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(Topic ID: 150205)

TFTC VUK Issue (Resolved)


By GRB1959

4 years ago



Topic Stats

  • 24 posts
  • 12 Pinsiders participating
  • Latest reply 2 years ago by cheshirefilms
  • Topic is favorited by 2 Pinsiders

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#1 4 years ago

The VUK in the upper right corner of my TFTC is experiencing sporadic issues kicking the ball back up to the playfield. Sometimes it kicks the ball up on the first try without any problems and other times it takes 2, 3, 4, 5, 6 times or so until it is successful in kicking the ball up to the playfield.

Upon further inspection of the VUK/Coil assembly under the playfield there is quite a bit of slop when I wiggle the ball popper cap. I have attached photos of this VUK assembly below.

On the VUK assembly there are only two compression rings when the manual calls for 3 compression rings for this assembly. I am guessing that this may be the cause of the extra slop in the assembly.

I have ordered the following VUK component kit from Marco Specialties as it appears to have everything that I need to re-build this VUK on my TFTC.

http://www.marcospecialties.com/pinball-parts/565-0029-01

This kit also has 3 compression rings. I also checked the VUK on my JP which works basically 100 percent of the time and it too has 3 compression rings.

Do I need any type of special tool when installing the compression rings around the plastic ball popper cap to ensure that it is nice and snug and that everything works as it should?

Thanks.

Gord

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#2 4 years ago

Watching this topic , have the same issue in mine .. Good luck

#3 4 years ago
Quoted from transprtr4u:

Watching this topic , have the same issue in mine .. Good luck

This posted by user 'Capinball' in the TFTC club thread regarding this topic.

I'm having this issue as well and had bookmarked an old post by Russ Myers to tackle it. Looks like you got the right kit. Here are his tips:

"Mark (Band;No-Band) the wires on the VUK coil and de-solder.
Unscrew the 4 screws and pull the entire VUK assy out.
Buy the DE VUK rebuild kit from Marco (or elsewhere if you can find it)
http://www.marcospecialties.com/pinball-parts/565-0029-01

Vertical Up Kicker (VUK) Component Kit
#565-0029-01
Vertical Up Kicker (VUK) repair kit contains plunger, cup, spring, spring clip and roll pin.
Contains the following components:
545-5227-00 plastic cup
515-5352-00 plunger
266-5025-00 spring
270-5010-00 compression ring
251-5004-00 roll pin

Replace everything in the kit (it's only 18 bucks) and re-install

Make sure the sliding "mushroom" cap moves very freely up and down and is activating the arm of the microswitch properly. The mounting screws on the side of the assy have oval holes so you can adjust the angle a bit until it works smoothly every time. The hardest part is taking everything off (those spring bands are a PITA) and re-assembling in the correct order. Watch for the tapered spring under the mushroom cap - it has to go in the right way or it will jam.

The cap that catches the ball is supposed to slide smoothly down and activate the switch so the game knows the ball is there, but the parts wear and get wonky. I put the VUK rebuilds into most of the DE VUKs - it's just best for longevity.
The B/W design with a simple piston and an opto switch is superior, as is the later Sega/Stern Y-fork and piston.

RussMyers"

#4 4 years ago

I would also replace the coil sleeve too.

#5 4 years ago

I used this kit on my TFTC and still have the same issues. Adjusting does not seem to help much of anything. I've wondered if a stronger coil might be the answer.

#6 4 years ago

So while it is not TFTC, I had a similar issue on my gNr years ago when I first bought it. Did the rebuild, no dice.

Ended up having a flakey switch that had to be replaced/adjusted. If the cup didn't land on the switch just right, it would result in a half assed pop. Might want to try that out.

#7 4 years ago
Quoted from dsuperbee:

So while it is not TFTC, I had a similar issue on my gNr years ago when I first bought it. Did the rebuild, no dice.
Ended up having a flakey switch that had to be replaced/adjusted. If the cup didn't land on the switch just right, it would result in a half assed pop. Might want to try that out.

Thanks for the tip, I will try that.

#8 4 years ago
Quoted from dsuperbee:

Ended up having a flakey switch

Check wiring too. One of the wires to the VUK switch is the same color as to one that goes to your ball launch switch. The ball launch switch takes a beating, I'd check the wiring to it.

LTG : )™

#9 4 years ago

Thanks guys for all the helpful advice.

Gord

#10 4 years ago

In the pictures the cap itself does not look to be sitting straight. Is it attached properly?
Also the wire form is it attached properly and lined up with the hole on the topside?
Absolutely a new coil sleeve I would do the plunger and link as well as a new return spring if these are not already brand new.

Looks like a really clean copy from the couple pics you posted.

#12 4 years ago

Additional note:

Check the vertical wireform habitrail alignment. They get bent and misaligned.

#13 4 years ago
Quoted from Shoot_Again:

In the pictures the cap itself does not look to be sitting straight. Is it attached properly?
Also the wire form is it attached properly and lined up with the hole on the topside?
Absolutely a new coil sleeve I would do the plunger and link as well as a new return spring if these are not already brand new.
Looks like a really clean copy from the couple pics you posted.

My TFTC was recently restored and everything was rebuilt including this VUK. However there are only two compression springs installed and not 3 like there should be. I have mentioned that there is quite a bit of slop in the ball popper cap and that is what you are seeing and it is also what may be the cause of this intermittent issue.

The wireform appears to be lined up correctly as this VUK works correctly most of the time. I believe that the slop which may be due to the missing third compression ring may very well be the cause of this intermittent issue.

Do I need a special tool to install and tighten the missing third compression ring? All other parts on this VUK are as new. Parts have been ordered.

Thanks for your comments.

Gord

#14 4 years ago

You don't need a special tool. Use a small flat head screwdriver or knife to push the compression rings up or down to expose the pin that holds the cap assembly to the shaft. Then just use something to push the pin out. Reverse to reassemble.

Make sure you have the right coil sleeve. You need the one with the ledge or whatever it's called.

#15 4 years ago
Quoted from luckymoey:

You don't need a special tool. Use a small flat head screwdriver or knife to push the compression rings up or down to expose the pin that holds the cap assembly to the shaft. Then just use something to push the pin out. Reverse to reassemble.
Make sure you have the right coil sleeve. You need the one with the ledge or whatever it's called.

Thanks, will do.

Gord

#16 4 years ago

Hope that does it.
If wire form is in the proper location up top and the solenoid is working smooth down below. The cap or ball cup will change the alignment by miles with just a little movement.

#17 4 years ago

I received the VUK rebuild kit today from Marco Specialties and installed a new ball popper cap with 3 new compression rings. Previously my VUK only had two compression rings installed. After installing the 3 compression rings this did remove a good deal of the slop that the ball popper cap was experiencing.

I have since played approximately 75 games with 100-125 or so successful VUK launches and no failed launches. I also took the glass off and fed the ball to the VUK several times (20 or so) and the VUK now kicks the ball out nice and strong every time.

Previously the VUK would sometimes take as many as 9-10 unsuccessful tries before the VUK would finally successfully kick the ball out. Thanks for all the comments.

Gord

#18 4 years ago

Sweet glad you got it working right again.

Thanks for posting the resolution for others who might have the issue.

1 year later
#19 3 years ago

grb1959 - do you have a pic of the final outcome? I'm having issues as well... but I have three compression rings.

But the rings seems loose and the ball pop cap seems to sway back and forth (not shooting the ball up straight)

Not sure if everything needs tightening or replaced. A pic may help with my dilemma

Thanks!!

#20 3 years ago

You should have 3 spring steel rings there really not that important, but the dowel may have been installed wrong those look a lot like the Marco ones that have a tiny little hole you need to pre-drill out with just the right sized bit before pressing in the metal dowel for a tight fit.

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#21 3 years ago

I think my compression rings may need tightening. I can see the shaft of the ball cap under them. They are barely tight and I think this may be causing the issue. Thanks!

#22 3 years ago

Previous owner was kind enough to come over and help diagnose the problem. The pin in the super VUK switch fell out and the switch ws freely moving with the plastic ball cap. So it wouldn't activate....

Put the pin back in and tightened it nicely. Leveled & angled the machine for good measure and voila....it's all fixed.

Thanks for the pics

2 weeks later
#23 3 years ago
Quoted from TheHueManatee:

grb1959 - do you have a pic of the final outcome? I'm having issues as well... but I have three compression rings.
But the rings seems loose and the ball pop cap seems to sway back and forth (not shooting the ball up straight)
Not sure if everything needs tightening or replaced. A pic may help with my dilemma
Thanks!!

Hi THM,

Sorry for the delayed reply as I just saw your post. I am glad that you were able to get your issue resolved with the assistance of the previous owner.

It is a good idea to have a roll pin punch set in your tool kit to remove/replace roll pins on these assemblies when necessary. The roll pin punch set below is reasonably priced and has a nice assortment of sizes.

https://www.lowes.com/pd/Stanley-FATMAX-Punch-Set/1000085213

Gord

1 year later
#24 2 years ago
Quoted from GRB1959:

Hi THM,
Sorry for the delayed reply as I just saw your post. I am glad that you were able to get your issue resolved with the assistance of the previous owner.
It is a good idea to have a roll pin punch set in your tool kit to remove/replace roll pins on these assemblies when necessary. The roll pin punch set below is reasonably priced and has a nice assortment of sizes.
https://www.lowes.com/pd/Stanley-FATMAX-Punch-Set/1000085213
Gord

I think the bigger problem- in my game anyways- is that the super VUK does not like it when multiple balls get back there. Takes some nudging and time usually, to align it so the multiple balls relatably come out. Not sure anyone has come up with a solution as to that? My VUK is 100% on one ball ejects, but add a second the success rate drops to 50% and three even less.

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