If pushing trees over with a backhoe or excavator were to be the cause of dieseling, in general, I'd be putting seals in every machine here, every 6 months.
10 years since reseal, and leaking gland causing teardown, leads one to believe that some other force was/ is at work here.
Dipper cylinder on my 322bl would eat Bulldog piston seals within 2 months, regardless of how meticulous I was at removing air at installation.
Only reason for removal was electrocution of rod. After 3rd set of Bulldog seals, put Caterpillar seals in...never touched that cylinder again.