| Author |
Message |
michaelthuber (Mikehuber)
New member
Username: Mikehuber
Post Number: 16
Registered: 3-2003
| | Posted on Tuesday, May 13, 2003 - 2:20 pm: | |
The Award goes to Andy. I took the cable and motor apart and found that the "grease" had become more like plastic. I scraped all of the hard junk out of the worm drive and the cover, replaced it with new lithium grease.I also re-aligned the cable and adjusted the cable mounting points so the cable has the same tension wether the window is up,down, or in the middle of travel.I put it all back together, and it works now.
By the way the pulley on the motor turns 2.75 revs/window travel. Even with the enormous reduction on the worm drive it doesn't equate to hundreds of revs for the motor.
Mike |
Andrew A. Illes (Andyilles)
New member
Username: Andyilles
Post Number: 7
Registered: 10-2002
| | Posted on Thursday, May 01, 2003 - 11:42 am: | |
Dear Mike;
Kurt is correct, it's not likely to be a motor problem, per se. In the following order, I would look for 1) a kinked cable (it doesn't take much); 2) misaligned pulleys (do you see any lateral movement when the window sticks?); 3) A burr or nick on the motor's "drive spool"; 4) hardened grease in the motor/drive.
Good luck. Andy |
Kurt Kjelgaard (Kurtk328)
Junior Member
Username: Kurtk328
Post Number: 192
Registered: 3-2001
| | Posted on Thursday, May 01, 2003 - 8:54 am: | |
Mike, the motor turns several hundreds of revolutions a minute and that would mean slowing down just as many times, not only two as you are experiencing.
I believe your Nissan fix can be attributed the fixing of the bind in the window, as you describe, and not to the cleaning of the commutator.
Keep us informed - we are all learning.
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michaelthuber (Mikehuber)
New member
Username: Mikehuber
Post Number: 12
Registered: 3-2003
| | Posted on Wednesday, April 30, 2003 - 9:47 pm: | |
I have followed all of the slow window fixes on this site for along time now, trying to develop a strategy to fix the slow windows on my Mondial Cab. I have identified a new problem. I took off the door panels, took the console out and started with the fix of cleaning the switches and connectors with contact cleaner. I can get 11.25V between the leads from the door to the window motor, through the switch and wiring, if the motor is unplugged. I lubed up all of the pulleys with WD40 and lubed the window tracks with silicone spray to cure any mechanical binding. However when I plug the motor back in I get a varying voltage reading between 11V and down as far as 6V between the two leads as the window raises or lowers. The voltage falls off at the same two points in the window travel, the window slows way down and the motor starts heating up. It struggles to keep the window moving then it gets past the bad spot and speeds back up again until it hits another bad spot. This happens at the same two spots regardless of whether the window is raising or lowering. I watched the rocker cable tensioner as the voltage dropped and it did not move. I then grabbed the top of the window and pulled it up and pushed it down to the full travel of the rocker tensioner. There was no mechanical binding. The window moved freely. I have seen this problem before. I believe the motor has one or more burned spots on the commutator. The motor powers a closed loop cable. If the cable doesn't slip or the tensioner does not move during the length of the window travel, it means that the commutator is always in the same position relative to window travel. This probably happened as a result of having a mechanical bind in the past at one of the two slow points . I plan to take the cable off and run the motor to see if the problem is present without load and make sure that I can move the uncabled window up and down through it's entire travel without binding. I expect the motor will flucuate in speed.
I saw this same problem a few years ago in a Nissan 300 ZX. I was able to fix that problem by taking the motor out, pulling it apart and cleaning off the commutator where it had arced,arched, or whatever, and burned at the point where the window was binding. I fixed the bind in the window put it all back together and never had another problem..
If I can get this motor apart I plan the same fix. If not it looks like either new motor time or living with a window with two slow spots. |
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