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 4649051 is the one listed for the arm cylinder on the Hitachi ZX360LC-3.
Part number 4649051, for the Hitachi ZX360LC-3, used in the arm cylinder. Also listed under 4628635 and 4644677. Materials: PU, Viton and NBR rubber.
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.
Questions about 4649051
Which models is it listed for?
The Hitachi ZX360LC-3.
Which OEM number does 4649051 match?
The listing uses 4649051 as the OEM reference part number.
What are the other numbers listed with 4649051?
They are cross-reference numbers for this application: 4628635 and 4644677. They help when you compare against a parts book or the number on your old part.
Before buying, compare the model (ZX360LC-3), the part number of your cylinder and the serial number with what is listed here.
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