid in that system is subjected to continuous heat and wear that necessitates the filter and fluid changes.

 The hydraulic jack pump runs a very short amount of time in comparison to the power steering pump and therefore the heat that causes fluid breakdown is not a problem and no fluid change is necessary.

As for the idea about flushing the power steering system when you change the fluid, it would be better to remove all of the old fluid, but if it is not preformed properly, and you let the pump receive air you will do more damage than benefit. Since the fluid in the hoses is the only fluid that will be removed by flushing (the cooling fan would have to be engaged and the power steering would have to be fully turned both directions when flushing to remove all fluid) it is not recommended.

The best way to extend pump life is to use Allison Transynd fluid instead of Dextron. Transynd has a higher sheer strength and is more heat resistant than Dextron, but it is more expensive.

Gerald  

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