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<blockquote data-quote="TriHonu" data-source="post: 52611" data-attributes="member: 897"><p> <table style='width: 100%'><tr><td><span style="font-size: 10px">Quote:<br /> <strong>Bisonhuner</strong>- 'I may end up tiptoeing around the pressure limit to get the rpms needed to throw. '</span></td></tr></table><p>The speed of the motor is primarily a function of the hydraulic flow, not the pressure. Hydraulic motors have a displacement. The displacement is the volume of oil that must flow through the motor to make the shaft turn one revolution.</p><p>In simple terms (not accounting for the motors volumetric efficiency) lets look at a motor that for every gallon of oil that flows through the motor the shaft rotates 50 revolutions. If you flow a half gallon of oil through the motor it will rotate about 25 times.</p><p>If the motor that turns the fan is directly mounted to the fan, you will have to get a motor that has the correct displacement for the amount of flow in your auxiliary circuit. If the motor is chain drive from the motor to the fan, then you could change the size of the sprockets to adjust the speed of the fan.</p><p>If you can find out what the displacement of the existing motor and what hydraulic flow it was designed to operate at, we can help you size a new motor once you find the flow of your 753C. According to the <a href="http://www.bobcat.com/historical_specs/skid_steer/753_1994" target="_blank"><span style="font-family: 'Arial'"><span style="font-size: 10px"><span style="color: #0000ff"><em>Bobcat Historical Specs</em></span></span></span></a> your 753C was rated for 13 gallons per minute auxiliary flow and will probably show about 2400 psi at the couplers.</p></blockquote><p></p>
[QUOTE="TriHonu, post: 52611, member: 897"] [TABLE] [TR] [TD][SIZE=2]Quote: [B]Bisonhuner[/B]- 'I may end up tiptoeing around the pressure limit to get the rpms needed to throw. '[/SIZE][/TD] [/TR] [/TABLE] The speed of the motor is primarily a function of the hydraulic flow, not the pressure. Hydraulic motors have a displacement. The displacement is the volume of oil that must flow through the motor to make the shaft turn one revolution. In simple terms (not accounting for the motors volumetric efficiency) lets look at a motor that for every gallon of oil that flows through the motor the shaft rotates 50 revolutions. If you flow a half gallon of oil through the motor it will rotate about 25 times. If the motor that turns the fan is directly mounted to the fan, you will have to get a motor that has the correct displacement for the amount of flow in your auxiliary circuit. If the motor is chain drive from the motor to the fan, then you could change the size of the sprockets to adjust the speed of the fan. If you can find out what the displacement of the existing motor and what hydraulic flow it was designed to operate at, we can help you size a new motor once you find the flow of your 753C. According to the [URL='http://www.bobcat.com/historical_specs/skid_steer/753_1994'][FONT=Arial][SIZE=2][COLOR=#0000ff][I]Bobcat Historical Specs[/I][/COLOR][/SIZE][/FONT][/URL] your 753C was rated for 13 gallons per minute auxiliary flow and will probably show about 2400 psi at the couplers. [/QUOTE]
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