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Message: <blockquote data-quote="Mike10" data-source="post: 58097" data-attributes="member: 5461"><div style="text-align: left">I know picture is not the best, but I have to figure out how to send documents like this with the compression that is required to post it.  I think you can make out the test port from the photo in the document. </div><div style="text-align: left">The following is what the page says.  If you have no charge pressure do not run as specified below to warm the oil.  If you have no charge pressure you will probably need to pull the hydrostat pumps to see if something happened to the charge pump.</div><div style="text-align: left"></div><div style="text-align: left">Charge pump Pressure</div><div style="text-align: left">test</div><div style="text-align: left">Testing the lowpressure</div><div style="text-align: left">charge system is safer and usually more informative than going into the highpressure</div><div style="text-align: left">test</div><div style="text-align: left">ports. To obtain as much system information as possible, charge pressure readings must be taken in neutral as well</div><div style="text-align: left">as working the system in both the forward and reverse directions.</div><div style="text-align: left">With the system in neutral, only charge pressure is present in the closed loop. At this time, the leakage from the</div><div style="text-align: left">system is the least and the charge pressure is the highest. As the system is pressurized, the leakage from the system</div><div style="text-align: left">will increase and the charge pump flow will make up for this leakage. With more of the charge pump oil flowing to</div><div style="text-align: left">the closed loop, less oil will flow across the charge pressure relief valve, and therefore the pressure will be slightly</div><div style="text-align: left">less. If the leakage from the system is excessive, the charge pressure will drop off more. This slight drop in charge</div><div style="text-align: left">pressure between the system in neutral and with the system under load indicates the condition of the closed loop</div><div style="text-align: left">system components.</div><div style="text-align: left">IMPORTANT:</div><div style="text-align: left">For the following test the machine MUST be raised up on supports until the tires are above the floor.</div><div style="text-align: left">This is a safety procedure if the parking brake fails to hold.</div><div style="text-align: left">IMPORTANT:</div><div style="text-align: left">You will need two people to perform this test. The operators seat must be raised to gain access to the</div><div style="text-align: left">hydrostatic pumps. In order to start the engine, someone will need to fasten the seat belt and press on the seat to</div><div style="text-align: left">close the seat switch.</div><div style="text-align: left">1. Raise and securely block the unit off the ground.</div><div style="text-align: left">Connect a 4,137 kPa (41 bar) (600 psi) pressure</div><div style="text-align: left">gauge to test port 1, see next figure.</div><div style="text-align: left">2. If the hydraulic oil is not at operating temperature run</div><div style="text-align: left">the engine at full throttle and hold the bucket control</div><div style="text-align: left">lever in the ROLLBACK position for 30 seconds.</div><div style="text-align: left">Then return the bucket control lever to NEUTRAL for</div><div style="text-align: left">15 seconds. Repeat this cycle until the temperature</div><div style="text-align: left">of the oil is at least 52°C (125°F).</div><div style="text-align: left">3. Continue to run the engine at full throttle. Read</div><div style="text-align: left">the pressure gauge and record the Charge Pressure</div><div style="text-align: left">reading. Stop the engine.</div><div style="text-align: left">4. The pressure must be a minimum of 2,482 kPa (24.8</div>bar) (360 psi) at full throttle.</blockquote>

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