990173 Ring Backup Fits Caterpillar Models
990173 Ring Backup Fits Caterpillar Models
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One New Aftermarket Replacement Backup Ring for Caterpillar (Cat) Excavators and Cold Planer
This backup ring (part number 990173 / 0990173) is a hydraulic sealing component used in the hydraulic track adjuster assembly on Caterpillar (Cat) mini and mid-size excavators and the PM-465 Cold Planer. Backup rings prevent seal extrusion in high-pressure hydraulic applications, protecting O-rings and elastomeric seals from being forced into clearance gaps under pressure surges, extending the life of the overall sealing system in hydraulic cylinders, pumps, and valves.
Compatible Models
Caterpillar Mini Hydraulic Excavators: 307, 307B, 307C, 307D, 307E, 308C, 308D, 308E, 308E CR, 308E SR, 308E2 CR
Caterpillar Hydraulic Excavators: 311, 311B, 311C, 311D LRR, 311F LRR, 312, 312B, 312B L, 312C L, 312D, 312D L, 312D2, 312D2 GC, 312D2 L, 312E, 312E L, 313B, 313D, 313D2, 314C, 314D CR, 314D LCR, 314E CR, 314E LCR, E110B, E120B
Caterpillar Cold Planer: PM-465
Replaces Part Number(s):
990173, 0990173
New aftermarket replacement part - not remanufactured, not used.
