1540738 Ring-Backup Fits Caterpillar Models
1540738 Ring-Backup Fits Caterpillar Models
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One New Aftermarket Replacement Backup Ring for Caterpillar (Cat) Excavators
This backup ring (part number 1540738) is a hydraulic sealing component used in high-pressure static and dynamic sealing applications on Caterpillar excavators. Backup rings are installed alongside O-rings in seal grooves to prevent extrusion and deformation under hydraulic pressure, maintaining fluid integrity in hydraulic cylinders, control valves, and pumps. Regular replacement helps extend O-ring life and reduces the risk of hydraulic system failure.
Compatible Models
Caterpillar Excavators: 320B, 320C, 320D, 320D FM, 320D GC, 320D L, 320D LN, 320D LRR, 320D RR, 322B, 322C, 323D L, 323D LN, 323D SA, 324D, 324D L, 325C, 325C L, 325D, 325D L, 328D LCR, 329D, 329D L
Replaces Part Number(s):
1540738
New aftermarket replacement part - not remanufactured, not used.
