Having an intermittent problem with ball return on my '67 Gottlieb Sing Along. Recently restored the game (posted some pics and already received some help from pinside - thanks).
Here is the deal....
Ball return is sluggish and maybe one out of three balls won't make it up the ramp. This despite:
Cleaning ramp when game was apart
New coil sleeve installed
Checked for any binding (none) in the kicker mechanism. Spring on kicker arm seems firm as I heard it should be.
Cleaned and checked gap on hole switch, relay and score motor
Did the 'old leaf switch under ramp' adjustment to make sure ball is seated properly in the hole (as seen on RGP)
I think the kicker is throwing the ball too high, as it does not have as much forward momentum as it looks like it should (watching it work when apron is off), and I noticed some wear marks on underside of apron which indicate rubbing from the ball.
With everything done and the apron off, the ball will consistently make it up over the ramp (but just barely, almost pathetic). With the apron back on, it fails the 1/3 of the time (approximately) I mentioned. I know you can bend play field kickers (usually L and R), not sure how to adjust for more of a forward vs. upward motion with this kicker.
Kind of at a loss. More of a nagging issue than anything else as the game works nearly perfectly except for this.
Any thoughts are appreciated. Thanks