Tighten clamp base on Gamme 6900els

Herb

Semi-Pro
Take it out of the track and there is a nut underneath. You may be able to get to the nut through a whole on bottom side of turntable
 

chrisingrassia

Professional
I'm glad someone asked this question. I have a 5800ELS and my bases are getting to the point where in order to lock them with the lever I've gotta crank the lever like 85-90% of the way. But if I try to tighten that nut on the bottom even just a fraction of a turn.....I'm talking like a 1/16th of an inch.....the base seizes up and doesn't glide. I've tried tinkering with the insides of the base clamps (taking cover off, turning the allen head inside CW and CCW), but the result is always the same. How do we fix this? Any ideas?
 

jim e

Legend
Not sure on your machine, but on mine, there is an opening side of base clamp with a little plug that covers that opening .
Rotate the clamp with the opening to about 90 degrees to the rail, open the plug and insert a metric hex wrench, I forgot size, maybe a 3 mm or so.
For wrench to fit you have to be at that 90 degree spot.
Turn clockwise a fraction of a turn and try the lever until it operates how you like.
Turning clockwise decreases the amount you need to push lever to secure base, turning counter clockwise increases the amount that you need to push the lever.
There is a spring in the base that over time needs to be replaced and if does not operate properly may be necessary.
Possibly yours may be different but many do work like mine as described here.
 

TennisCanada1

Professional
Take it out of the track and there is a nut underneath. You may be able to get to the nut through a whole on bottom side of turntable
Thanks for your response. So I have to unscrew those 4 screws in the centre of the turntable to remove it from the track?
 

TennisCanada1

Professional
If you find you have to adjust that lock nut often you may want to replace it. They are not made to go on and off as the nylon wears out. Another option is to put loctite on the threads.
This was my first time having to tighten it, but hopefully the last. Thanks for the input! Cheers
 

struggle

Legend
Most adjustments should be made with the hex screw on the side of the clamp. If that is not enough then you'll need to tighten the nuts underneath.
 

chrisingrassia

Professional
If you find you have to adjust that lock nut often you may want to replace it. They are not made to go on and off as the nylon wears out. Another option is to put loctite on the threads.
This is very good to know. I was actually thinking a couple days ago this may be my exact problem. Given the proprietary threading of the Gamma casters I had to buy, I'd guess those nylon nuts have proprietary threading too.
Loctite is a bad idea IMO.
 

Irvin

Talk Tennis Guru
This is very good to know. I was actually thinking a couple days ago this may be my exact problem. Given the proprietary threading of the Gamma casters I had to buy, I'd guess those nylon nuts have proprietary threading too.
Loctite is a bad idea IMO.
Loctite on locknuts is a bad idea for sure. I would use regular nuts with loctite. Also loctite comes in different grades. I believe the blue is removable, you don’t want permanent. I used (recommended by Babolat) loctite on my clamp bases nuts and have not had an issue in over 1,500 string jobs on a used machine that was needing adjustment every few jobs.
 

chrisingrassia

Professional
Loctite on locknuts is a bad idea for sure. I would use regular nuts with loctite. Also loctite comes in different grades. I believe the blue is removable, you don’t want permanent. I used (recommended by Babolat) loctite on my clamp bases nuts and have not had an issue in over 1,500 string jobs on a used machine that was needing adjustment every few jobs.
I gotta figure something out soon, I'm getting tired of adjusting every 15 racquets.
 

Gamma Tech

Professional
The 17mm lock nut has a nylon insert that helps secure the threads. It sounds like the nylon insert has broken down and is no longer providing friction between the threads. I can send you a replacement.
 
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