Precautions for oil seals
 1. Preparatory work and matters needing attention before starting
 a. Comprehensively inspect the mechanical seal, and whether the installation of auxiliary devices and pipelines is complete and whether it meets the technical requirements.
 b. Before starting the mechanical seal, conduct a static pressure test to check whether there is any leakage of the mechanical seal.  If there is a lot of leakage, find out the cause and try to eliminate it. If it is still invalid, it should be disassembled for inspection and reinstalled. Generally, the static pressure test pressure is 2~3 kg/cm2.
 c.Press the pump steering wheel to check whether it is brisk and even. If the cranking is difficult or does not move, you should check whether the assembly size is wrong and whether the installation is reasonable.
 2.Installation and shutdown
 a.Before starting, keep the sealed cavity filled with liquid.  When transporting solidified medium, steam should be used to heat the sealed cavity to melt the medium.  The car must be cranked before starting to prevent the soft ring from breaking due to sudden start.
 b.For mechanical seals that use the external oil sealing system of the pump, the oil sealing system should be started first.  Stop the oil sealing system last after parking.
 c. After the hot oil pump is out of service, the cooling water in the oil seal cavity and the end face seal cannot be stopped immediately. The cooling water should be stopped only when the oil temperature at the end face seal drops below 80 degrees to avoid damage to the sealing parts.
 3.Operation
 a.If there is a slight leakage after the pump is started, it should be observed for a period of time.  If the leakage does not decrease after 4 hours of continuous operation, the pump should be stopped for inspection.
 b.The operating pressure of the pump should be stable, and the pressure fluctuation should not exceed 1 kg/cm2.
 c.When the pump is in operation, avoid pumping out to avoid dry friction on the sealing surface and damage to the seal.
 d.The sealing condition should be checked frequently.  During operation, when the leakage exceeds the standard, the heavy oil is not more than 5 drops/min, and the light oil is not more than 10/min. If there is no improvement within 2-3 days, the pump should be stopped to check the sealing device.
 Instructions for the use of oil seals:
  When the lubricating oil volume of the reducer is ≤7 liters, the amount of lubricating oil added per liter is 20‐30ml;
  For 7-15 liters, add 15-20ml per liter of lubricating oil;
  When >15 liters, add 10ml per liter of lubricating oil;
 7. Oil seals that are not used temporarily should be kept properly to prevent them from being stained with oil, dust or sun exposure.
 8. When the shaft diameter wears into a "V"-shaped groove, so that the contact pressure between the new oil seal lip and the shaft drops and cannot function as an oil seal, the displacement method can be used to make up for it


SEVEN  Reasons to Replace Metal Case Rotary Seals with  HDAG oil seals:

1. Improved sealing in an imperfect housing
The composite rubber/aramid fiber heel provides a gasket-like seal for improved sealing against the bore.The surface conditions of bore housings are frequently riddled with imperfections due to damage during improper seal installation and removal, or simply due to cost sensitivity in their original manufacture. Metal can seals lack the ability to conform to such imperfections, frequently necessitating the use of supplemental gaskets or bore sealants during installation to prevent bore leakage.
2. No need for compression or bore plates
The outside diameter of the flexible, composite elastomer/aramid fiber heel is slightly oversized to create a tight interference press fit. The tight fit and compression-set-resistant heel construction eliminate the necessity of compression plates for bore retention
3. Corrosion-resistant
Clipper seals have a composite elastomer/aramid fiber heel and rubber elastomeric lip so there is no concern for rust or corrosion. The only metal component is a 302 stainless steel garter spring. The stainless spring handles higher operating temperatures and resists rust/corrosion better than carbon steel springs used in other rotary shaft seals.
4. Durable, one-piece molded construction
The Clipper Oil Seal features one-piece molded construction across its entire available size range (0.25" to 92"+ shaft diameters). This molding process is more robust as compared to metal case rotary seals constructed from multiple components that are glued and/or crimped together during assembly.
5. Resistant to issues arising from thermal expansion
Metal case seals are prone to sealing complications brought on by thermal expansion. As an example, consider what happens when interfacing a carbon steel metal case seal with aluminum housing in applications where large rapid temperature swings occur. Aluminum housings will expand at a different rate than the carbon steel case of the rotary lip seal; leaving you vulnerable to bore retention issues and/or failure due to leakage from the housing/seal OD interface. 
6. Easy, damage-free installation
7. Highly customizable
The rubber molding process allows for greater customization to fit specific design envelopes. The addition of flanges, buttons, mounting and bolt holes, etc. are all possible. 

REQUESTING THE RIGHT SEAL ,LET HDAG SHOW YOU AS FOLLOW:

LEARN HOW TO SELECT THE RIGHT ROTARY OIL  seal  AND OIL SHAFT SEALS