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Cassese CS89 Underpinner Issues..

Echobelly

Grumbler in Training
Just started work at a frame shop using this machine, one day overlap with previous framer. Have never joined with one of these machines but love it. I was quickly shown how to use it, but noticed that after stapling, I would occasionally have to hit the "Emergency Stop" button to set the next staple. I asked about that and was told "It's been starting to do that". Now I have to hit it everytime. The pressure is at 6, and I can't find anything in the manual addressing this. Any suggestions? I'm not even sure what the Emergency Stop button is used for....
 
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Scott Lewis

Grumbler
Look at the mechanism from below. There’s a little button that’s supposed to be bumped by a pin that has a spring around it. Sometimes the nut loosens and the button drifts out of alignment. Try realigning the button, or adjusting the spring. In this way I’ve been able to cure this problem.

The red button is doing just what it’s supposed to by relieving the air pressure when the button doesn’t get bumped.

Good luck!
 

Echobelly

Grumbler in Training
Thanks! I think it does have something to do with the limit screw. I adjusted it according to the manual (I think, not very detailed) and now the plunger is stuck in the up position. I've shut off the air but it still won't lower. I can't get to the limit screw to try to adjust it back to where it was with the plunger in the raised position. At least before I could still build a frame....
 

Scott Lewis

Grumbler
Thanks! I think it does have something to do with the limit screw. I adjusted it according to the manual (I think, not very detailed) and now the plunger is stuck in the up position. I've shut off the air but it still won't lower. I can't get to the limit screw to try to adjust it back to where it was with the plunger in the raised position. At least before I could still build a frame....
If your plunger is stuck in the up position, you probably have a wedge jammed in the distributor block. Follow instructions on p. 10 of the manual, which is available via a quick google search if you don’t already have it.
 

Echobelly

Grumbler in Training
Thanks for your help! Unfortunately, after adjusting the limit screw (no mention on which way) I tested it, and the presser came down on the wedge hammer and bent the top of it, that's why the plunger wouldn't drop back down. Tried to remove the wedge hammer to replace according to the manual without success. Now that machine's out of service. The owner of the shop is looking for a mechanic to fix it. I'm in the process of trying to figure out how to use the back-up thumbnailer, which seems pretty simple, except the stops aren't set right, as it's routing out grooves much wider than the plastic plugs. This seems to be how most of my days are spent!
 

David Hewitt

CGF II, Certified Grumble Framer Level 2
The machine is extremely sensitive to any and all adjustments. I recommend to try and get back to your original settings when you started to make corrections.
Disconnect the wedge drive pin,(V Shape) now remove the steel block assembly that houses the drive pin. Take it apart and clean well. Grease (with high pressure bearing grease) the areas that the drive pin touches. Install a new wedge drive pin and grease it as well.
Reassemble the block and install it back in the machine, going over the drive pin, and make it flush with the top of the sliding assembly.
Now try out the machine. You may need to fine tune the button that you started with (post #2}. Note that when making the spring adjustment count your turns as even a 1/4 turn can make a difference.
In the future, every few days brush some grease on the areas that the drive pin travels and keep that area clean.
 
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