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(a) viscosity. Good viscosity is essential to ensure cushioning and quiet operation. An oil viscosity that is too high will result in excess friction and degradation of oil properties associated with high oil operating temperature.In cold climates gear lubricants should flow easily at low temperature. Gear oils should have a minimum pour point of 5C (9F) lower than the lowest expected temperature. The pour point for mineral gear oil is typically -7C (20 F). When lower pour points are required, synthetic gear oils with pour points of -40 C (-40 F) may be necessary. Nanoxia project s midi the following equation from the ASM handbook provides a method for verifying the required viscosity for a specific gear based on the operating velocity:

(e) gear speed.


The now-superseded industrial gear lubrication standards, AGMA 250.04, used center distance as the primary criterion for gear lubricant selection. The new version of this standard, designated AGMA 9005-D94 industrial gear lubrication, has adopted pitch line velocity as the primary selection criterion. As noted above, gear speed is a factor in the selection of proper oil viscosity. The pitch line velocity determines the contact time between gear teeth. High velocities are generally associated with light loads and very short contact times. For these applications, low-viscosity oils are usually adequate. In contrast, low speeds are associated with high loads and long contact times. These conditions require higher-viscosity oils. Anxiety attack causes and treatment EP additives may be required if the loads are very high.

(f) temperature. Ambient and operating temperatures also determine the selection of gear lubricants. Normal gear oil operating temperature ranges from 50 to 55 C (90 to 100 F) above. Oils operating at high temperature require good viscosity and high resistance to oxidation and foaming. Caution should be exercised whenever abnormally high temperatures are experienced. High operating temperatures are indicative of oils that are too viscous for the application, excess oil in the housing, or an overloaded condition. All of these conditions should be investigated to determine the cause and correct the condition. Oil for gears operating at low temperatures must be able to flow easily and provide adequate viscosity. Therefore these gear oils must possess high viscosity indices and low pour points.

Viscosity. Anoxia e hipoxia technically, the viscosity of an oil is a measure of the oil’s resistance to shear. Viscosity is more commonly known as resistance to flow. If a lubricating oil is considered as a series of fluid layers superimposed on each other, the viscosity of the oil is a measure of the resistance to flow between the individual layers. A high viscosity implies a high resistance to flow while a low viscosity indicates a low resistance to flow. Viscosity varies inversely with temperature. Viscosity is also affected by pressure; higher pressure causes the viscosity to increase, and subsequently the load-carrying capacity of the oil also increases. This property enables use of thin oils to lubricate heavy machinery. The load-carrying capacity also increases as operating speed of the lubricated machinery is increased. Two methods for measuring viscosity are commonly employed: shear and time.

Expressed in centipoise (cp) and is referred to as the absolute or dynamic viscosity. In the oil industry, it is more common to use kinematic viscosity, which is the absolute viscosity divided by the density of the oil being tested. Kinematic viscosity is expressed in centistokes (cst). Viscosity in centistokes is conventionally given at two standard temperatures: 40 EC and 100 EC (104 EF and 212 EF ).

(2) time. Another method used to determine oil viscosity measures the time required for an oil sample to flow through a standard orifice at a standard temperature. Viscosity is then expressed in SUS (saybolt universal seconds). SUS viscosities are also conventionally given at two standard temperatures: 37 EC and 98 EC (100 EF and 210 EF). As previously noted, the units of viscosity can be expressed as centipoise (cp), centistokes (cst), or saybolt universal seconds (SUS), depending on the actual test method used to measure the viscosity.

This is a book that has been long in coming! I first started out creating this book in 1992. Anoxic seizure it was after reading an MVPA’s army motors article by bryce sunderlin concerning the availability of the wartime army motors magazine. When I obtained copies, it was only available in microfilm form. I wanted a copy that I could hold in my hands. Well with 1200 pages or more to choose from it would have been an exceedingly difficult task–so I concentrated on the world war two jeep and articles that might be used to support it. My first attempt was very bad. The technology of the day was analog and either black or white, with no tonal qualities. Flash forward about ten years and then the technology was digital. So I had the microfilm converted to digital form on cds. Next, I edited each page, sometimes spending up to three hours cleaning up the stray marks on the page. I ended up with a project that was approximately 440 megabytes. I couldn’t find a publisher that would take on the project. Even the print on demand outfit I normally use couldn’t handle the size. Finally, I found a publishing outfit that could handle the size. I hope you enjoy it. The book can be found at amazon.Com and lulu.Com. Nanoxia deep silence 4 matx military maintenance for MB/GPW jeeps 1941-45 .