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Differential Lock.
how do you take the boom cylinder apart on a john deere 310c backhoe
Your hydraulic fluid level is low, your hyd. pump is weak, your hyd. filter needs replacing, there is a spring release that is activated by hydraulic pressure under the machine, above the transaxle, if it does not receive enough hydrulic pressure, it will not release completely..
I tried to paste but unable due to being in pdf files, just google timing specs for john deere 310 and it should guide you to the pdf
There are two fuel filters specified by FRAM for this vehicle. A square FRAM P1130A and a round PS7408A
Ouch! this could be a problem. I would start by looking for a Bentleys guide. You may need to contact Mercedes directly or a repair shop for a wiring diagram.