Hydraulic leaks can severely reduce breakout force, slow cycle times, and cause costly oil loss in heavy earthmoving operations. Whether you are maintaining classic E-Series machines (E200B, E240, E300) or high-production 300-Series equipment like the CAT 330D-L and 330D-N, replacing worn seals with high-performance aftermarket seal kits restores full system pressure and keeps your equipment working efficiently.
This guide details part numbers for Boom, Stick (Arm), Bucket, Long Reach, and Tilt cylinder seal kits tailored for Caterpillar hydraulic excavators.
Caterpillar Excavator Seal Kit Cross-Reference Guide
2. Caterpillar 330 Series Excavators (330D-L, 330D-N, 330L)
Boom Cylinder Seal Kits
Product Name
Model Compatibility
Part Numbers (P/N)
Boom Cylinder Seal Kit
330D-L
1140760 / 2426840
Boom Cylinder Seal Kit
330D-L
1140760 / 2502475
Boom Cylinder Seal Kit
330D-L
1140760 / 2590743
Boom Cylinder Seal Kit
330D-L
1140762 / 2304001
Boom Cylinder Seal Kit
330D-N
1140760 / 2426840
Boom Cylinder Seal Kit
330D-N
1140762 / 2304001
Stick (Arm) Cylinder Seal Kits
Product Name
Model Compatibility
Part Numbers (P/N)
Stick Cylinder Seal Kit
330D-L
2316844
Stick Cylinder Seal Kit
330D-L
2316845
Stick Cylinder Seal Kit
330D-L
2590768
Stick Cylinder Seal Kit
330D-N
2316844
Stick Cylinder Seal Kit
330L
1163649
Bucket & Tilt Cylinder Seal Kits
Product Name
Model Compatibility
Part Numbers (P/N)
Bucket Cylinder Seal Kit
330D-L
1140760 / 1915619
Bucket Cylinder Seal Kit
330D-L
1140760 / 2502475
Bucket Cylinder Seal Kit
330D-L
1140762 / 1948235
Bucket Cylinder Seal Kit
330D-L
1140762 / 2254625
Bucket Cylinder Seal Kit
330D-L
1140762 / 2590751
Bucket Cylinder Seal Kit
330D-N
1140760 / 1915619
Bucket Cylinder Seal Kit
330D-N
1140762 / 2254625
Tilt Cylinder Seal Kit
330L
1163612
Key Benefits of Heavy-Duty Aftermarket Seal Kits
High Thermal & Oil Resistance: Formulated using premium polyurethane (PU), nitrile rubber (NBR), fluororubber (FKM), and PTFE to withstand high hydraulic fluid temperatures and continuous friction.
Extended Service Life: Includes engineered rod wipers, buffer rings, and wear rings designed to stop debris ingress and protect cylinder walls from score marks.
OEM-Fit Precision: Manufactured to match Caterpillar original dimension tolerances, guaranteeing smooth pressure retention and zero fluid bypass.
Verification Steps Before Replacing CAT Cylinder Seals
Verify Equipment Serial Prefix: Caterpillar machinery uses distinct serial prefix codes (e.g., MBD, THJ, MWG). Always match the serial number prefix to confirm cylinder group configurations.
Identify Hydraulic Cylinder Group Numbers: Caterpillar stamps a cylinder group number on the barrel or head gland assembly. Cross-reference this number with the seal kit listing before servicing.
Inspect Rod & Bore Dimensions: If the hydraulic cylinder has been replaced previously with a third-party unit, measure the outer rod diameter and internal cylinder bore before ordering replacement seals.
