Foster Manufacturing Corporation
1836 Oakdale Ave , Racine, Wisconsin, United States

Electric Hydraulic Power Units

  Fosters line of Electric Hydraulic Power Units are designed and built to last. We use Baldor and other Quality Electric Motors along with American Made Gear Pumps and Pressure Compensated Pumps on Custom Designed Power Units.  Our Electric Power Units are listed as "Basic" Power Units. Controls, Heat Exchangers, Filtration and Custom Valveing can be added.

Gasoline Hydraulic Power Units

Our Gas Hydraulic Power Packs are powered by Hondas GC and GX line of dependable engines. Along with Kubotas line of higher horse power engines we offer a very wide spectrum of Pressure and Flow Rates.  Heavy-Duty Steel reservoirs and frames make for a very rugged package. Crane lifting and Roll Cage options are available on all our Gas Power Units. We offer "Basic" systems that can be customized to your requirements as well as "Complete" system tailor designed to fit most all common uses.

Diesel Hydraulic Power Units

Diesel 83 HP The most demanding jobs require Heavy-Duty Equipment, we overbuild the term Heavy-Duty!  Foster has you covered. Thermostat Controlled Heat Exchangers, Reservoir Heaters, Pressure Compensated Pumps and a vast array of Hydraulic Control Valves lets Foster Taylor our Diesel Hydraulic Power Units to your needs.  John Deere, Kubota and Kohler Diesel Engine, optional Marine Grade Powder Coating and Certified Welding make Foster Diesel Hydraulic Power Units a Standard in the Industry!   

  DESIRABLE PROPERTIES OF HYDRAULIC FLUID

• Proper Viscosity: Choose a viscosity high enough to provide good sealing and proper lubrication, but not too high to cause significant pressure drops, loss of efficiencies or high power consumptions.
• Good Lubricity: Choose oil that has good lubricity, which is the ability to carry heavy loads while maintain low frictional properties.
• High Viscosity Index: The measure of the degree of change in the viscosity of fluid as change in temperature occurs. High index is the less the oil will thin when the temperature increases and low index the less the oil will thicken when temperature decreases.
• Stable & Non-degrading: Fluid should be thermal and shear stable and should resist breakdown from oxidation and bacteria.
• Low Compressibility: Compressibility is important when oil is subjected to higher pressure. High compressibility results in lower efficiency and higher apparent viscosity characteristics.
• Low Foaming: Low foaming is critical to performance. Excessive foaming can cause cavitation of the pump and premature wear
• High Heat Transfer: An important aid to remove heat generated in normal pumping and use of hydraulic fluids.
• Good Demulsibility: Demulsibility is the ability to resist emulsification and allow for separation and removal of water.
• Non-corrosive & Rust Inhibiters: Oils that are compatible with hydraulic components. Should contain effective rust inhibitors.
• Low Vapor Pressure: Assists in preventing cavitation and high wear rates of the hydraulic pump.
• Cleanliness: Extremely important to use clean and non-contaminated hydraulic oil. With extremely tight tolerances built into pumps any contamination could destroy a pump. Even new oil should be filtered before using. A 10-Micron Medium is recommended.