Thank you for helping me with my dad's tool. I messed it up by cutting concrete with it. My grease was like paste. Now it sounds great. My dad's been gone for 11 years and it comforts me to know that his saw will live on a little while longer.
Grateful for the video, I’ve taken my old SR700 Mitre saw apart and was worried that my on-hand replacement grease might not be suitable, glad to hear it doesn’t matter too much!
The process the grease has gone through is called "polymerization" for those of us who are super-nerdy and not tool snobs. Great vintage saw, BTW! 👍🏻👍🏼
Thanks a lot for creating this video, you just saved me huge headaches doing the same for my 7391. I had gotten to the snap ring and was worried I would break it. You just made the entire operation easy though. So many of these old BnD 7391's still going, mine hasn't missed a beat since I bought it. Thanks again for the great video.
Thanks for this well-done video. I probably would have wasted a lot of time with unnecessary disassembly without your guide. Wish I had watched before I took off the cap on the brush end of the motor (yes, the rubber plugs fell out without my noticing.) The only thing I would add is when re-packing the gearbox with grease, don't over pack it. I put in way too much grease and it bogged down the gears badly. I had to go back in and remove about 3/4 of the grease I had used. I had snap ring pliers which helped getting the snap ring off, but putting it back on was just as you described. My saw should now be good for another 35 years.
Peter, thanks for the useful comments! I wasn't sure about how much grease to use, and I did leave some air in the gearbox on mine, which seemed to be good enough, as it didn't bog down. Good to know you can use too much grease. It would have been nice if they used the type of snap ring with the two holes in the ends, but they didn't, so I didn't even try my snap ring pliers. That snap ring is definitely the hard part.
GREAT video and thanks for sharing! I also have this same brand and model of saw but use it only sparingly. It must be around 40 years old and still runs well, though when the motor is stopping, it makes a funny sound when the blade comes to a stop. I am guessing that the mechanism also needs lubricating inside like with your saw.
I have a Skilsaw 5150 I bought at a thrift shop so I'm definitely appreciating your video. The parts do not seem to be exactly the same but they're pretty close. I'm not sure if I'm going to go as far as you did with the grease. It probably needs it but it runs OK. When I first got it, the bearing in the blade area was making a bad noise but a little oil cleared that up. Anyway, a small tip. The bearing on the motor end of mine had a piece of foam that was covering the bearing. Which I think that was factory and was probably originally intended to be saturated with oil so it would wick fresh oil into the bearing as needed. Anyway, the foam on mine was falling apart and all nasty and going everywhere so I got rid of it, cleaned all the rotted foam out and got a piece of felt that was about the same thickness. Put it in there and saturated it with oil.
I think the oil in the blade area gears will eventually need to be replaced with grease as oil evaporates (slowly) and also it may be thrown out when the blade spins. I like the oil saturated felt fix on the motor bearing. Sounds like a good solution.
My dad owned a Black & Decker circular saw that I think he bought during the 80s. However, at some point, the blade became dull and he couldn't get the bolt loosened to replace the blade. I'm not sure it ever occurred to him to use a thin metal rod to keep the blade from spinning ( 1:30 ). I took it out, used a tent stake to keep the blade from spinning, and just used a wrench and a rubber mallet to loosen the bolt. Probably the first time the blade was able to be removed in 30-35 years.
I just rescued a Skil saw that was underwater (i.e. the Atlantic Ocean) for several hours during Hurricane Ian. Believe it or not, the darned thing still works! However, it sounds a wee bit rough. I'm thinking that an overhaul like this would be beneficial. Thanks for the guidance!
Thank you so much for this video. I inherited this saw from my grandfather and I’m trying to give it some much needed TLC. Do you have any recommendations for oil & grease to use? I’ve never done anything like this before and don’t want to buy the wrong stuff.
Sorry for the slow response. Busy busy. The grease to use in the gears is any lithium based general purpose grease as this is a metal to metal lubrication task that is not high pressure or high temperature and is not a wet environment. For the motor bearing oil, I just used standard engine oil - 30W or 10W-40W. It's not critical since this isn't a high pressure or high temperature situation.
I agree a new cord would be a good idea. I dug into it and found that B&D hardwires it into the switch and motor and they seem to have bonded the strain relief to the cord. So swapping it out is a bit more involved that I wanted to do at this time. So I put new tape over the failing area to keep it from bending there and getting worse, for the time being. This saw has another wear issue - the split pin keeping the base plate from wobbling is wearing and allowing the base plate for rock sideways some. A new split pin should help. Another video possibility.
Ok, I was out at 2:20 when he mentioned springs. Because when I do it, the spring goes out flying across the room, never to be found again.😄 Gotta pay the service guy . . .
Hi there.. I have just bought a used black and decker 7931. I have been searching and search for a users manual. No luck. Can you possibly send me in the right direction? Or do a video for me… I am a complete novice and need details… I appreciate your time and videos. Thank you.
I suggest doing a Google, Images search on, "Black & Decker 7391 exploded view". This will lead to several places to try to find the manual. Or at least you can see the parts in it.
@@whatwouldjohndo8977 thank you soooo much. I actually found a manual for Craftsman and it is exactly the same!! I 100% enjoy your videos!!! Every single one!! I am a novice and your videos help me very much!! I am buying used right now to save money and eventually get something better. I am currently looking for a used mitre saw… so excited to get one.. .. been using a manual one I got from estate sale. Ha. Working on some small projects currently. Thank you very much for your reply and I have become 1 of your biggest fans!! 😬
Thank you for sharing the video Have you changed the power cord I see tape on it it's easy I did it on one of my skill saws just a safety idea for you if you repacked it with grease and checked the carbon brushes I've had a degrees without taking my apart I stuck into the spindle pushing it down using the screw a couple times I got in there and helped my skill saw from 2009 runs ok makes the normal sound because it has no brake so slow down sound is like a metal chattering sound perfectly normal my other skill does that from new
Thanks for your comments and suggestions. The tape around the power cord is just preemptive. The cord inside is fine. The tape just makes it bend around a larger radius so the insulation doesn't break as soon. Further down the cord I did accidentally cut it during a project and I fix these things using professional electrical techniques with shrink wrap around each wire first, then tape. Recently I've been using "liquid electrical tape" either by itself or over regular electrical tape to seal it all up and prevent unwrapping. It dries quickly and looks great.
Well, it seems so.e versions have a permanently fixed main gear plate. The place and gear come out as one piece.., Makes cleaning and greasing a little more difficult. But not impossible.
i hv just got my first circular saw, it's stanley stel 311, i bought it secondhanded, do you think it has the same way and same components? i will do the maintenance for it looks so awful and the former owner really did hard work with it.
Oscar, Sorry for the slow reply. I can't say whether your Stanley has the same access as the Black & Decker, but going in from the same direction (behind the blade) is worth a try. It may avoid a bunch of extra dismantling that isn't necessary. If you do get in, don't pack the gearbox completely full of grease. Some air in there is necessary. Good luck.
@@whatwouldjohndo8977 i hv got Dewalt dw352, it is quite the same with BD 7391..this video is very helpful, the Stanley Stel311 had a problem with the gear, tried to replace the bearing but apparently it gets stuck with the gear cover made from hard plastic material, not metal, and they sell the unit, i mean, we cant just replace the bearing and the gear per one, it is sold as one unit part, the gear+bearing+the cover. So i moved to dewalt dw352, i bought it secondhanded, it works fine. Edit : The difficult part for me is dealing with the snap ring. 😌
Suit yourself, but some of us prefer to keep things running for a long time. A certain satisfaction is derived from it. Plus, it reduces waste, resource use, saves money, etc.
I like me some harbor freight stuff, but this is the exact consumerist mindset that led to a demise in quality, serviceable tools, and well, everything else too. You could finish this job quicker than you could drive to harbor freight, assuming you have grease or don't live 200 feet from the store.
@@JulianA-tr6pt - "Consumerism": the continual buying and consuming of material possessions. The "Good/Fast/Cheap" management principle applies when one can only have two of the three elements. A "Consumerist" prefers 'fast & cheap' over quality.
Thank you for helping me with my dad's tool. I messed it up by cutting concrete with it. My grease was like paste. Now it sounds great. My dad's been gone for 11 years and it comforts me to know that his saw will live on a little while longer.
good video. Connection with your Dad even better!
Grateful for the video, I’ve taken my old SR700 Mitre saw apart and was worried that my on-hand replacement grease might not be suitable, glad to hear it doesn’t matter too much!
The process the grease has gone through is called "polymerization" for those of us who are super-nerdy and not tool snobs. Great vintage saw, BTW! 👍🏻👍🏼
Good job.
My old Black and Decker 7308 (Mustard yellow with an orange power cord) still runs like a champ.
Great video. Simple and detailed. Now my saw should be good for another 20 years.
Thanks a lot.😊
Thanks a lot for creating this video, you just saved me huge headaches doing the same for my 7391. I had gotten to the snap ring and was worried I would break it. You just made the entire operation easy though. So many of these old BnD 7391's still going, mine hasn't missed a beat since I bought it. Thanks again for the great video.
I'm glad it was helpful! Thanks for the feedback.
Thank you. Mine’s around 30 years old. I will follow your advice and give mine some needed maintenance. Cheers.
Thanks for this well-done video. I probably would have wasted a lot of time with unnecessary disassembly without your guide. Wish I had watched before I took off the cap on the brush end of the motor (yes, the rubber plugs fell out without my noticing.) The only thing I would add is when re-packing the gearbox with grease, don't over pack it. I put in way too much grease and it bogged down the gears badly. I had to go back in and remove about 3/4 of the grease I had used. I had snap ring pliers which helped getting the snap ring off, but putting it back on was just as you described. My saw should now be good for another 35 years.
Peter, thanks for the useful comments! I wasn't sure about how much grease to use, and I did leave some air in the gearbox on mine, which seemed to be good enough, as it didn't bog down. Good to know you can use too much grease. It would have been nice if they used the type of snap ring with the two holes in the ends, but they didn't, so I didn't even try my snap ring pliers. That snap ring is definitely the hard part.
GREAT video and thanks for sharing! I also have this same brand and model of saw but use it only sparingly. It must be around 40 years old and still runs well, though when the motor is stopping, it makes a funny sound when the blade comes to a stop. I am guessing that the mechanism also needs lubricating inside like with your saw.
Outstanding, informative video! Love my old saw.
Great video! Thank you so much! 👍
Thank you!! Just followed along with my 7391.
Glad it helped!
I have a Skilsaw 5150 I bought at a thrift shop so I'm definitely appreciating your video. The parts do not seem to be exactly the same but they're pretty close. I'm not sure if I'm going to go as far as you did with the grease. It probably needs it but it runs OK. When I first got it, the bearing in the blade area was making a bad noise but a little oil cleared that up.
Anyway, a small tip. The bearing on the motor end of mine had a piece of foam that was covering the bearing. Which I think that was factory and was probably originally intended to be saturated with oil so it would wick fresh oil into the bearing as needed.
Anyway, the foam on mine was falling apart and all nasty and going everywhere so I got rid of it, cleaned all the rotted foam out and got a piece of felt that was about the same thickness. Put it in there and saturated it with oil.
I think the oil in the blade area gears will eventually need to be replaced with grease as oil evaporates (slowly) and also it may be thrown out when the blade spins. I like the oil saturated felt fix on the motor bearing. Sounds like a good solution.
Hi! I have this saw as well. Are you able to adjust the depth of the blade? Thank you
My dad owned a Black & Decker circular saw that I think he bought during the 80s. However, at some point, the blade became dull and he couldn't get the bolt loosened to replace the blade. I'm not sure it ever occurred to him to use a thin metal rod to keep the blade from spinning ( 1:30 ). I took it out, used a tent stake to keep the blade from spinning, and just used a wrench and a rubber mallet to loosen the bolt. Probably the first time the blade was able to be removed in 30-35 years.
BEAUTIFUL
I just rescued a Skil saw that was underwater (i.e. the Atlantic Ocean) for several hours during Hurricane Ian. Believe it or not, the darned thing still works! However, it sounds a wee bit rough. I'm thinking that an overhaul like this would be beneficial. Thanks for the guidance!
Thanks for sharing your video I own a few circular saws two skill saw Bosch made and my grandfathers black and decker u 130 from the 1960's
Thank you so much for this video. I inherited this saw from my grandfather and I’m trying to give it some much needed TLC. Do you have any recommendations for oil & grease to use? I’ve never done anything like this before and don’t want to buy the wrong stuff.
Sorry for the slow response. Busy busy. The grease to use in the gears is any lithium based general purpose grease as this is a metal to metal lubrication task that is not high pressure or high temperature and is not a wet environment. For the motor bearing oil, I just used standard engine oil - 30W or 10W-40W. It's not critical since this isn't a high pressure or high temperature situation.
dont you think a new cord wouldnt be a bad idea ? there are running a lot of amps
I agree a new cord would be a good idea. I dug into it and found that B&D hardwires it into the switch and motor and they seem to have bonded the strain relief to the cord. So swapping it out is a bit more involved that I wanted to do at this time. So I put new tape over the failing area to keep it from bending there and getting worse, for the time being. This saw has another wear issue - the split pin keeping the base plate from wobbling is wearing and allowing the base plate for rock sideways some. A new split pin should help. Another video possibility.
Ok, I was out at 2:20 when he mentioned springs. Because when I do it, the spring goes out flying across the room, never to be found again.😄 Gotta pay the service guy . . .
Still using that saw in 2022. It was my dads
Same here 2024 but was my grandpa's
Great good job clear instructions ok GodBlessyou
I have the same saw. I need to lube my saw too!
The power cord could use some TLC 🔌⚡
Hi there.. I have just bought a used black and decker 7931. I have been searching and search for a users manual. No luck. Can you possibly send me in the right direction? Or do a video for me… I am a complete novice and need details… I appreciate your time and videos. Thank you.
I suggest doing a Google, Images search on, "Black & Decker 7391 exploded view". This will lead to several places to try to find the manual. Or at least you can see the parts in it.
@@whatwouldjohndo8977 thank you soooo much. I actually found a manual for Craftsman and it is exactly the same!! I 100% enjoy your videos!!! Every single one!! I am a novice and your videos help me very much!! I am buying used right now to save money and eventually get something better. I am currently looking for a used mitre saw… so excited to get one.. .. been using a manual one I got from estate sale. Ha. Working on some small projects currently. Thank you very much for your reply and I have become 1 of your biggest fans!! 😬
Thank you for sharing the video Have you changed the power cord I see tape on it it's easy I did it on one of my skill saws just a safety idea for you if you repacked it with grease and checked the carbon brushes I've had a degrees without taking my apart I stuck into the spindle pushing it down using the screw a couple times I got in there and helped my skill saw from 2009 runs ok makes the normal sound because it has no brake so slow down sound is like a metal chattering sound perfectly normal my other skill does that from new
Thanks for your comments and suggestions. The tape around the power cord is just preemptive. The cord inside is fine. The tape just makes it bend around a larger radius so the insulation doesn't break as soon. Further down the cord I did accidentally cut it during a project and I fix these things using professional electrical techniques with shrink wrap around each wire first, then tape. Recently I've been using "liquid electrical tape" either by itself or over regular electrical tape to seal it all up and prevent unwrapping. It dries quickly and looks great.
Well, it seems so.e versions have a permanently fixed main gear plate. The place and gear come out as one piece..,
Makes cleaning and greasing a little more difficult. But not impossible.
i hv just got my first circular saw, it's stanley stel 311, i bought it secondhanded, do you think it has the same way and same components? i will do the maintenance for it looks so awful and the former owner really did hard work with it.
Oscar, Sorry for the slow reply. I can't say whether your Stanley has the same access as the Black & Decker, but going in from the same direction (behind the blade) is worth a try. It may avoid a bunch of extra dismantling that isn't necessary. If you do get in, don't pack the gearbox completely full of grease. Some air in there is necessary. Good luck.
@@whatwouldjohndo8977 i hv got Dewalt dw352, it is quite the same with BD 7391..this video is very helpful, the Stanley Stel311 had a problem with the gear, tried to replace the bearing but apparently it gets stuck with the gear cover made from hard plastic material, not metal, and they sell the unit, i mean, we cant just replace the bearing and the gear per one, it is sold as one unit part, the gear+bearing+the cover. So i moved to dewalt dw352, i bought it secondhanded, it works fine.
Edit : The difficult part for me is dealing with the snap ring. 😌
Helo.. I was looking a drive gear for my saw Sawcat 8" ser no: 1258
As a repairman WD-40 dries out the bearings
Kunci bintang no berapa aja
If I had to do all that I'd go to harbor freight.trash it
Suit yourself, but some of us prefer to keep things running for a long time. A certain satisfaction is derived from it. Plus, it reduces waste, resource use, saves money, etc.
I like me some harbor freight stuff, but this is the exact consumerist mindset that led to a demise in quality, serviceable tools, and well, everything else too. You could finish this job quicker than you could drive to harbor freight, assuming you have grease or don't live 200 feet from the store.
@@JulianA-tr6pt - "Consumerism": the continual buying and consuming of material possessions.
The "Good/Fast/Cheap" management principle applies when one can only have two of the three elements.
A "Consumerist" prefers 'fast & cheap' over quality.