• Sundstrand Sauer Danfoss Series 20 Displacement Control Valve
    Sundstrand Sauer Danfoss Series 20 Displacement Control Valve
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    Sundstrand Sauer Danfoss Series 20 Displacement Control Valve   The top picture shows a control valve that is in perfect condition. Do not mess with the linkage, it is adjusted just right. These are set at the factory. They come locked and sealed with a cap noting that is directly from the factory.   The…

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  • Difficult to Locate Hydraulic Parts
    Difficult to Locate Hydraulic Parts
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    At our Hydrostatic Pump Repair Site, we offer many types of Hydrostatic Transmission Repair and information relating to Hydrostatic Parts Today we will discuss   Hydrostatic Transmission Service, LLC is your Hydrostatic/ Hydraulic looking glass for all of the hard to find Hydrostatic pumps, motors, transmissions, drives, equipment, components, and more! Chasing Down Hydraulic/ Hydrostatic…

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  • Stresses on Hydraulic Shafts
    Stresses on Hydraulic Shafts
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    Stresses on Hydraulic Shafts   There are three types of stresses on shafts: 1. Torsional Stress – twisting or rotation 2. Bending Stress 3. Axial Stress – parallel to the center line of the shaft Different stresses affect the shaft and how much force is put upon them. Most times, the design of a shaft…

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  • Sundstrand Sauer Danfoss Series 20 Piston Slippers
    Sundstrand Sauer Danfoss Series 20 Piston Slippers
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    Sundstrand Sauer Danfoss Series 20 Piston Slippers The two pistons standing up are in good shape. They will sit flush up against the thrust or swash plates. It needs to be able to turn freely and been at all the right angles. The piston cap next to the two pistons is scored pretty bad. If…

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  • Sundstrand Sauer Danfoss Series 20 – When to Replace Fixed Swashplate
    Sundstrand Sauer Danfoss Series 20 – When to Replace Fixed Swashplate
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    Sundstrand Sauer Danfoss Series 20 – When to Replace Fixed Swashplate The very top plate shows no marks, scratches or burrs on it. The side that is shown in the picture is the side that is crucial to having the slippers directly against it. The picture in the middle also shows that is it smooth…

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  • Sundstrand Sauer Danfoss M46 Shaft Seal Removal
    Sundstrand Sauer Danfoss M46 Shaft Seal Removal
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    At our Hydrostatic Pump Repair Site, we offer many types of Hydrostatic Transmission Repair and information relating to Hydrostatic Parts Today we will discuss Sundstrand Sauer Danfoss Series 40 M46 Shaft Seal Removal Lip type seals are used on the Series 40-M46 pumps & motors. The replacement of these seal do not require major dis-assembly…

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  • Viscosity of Grease for Bearings
    Viscosity of Grease for Bearings
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    Viscosity of Grease for Bearings   On the chart you will find the viscosities of different oils used for bearings. They are using the Saybolt Universal Seconds for determining this. It also shows shaft operating conditions. It will tell you which oils to use for what applications and for the temperature needed to do the…

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  • Specialty Bearings – Self Lubricating Bushing
    Specialty Bearings – Self Lubricating Bushing
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    Specialty Bearings – Self Lubricating Bushing This is a metal bearing sleeve with drilled out holes that are filled with pre molded dry lubricated plugs that supply lubrication. This bushing is more for high temperatures and really heavy loads. When you have a location your using your machine in, these bearings¬† are used when it…

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  • Vickers Vane Pump Part 2
    Vickers Vane Pump Part 2
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    Vickers Vane Pump Part 2   Direct Acting Relief Valves and Remote Control Unloading Valve The pumps are similar to the ones in Part 1, except they deliver from Pressure #2 outlet that could be dropped and the larger pump unloads to the tank as long as the pressure is put into motion at the…

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  • Sundstrand Sauer Danfoss Series 20 Circuits & Characteristics
    Sundstrand Sauer Danfoss Series 20 Circuits & Characteristics
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    Sundstrand Sauer Danfoss Series 20 Circuits & Characteristics Of a Pump/Motor In our discussion today we will talk about Circuits and their differences In hydrostatic transmissions there are 4 components involved: Fixed Displacement Motor Fixed Displacement Pump Variable Displacement Motor Variable Displacement Motor And these can be combined into 4 circuits Variable Displacement Pump driving…

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