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Bobcat Skidsteer Forums
General Bobcat Skidsteer Forum
cold 743 wanted to jump forward on start attempt
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<blockquote data-quote="Topper1" data-source="post: 133256" data-attributes="member: 22814"><p>Theres a lot going on internally with a hydrostst pump. But to put it simply,</p><p>When cold, oil does not flow as intended. </p><p>The actuator valve is spring centered but is also internally pressure regulated.</p><p>The initial startup oil pressure spike pushes the swash plate servo actuators, easily overcoming the spring centering (usually fwd). </p><p>After a few seconds of running, the internal pump charge pressures equalize to normal, and the symptom vanishes. </p><p> It was a common issue with a lot of the early rexroth & danfoss hydrostat pumps, especially those with hydraulic pilot hand controls. Some early linkage controlled machines also experienced this oddity.</p></blockquote><p></p>
[QUOTE="Topper1, post: 133256, member: 22814"] Theres a lot going on internally with a hydrostst pump. But to put it simply, When cold, oil does not flow as intended. The actuator valve is spring centered but is also internally pressure regulated. The initial startup oil pressure spike pushes the swash plate servo actuators, easily overcoming the spring centering (usually fwd). After a few seconds of running, the internal pump charge pressures equalize to normal, and the symptom vanishes. It was a common issue with a lot of the early rexroth & danfoss hydrostat pumps, especially those with hydraulic pilot hand controls. Some early linkage controlled machines also experienced this oddity. [/QUOTE]
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Bobcat Skidsteer Forums
General Bobcat Skidsteer Forum
cold 743 wanted to jump forward on start attempt
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