Cat 311C-330C Excavator Bucket Cylinder Seal Kit 1709941 – 65mm Rod x 100mm Bore

Fits Models At A Glance:

• Caterpillar Excavators – 300 Series: 311C, 312C, 312C L, 314C, 320C, 320D, 322C, 323D L, 324D, 324D L, 325C, 325C L, 325D, 325D L, 329D L, 330C, 330C L

Key Notes:

• Returns: This item is non-returnable once ordered — confirm fitment before purchase.
• Part Number(s): 1709941 (170-9941)
• Weight: 0.50 lbs (0.23 kg)
• Dimensions: 65 mm rod x 100 mm bore
• Application: Seal kit for the 65 mm x 100 mm bucket cylinder — cylinder groups 170-9808, 248-7855, 283-6118, 295-9396 and 309-5975
• Serial Number Notes: Cataloged on 312C KJA00001-UP and PCA00001-UP, 322C L HEK00001-UP, 324D L DFP00001-UP and JJG00001-UP, 325C L CRB00001-UP, 325D L A3R00001-UP and GPB00001-UP, 330C JCD00001-UP among others. The larger machines in this list (320D, 325D, 330C) also use other bucket cylinders with their own kits (2344587, 1948235, 2366389) — confirm your cylinder is the 65 mm rod / 100 mm bore unit before ordering.
• Manufacturer: Also supplied as Hercules CTC-1709941
• Condition: Aftermarket replacement part

Common Use Case or Symptoms:

Use when the bucket curls slowly, bleeds down while parked, or shows oil on the bucket cylinder rod on a Cat 312C, 320D or 325D L with the 65 mm cylinder.

Why Choose Broken Tractor:

• ✅ Cylinder group numbers listed — Five Cat cylinder groups share this kit — match the stamp on the barrel.
• ✅ Seventeen excavators, one kit — From the 311C to the 330C L.
• ✅ Fast Shipping from a U.S.-Based Team — ready to ship from our U.S. warehouses.