490 JOHN DEERE AT196477 Boom Hydraulic Cylinder Service Kit Excavator Repair Seal Kits

When You Open And Repair The Cylinder, Please Follow Below Operation:

1. Take off the cylinder from the machine.

2. Remove the head assembly and the rod assembly from the stick cylinder group.

3. If it always happens that the seal kit not perform well soon after it fitted, there maybe problem of the cylinder assembly itself. It is better to check the cylinder assembly whether need to change it.

4. Measure the seal kits before fitting.

5. Install the seals: after fix the cylinder assy, test it first before re-install the stick cylinder group on the machine.

Parts On Group Boom Cylinder:

Measures For Oil Leakage Due To Inadequate Oil Seal:

1. Master and recognize the basic knowledge of fake and inferior products, and purchase high-quality and standard oil seals.

2. During installation, if the roughness of the outer surface of the shaft diameter is low or there are defects such as rust, burrs, etc., smooth it with a fine emery cloth or whetstone; apply clean engine oil or grease to the lip of the oil seal or the corresponding position of the shaft diameter. Apply sealant to the outer ring of the oil seal, wrap the key way on the shaft with hard paper to avoid scratching the lip of the oil seal, and use a special tool to rotate and press the oil seal inwards. Do not smash the hard seal to prevent deformation of the oil seal or squeeze the spring and fail; If there is lip cuffing, the spring falls off and the oil seal is skewed, It must be removed and reinstalled. It should be noted that when the shaft diameter is not worn and the spring force of the oil seal spring is sufficient, do not tighten the inner spring without authorization.

3. The oil seals applied to machinery generally have to be inspected, maintained and maintained when the general working conditions are poor, the ambient temperature difference is large, the dust is excessive, and the vibration of the machine tool frequently changes the stress condition of the machine parts.

4. If the shaft diameter and bearing are seriously worn; The rubber seal oil is aging or the spring is invalid, etc., repair and replace the corresponding parts in time.

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