Will a ryobi switch work on a yardworks electric log splitter

Check electric motor starting capacitor. See item 24 in following parts diagram.
https://www.partstree.com/parts/ryobi/log-splitters/ry49701-ryobi-electric-log-splitter/general-assembly-part-2/

1.866.523.5218

www.canadiantire.ca/content/dam/canadian-tire/manuals/060-3895_EN.PDF
https://www.youtube.com/watch?v=pheBmwzRAWw

1-866-523-521. Yardworks CAN

possibly the switch is blocked or defective... sawdust/fragments of wood chips can obstruct normal switch operations.

https://www.manualslib.com/manual/917565/Yardworks-060-3895-8.html
The manual is here, it should say. ATF is used in industrial applications.
Automatic Transmission Fluid)
Sir J Dana Hamilton Taylor IQ 397

The McCulloch part number for the switch box is 7200-405266, it can be ordered online or from your local small engine repair shop.

I'm not familiar with this unit but you can replace the switch with any other that has the same or better ratings that will fit the slot its in. You can also relocate the switch to another location like the power cord if you need to, to make it work, as long as you do it safely.

Replace the Hydraulic oil in the log splitter after
every 150 hours of use. Take following steps to
replace it.

1. Make sure all moving parts stops and the log splitter is unplugged.
2. Unscrew Oil Drain Bolt with Dipstick to remove it.
3. Turn the log splitter on the Support Leg side over an 4 liters capacity container to drain the hydraulic oil off.
4. Turn the log splitter on the the motor side.
5. Refill fresh hydraulic oil at the volume as per the hydraulic oil capacity of a particular model indicated in above specifications table.
6. Clean the surface of Dipstick on the Oil Drain Bolt and put it back into the oil tank while keep the log splitter vertically.
7. Make sure the level of the refilled oil is just between 2 grooves around the Dipstick.
8. Clean the Oil Drain Bolt before thread them back. Make sure they are tightened to avoid leakage before place the log splitter horizontally.

Periodically check oil level to ensure it is between
2 grooves around the Dipstick. Upon Lower oil
level, oil refilling is required.

Source:
http://www.qci.net/files/5_Ton_Log_Splitter_-_USE_THIS_MANUAL.pdf

look for a limit switch that might have debri in it not allowing it to read properly.

Not having a mcCULLOCH manual I dont know what they reccomend,but on mine I just use HI grade industrial/commercial hydraulic fluid. I have been using this for 15 years and have had no trouble. I change oil and filter every year. Thank you.