Oil weeping at the rod, a cylinder that creeps down under load and digging that feels weak are the usual reasons a cylinder gets resealed. Kit 4653041 is the one listed for the arm cylinder on the Hitachi ZX520LCH-3.
The arm cylinder pulls the stick in and pushes it out. That crowd motion is what you dig with, and the seals feel every stroke.
The compounds are polyurethane (PU), Viton and NBR. PU copes with pressure spikes, Viton with heat, and NBR is the usual oil-resistant rubber.
Fitment check
- Machine model: ZX520LCH-3
- The part number of your cylinder against 4653041
- Machine serial number
- Part number 4653041
- For the Hitachi ZX520LCH-3
- Goes in the arm cylinder
- Cross-reference: 4637753
- Made with PU, Viton and NBR rubber
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