Hitachi ZX350H-3 Boom Hydraulic Cylinder Service Kit 4649049 (4628637 4628636)

What is 4649049?

4649049 is a boom cylinder seal kit for the Hitachi ZX350H-3 excavator, listed with OEM reference number 4649049. Cross-reference numbers listed with it: 4628637 and 4628636.

Match these before you buy:

1. Your machine is a Hitachi ZX350H-3.
2. The part number of your cylinder lines up with 4649049.
3. The serial number agrees, if the part number is unclear.

Part number 4649049, for the Hitachi ZX350H-3, used in the boom cylinder. Also listed under 4628637 and 4628636. Materials: PU, Viton and NBR rubber.

Signs of worn seals

• Oil weeping or dripping at the rod
• A cylinder that slowly creeps down under load
• Digging that feels weak or slow

The boom cylinder raises and lowers the boom, so its seals work against the weight of the whole front end.