3500973 Hydraulic Cylinder Seal Kit for CAT 329DL Boom Cylinder 3494146

The boom cylinder on a CAT 329DL lifts the entire front end, so its seals run under high pressure and constant shock. When they wear, the boom starts to sag, lift feels slow, or the rod comes back with oil on it. This kit is the replacement for that repair. OEM references: 3500973 and 3494146.

Seals are PU and NBR. PU handles the pressure lips and sliding wear. NBR takes oil-side and static sealing. Profiles are cut to OEM dimensions, so they seat without trimming or stretching. Seal kit only — barrel, rod, and piston are not included.

Match the machine serial and cylinder part number before ordering. The 329DL can use more than one boom cylinder configuration, so the model alone may not be enough.