I have a RYOBI pole saw that starts fine, but there is a disconnect between engine and saw blade. The blade will not turn.

https://diy.stackexchange.com/questions/187271/ryobi-circular-saw-motor-runs-blade-doesn-t

This may help you.

Refer to instructions that came with saw.
https://images.homedepot-static.com/catalog/pdfimages/0a/0a7ce2db-eccd-465d-b9b1-2a86ef83d748.pdf
https://www.manualslib.com/manual/682051/Ryobi-Ry43161.html?page=12

Check for clogs. Be very careful working around sharp tools.

Remember the time when Pole Saw did not exist? People used to use a ladder to reach the distant twigs and branches of trees. But, so pruning used to be a very tedious job which is now an exciting task to accomplish. Now, you do not have to think of pruning such branches with much difficulty because you can get a pole saw. It reliably offers a smooth cutting experience and makes pruning easy and convenient.
If you have a pole saw, you need to understand that possession begets responsibility. So, you should take excellent care of your pole saw. Moreover, its longevity and efficiency would reduce to some extent when you stop caring about the pole saw. Cleaning pole saw blade is a crucial part of maintenance.
So, here goes your guide to clean a pole saw blade.

• The first and foremost task is to clean all the impurities, dirt and tree debris. You can do it with the help of wire brush. To remove the oil residue, brush it with a rag or toothbrush and degreaser.
• Many people prefer citrus cleaner over oil. A citrus cleaner is a versatile cleaner that can be used for cleaning anything in your house.
• If you are using any degreaser product, mix it with water in a container and put the blades into the container.
• Let the blade soak into the water for few minutes, scrub it with a rag, rinse it properly and let it dry or wipe the water from the blades.
• Disassembling the pole saw is required before you clean a pole saw blade and put the blades in the container. For this purpose, remove blades from the pruner. You can take expert's help for this or unscrew the blade.
• Put the blade on a table where you would clean the blade and keep the edges facing up.
• Take a sharpening rod and push it forward only between the two teeth. This will file away the meat and sharpen the blade. Keep doing this for few times until you see the filings being developed on the back side of the blade. Make sure to file all the teeth on the blade.
• The back side of the blade should be rubbed with a file as well. It is required to remove the burrs from the blade.
• After sharpening coat, the pole saw blade by spraying oil on it to prevent rust and corrosion.

More details Guide On How To Clean Pole Saw Blade

• The first and foremost task is to clean all the impurities, dirt and tree debris. You can do it with the help of wire brush. To remove the oil residue, brush it with a rag or toothbrush and degreaser.
• Many people prefer citrus cleaner over oil. A citrus cleaner is a versatile cleaner that can be used for cleaning anything in your house.
• If you are using any degreaser product, mix it with water in a container and put the blades into the container.
• Let the blade soak into the water for few minutes, scrub it with a rag, rinse it properly and let it dry or wipe the water from the blades.
• Disassembling the pole saw is required before you clean a pole saw blade and put the blades in the container. For this purpose, remove blades from the pruner. You can take expert's help for this or unscrew the blade.
• Put the blade on a table where you would clean the blade and keep the edges facing up.
• Take a sharpening rod and push it forward only between the two teeth. This will file away the meat and sharpen the blade. Keep doing this for few times until you see the filings being developed on the back side of the blade. Make sure to file all the teeth on the blade.
• The back side of the blade should be rubbed with a file as well. It is required to remove the burrs from the blade.
• After sharpening coat, the pole saw blade by spraying oil on it to prevent rust and corrosion.

Do not forget to sharpen the blades with files that fit appropriately in the teeth. Diamond and whetstone files are being widely used for filing. So, this is how you can clean a pole saw blade and maintain it also. It does not take much effort. Invest your time to avoid replacing your favorite pole saw in the future.

Ryobi P4360/P4361 Cordless 18v ONE+ System Pole Saw ...

? 13:42
www.youtube.com/watch?v=PFANQ0JgpZk
Jun 12, 2013 - Uploaded by 8digitPDX The Ryobi 18v Power pruning saw - surprisingly good performance for the money from a ... Ryobi P4360/P4361 Cordless 18v ONE+ System Pole Saw Tree Pruning Saw .... Lithium-ionPole Saw - Unboxing and Review!

All details about the pole saw go to the link Pole Saw

It should still easily fit a 5/8" blade. The arbor shape shouldnt have any effect on the type of arbor hole needed on the saw blade (only round arbor holes are made on saw blades. You will probably find the arbor securing nut has a shape that fits into the flat gaps between the saw blade and the arbor when fixed. So grab a 5/8" round arbor saw blade and give it a go. It should work fine.
It is the arbor nut that secures the blade onto the arbor via friction which holds it on.

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There may be a push button type blade lock, and on many of these saws the retaining bolt for the blade is backwards threads, e.i., looking at the top of blade retaining bolt, turn it clockwise to loosen. This would normally tighten, but in the case of many of these saws, it loosens it.

unplug saw
new Ryobi have a spindle lock button, it is unobtrusive and you may miss it
If yours does not, secondhand etc, a screwdriver in the blade teeth between the upper and lower guards provides a locking bar enough to undo the arbor bolt