Electric Power Tool Parts 101
This article defines the basic parts of most power tools, explains how they work, and what to look for when they stop working.
Diagnosing Electric Power Tools 101
This article is a troubleshooting guide for problems and malfunctions common to most electric power tools.
Discussion
Discussion for the Skil SHD77 (F012SD7705) 7 1/4" Worm Drive Skilsaw
fixin some shd77 for stone countertop company. lot of water use. thier rusty. thinking thier shorting out between field and armarture rubbing. can i sand out rust and paint to seal it??
Most of the parts for the Skil Model 77 types 14-16 are no longer available. As I remember the big difference between 14-16 types & type 17 were the motor parts and the gears and most likely the main housing ( basically the whole saw). It was nice when Skil had factory owned service centers, you could take a 77 in for repair and for $89.00 they would make it a new saw.
Has anyone tried substituting type 17 worm gears in a type 16 skilsaw? I have a model 77 '50th anniversary issue' worm drive and the gears are shot. Apparently the type 16 gears are no longer available, but since these saws didn't change much over time, I'm hoping the newer ones fit. Anyone?
Hi Kent,
In answer to your question. The type 16 and type 17 gears are both different sizes and the housings are not the same. You might try some local repair centers to see if they have any of the older gears.
WJA
The previous owner wasn't mechanically / electrically inclined. Said it didn't work.
It runs but generates a lot of sparks in the motor housing. The brushes seem to be fine...I'm not sure how I should verify that they need to be replace.
Any suggestions about the problem? Brushes? Other?
I am looking for some parts on a skilsaw. I can't seem to find the right model number on the parts page. The model number is a 77 not the HD77. serial #1B504000. This is an older saw. What I am wondering is if the the parts are the same? What model number is the closest?
Thanks Paul
I had a saw just like yours, but parts were getting harder to obtain, alot of the parts are no longer available. But I do have the parts list. Ill attach it here.
Good luck!!
My SHD77 Skilsaw turn on, but blade stops turning the moment I try and cut with it. In other words, while I would not recommend it, you can turn on the saw and almost stop the blade with your two fingers! Is this a "gear" problem, or more likely "armature"?
That's pretty strange! If the saw is [I]that[/I] weak then I really doubt you have motor problems. The blade might be slipping between the clamps. Those HD77 saws us a diamond knockout instead of a round arbor on their blades. If you are clamping the blade between the clamps but not using the diamond shaped knockout on the blade, you could get some pretty nasty slipping.
Reply: SHD77 Wormdrive
cmoorejack
Hey guys,
one more thing it might be is the nut that tightens the worm gear on the armature shaft...if you unscrew the black plastic nut on the end of the tool you can gain easy access to the nut..push in the lock pin to secure the assembly and tighten the nut..and that should put you back in business..[it is rare for the nut to loosen but it does happen once in a while..]
Hope this helps:)
cmoorejack
I have a Skilsaw Model 77, type 16 (in fact it's the '50th anniversary issue'. I need to replace the worm gears. Are they available? Can I use the ones listed for the model 17?
The gears for the type 16 and type 17 are different and not interchangeable. Unfortunately the manufacture has discontinued the parts for the type 16. So either find a type 16 with good gears or time to purchase a new one.