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Old 10-19-2014, 09:32 PM   #1
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REMCO pump

We have a REMCO pump so we can pull our Lexus four down. There appears to be a short somewhere. I have already checked the ground for the unit. When we first start up it is quiet until after we go down the road for 30 minutes or so, then we start getting an intermittent humming, which builds up to a continuous humming. In the past when we stop to check the humming would stop, I would go back to make sure the pump was still working and attempt to make sure the tow cord connections were tight and we could proceed down the road. Now the humming still stops, the pump is running, but the tightening of the connections does not remove the problem. I purchased a new 6 pin to 6 pin cord, no benefit. Would appreciate any direction on what to do or replace.
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Old 10-19-2014, 09:46 PM   #2
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If by humming , you mean the Remco control module alarm. You could be having pressure drop in the pump system due to low fluid supply to the pump, or transmission fluid foaming.
The pressure drop is the trigger for the alarm.
Has this problem just developed ?
Or was the system just installed?
At a Remco shop , or Lexus dealer?
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Old 10-19-2014, 09:56 PM   #3
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Quote:
Originally Posted by Skip426 View Post
If by humming , you mean the Remco control module alarm. You could be having pressure drop in the pump system due to low fluid supply to the pump, or transmission fluid foaming.
The pressure drop is the trigger for the alarm.
Has this problem just developed ?
Or was the system just installed?
At a Remco shop , or Lexus dealer?
It has been off and on for the last three months. But would go away.

This is my second pump as the first pump leaked. The second pump was replaced by an auto mechanic in January of this year The same mechanic also installed a new transmission. The old pump was on the new transmission for a month.
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Old 10-19-2014, 10:06 PM   #4
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If the first pump never gave you the alarm on the new transmission, and the problem has only developed with the new pump, flow pressure of the new pump is in question, or defective low pressure sensor.
I'd call Remco with the details of your problem. See if they will supply a new pump or sensor.
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Old 10-20-2014, 06:36 AM   #5
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I have the Remco Lube Pump and I would NEVER call the alarm sound a "Humming"

Where are you hearing this hum? Is it inside the RV or is it beside the car. The unit does make some noise when its running and I can hear it when I stand beside the car.

But there should be no sound inside the RV, no sound at all.

How it works.

Power is supplied to the pump, the pump creates pressure in the hoses, this operates a pressure switch.

The control unit in the RV sends power to the pump, it also detects the state of the pressure switch. It also senses the presence of the pump so it will alarm if

1: Fuse blows (Pump power)
2: Car attached pump turned off inside RV
3: Car not attached and control inside RV ON
4: Problem with pump. (Pressure not detected).

You could have a bad pressure switch.

Side note: WHen mine was installed it passed all tests in the shop, both motor home and car.. When we plugged in the cord to connect them it was a serious case of fuze-us popp-us It blew the fuse instantly.

Turns out the problem was the 6 pin cord. Must have been a monday job. Dealer fixed.
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Old 10-21-2014, 12:56 PM   #6
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I'm confused too. How do you hear the pump hum when you are in the coach driving and the pump is back in the toad? What is it that is humming? Seems like it has to be the remote pump alarm, or something other than the Remco pump that is making the noise.
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Old 10-21-2014, 06:35 PM   #7
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Thank you for everyone’s response. To bring you up to date. We checked the transmission fluid and it was full. Which we later found out should have been about a pint down. We hooked up the car in Holbrook ,AZ and as usual I run the car while doing the hook up. Whoops, left engine on in neutral when we left. No buzzing except when we slowed to a stop and then just for a little while. Discovered the engine was on and turned it off. Got back on I40 and the buzzing was back. Pulled over started up engine and went quietly to the Central KOA in Albuquerque. Next morning took to Tom’s Service and Sales as recommended by REMCO. They checked the pump and car connections and pressure and found nothing except the fluid needed to be reduced. Took for a test run and the buzzing was still there. They started following the wiring on the MH side and found a ground wire that with a light touch fell off and the 6 pin plug at the MH had issues and they replaced and fixed. They did regularly comment about why did Smitty’s do the setup that they did. Took for a test drive and the buzz appears to be gone. Tommorrow will be back in Texas and Friday back at Rayford Crossing. Tom was great to work with, letting us use his car to do some sightseeing in Albuquerque. Appeared very professional and his fee was reasonable. (Assuming the buzz is gone)
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Old 10-22-2014, 11:52 AM   #8
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On of the problems I had with my Towed install was the ground, on the motor home end

The dealer used common Scotch Lock Brand connectors to splice into the leads for my flat 4 connector for RT/LT/STOP lamps, Tail and Ground, Theory has it this should have done the job.

Suddenly my turn signals did not work properly with the headlights on Symptoms of a bad ground.

I re-did the Motor Home end of the wire and it worked.
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