Haudraulick problems on John Deere 3350

https://www.pembinatrails.ca › ...PDF
Web results
OPERATOR'S MANUAL

Check the hydraulic oil is as proper level and the pump bypass is closed.

indicates inconsistent pressure
low fluid level in reservoir, blocked filters or faulty valve system can cause the problem

Don't worry I'm sure you will get the solution of your problem, just check the link I attach.
John Deere 3050 3350 3650 Workshop Service Repair Manual

I worked for Kubota for 10 years and I am not familiar with a PTO temp sensor, John Deere or otherwise. The PTO function has nothing to do with engine other than slight increase in coolant temp when the PTO is under a load. Check for correct Hydraulic oil level(dipstick or sight glass in transaxel) and make sure grass or trash is not packed around the hydraulic oil cooler in front of the radiator. Remove the screen and use compressed air to clean it often. Change hydraulic oil filters every 100 hours

Your problem sounds suspiciously like a hydraulic relief valve sticking, and you can't build up required hydraulic pressure.

Low oil in the trans. Check the oil level my 2140 does the same when low.

ck your hydraulic oil tank level ? if ok ck that your three point hitch moves up/down ? this model uses the tractors hydraulics to steer , testing these things first helps to identify a bad steering valve

ineed to find a hydraulic reverser for a 300D john deere backhoe

Does the pump make any noises, if you touch the cylinders are they hot ?