70398 XCMG GR2605 motor grader o-ring

70398 XCMG GR2605 motor grader o-ring

The 70398 O-ring is a general-purpose sealing accessory for construction machinery, mainly used in static sealing areas. It relies on its own elasticity to achieve a seal, preventing hydraulic oil and lubricating oil leakage, while also blocking dust and mud from entering the cavity. With its simple structure and reliable sealing, it is a commonly used basic sealing component in the hydraulic and transmission systems of equipment.

Technical Parameters

Model: 70398
Structure: O-ring
Material: Nitrile rubber (NBR)
Applicable Media: Hydraulic oil, gear oil, lubricating oil, grease
Operating Temperature: -30℃～120℃
Applicable Pressure: Suitable for medium and low pressure sealing conditions
Applicable Scenarios: Static sealing, end face sealing, pipe joint sealing

Suitable Scenarios

Suitable for hydraulic valve blocks, pipe joints, end caps, housing interfaces, and screw plug holes in construction machinery such as loaders, graders, and road rollers; used for static sealing of flat surfaces, flanges, and threaded interfaces, ensuring no system leakage and no impurities entering the cavity.

Common Faults and Troubleshooting

Interface Leakage: O-ring aging, cracking, or permanent compression deformation. Replace with a 70398 O-ring directly.

Seal Failure: Twisted during installation, incorrect edge cutting, or incorrect groove dimensions. Reassemble correctly and check groove cleanliness.

Premature Damage: Incompatible media or excessive pressure. Replace with an O-ring of the appropriate material and check system pressure.

Hardening and Loss of Inelasticity: Caused by prolonged high temperatures or aging. Replace with a new O-ring promptly to prevent further leakage.

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17 3454023 Set
18 72637 Lubricating Oil Cup
19 70262 Bolt M20×1.5×70
20 3461703 Locking Plate
21 3454043 Washer
22 3349823 Disc
23 3454033 Washer
24 3349913 Adjusting Shim 0.45
25 3463783 Adjusting Shim 0.18
26 3349903 Adjusting Shim 0.15
27 3516073 Seal
28 3454813 Support
29 70398 O-ring

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