Solenoid valve cleaning

[burt_100]

I have a 7840 that the gear solenoid and lift solenoid valves r sticking intermitently and I want to clean them but unsure how to dismantle and what solvent to use?

 

[Treemover]

I’m far from an expert, but my go to product for solenoids is always wd40. I don’t know how to check them, I just replace ones that don’t work; but more times than not, it’s been loom issues.