As temperature increases, fluid viscosity decreases and vice versa. In other words, the “thicker” oil had resulted in extra drag on the hydrostatic transmission powering the ground-drive, causing the machine to use more fuel. In any troubleshooting situation, no matter how simple or complex the hydraulic system, always start with the basics. It follows that if the pump can't get oil it can't produce flow. In any troubleshooting situation, no matter how simple or complex the hydraulic system, always start with the basics. Also, check the clamps and mounts when the system is under pressure. Also is the rear end fluid the same fluid that the hydraulic pump Engine cooling was improved by a thermostatically controlled hydraulic fan drive based on engine coolant temperature. This directly influences the hydraulic system’s operating oil temperature, which largely determines Oil Viscosity, completing the Power Efficiency Diamond. The maintenance staff recently reported that the pump (piston-type) had failed - for reasons unknown at this time. /°X20¶sEõaÄ) It was concluded that the modification tested could result in a small cost saving with respect to a reduction in size of the oil cooler. 8N - Hydraulic Lift - Troubleshooting, by Zane Sherman Troubleshooting the 8N Hydraulic Lift Before doing anything to the lift it should first be inspected for any internal leakage. Using Troubleshooting Chart If you are experiencing a problem that is not listed in this chart, see your John Deere dealer for service. I think this is the righ forum for this size tractor. If you don’t consider hydraulic fluid to be a critical component of any hydraulic system, you may suffer the same fate as these engineers. Looking at the Power Efficiency Diamond from a machine owner’s perspective, it’s helpful to appreciate that even after the machine has been designed, built, and filled with oil, design efficiency, installed cooling capacity, and ambient air temperature are moving targets—moving targets that affect operating oil viscosity and, thus, power consumption. Male tip failures could include internal poppet/ball stop being damaged or has moved out of position. FredM, Oct 20, 2018 Oct 21, 2018 #13 Etbrown44 New Member You can also test your injectors by removing them from the engine and hooking them back up to the steel fuel lines. The machine used a two-section, combination heat-exchanger for both hydraulic oil and engine coolant. Sign up for Hydraulics & Pneumatics eNewsletters. More general information is If you're skilled in reading and interpreting hydraulic symbols, the system's schematic diagram (if available) can be useful in identifying possible locations. So check that the reservoir is filled to the correct level, the breather is not clogged, the suction strainer or filter (if fitted) is not clogged, the pump intake isolation valve is fully open and the pump intake line is otherwise unrestricted. If load and surface speed remain constant, but elevated operating temperature causes viscosity to fall below that required to maintain a hydrodynamic film, boundary lubrication occurs; this creates creating the possibility of friction and adhesive wear. Course objectives include: Perform reservoir, heat exchanger, and pump maintenance Understand maintenance Changing any one affects the symmetry of the diamond. If your Mitsubishi tractor is vibrating excessively when the hydraulic system is activated, check all the clamps and mounts. Situation or Problem SCV coupler flow checking can be caused by either a failed male hydraulic tip or a defective female coupler. This is the viscosity range where the hydraulic system will operate most efficiently: the highest ratio of output power to input power. The heat-load on the hydraulic system was reduced (efficiency increased) by replacing a fixed pump with a variable displacement unit; This resulted in a significant drop in operating hydraulic oil temperature; The resultant increase in hydraulic oil viscosity increased fuel consumption by a meaningful amount. After using for awhile idle down and hyd. The hydraulic oil’s viscosity, viscosity index, or the optimum viscosity number for the hydraulic components in the system apparently were not considered during the test. It is fantastic. Here are some suggestions to get you started fixing your tractor. Q and A: Answers to the Most Frequently Asked Questions about Hydraulics Q: What is the difference between a one-stage pump and a If nothing conclusive was revealed, I would continue the process of elimination using a flow-tester to conduct a direct pump test. So let's apply these fundamentals to the above situation in a way that ensures the obvious things are not overlooked. Tractor sat for 5 years. The drawback with this arrangement is, due to engine cooling being thermostatically controlled and the hydraulic system not, air flow through the combined heat-exchanger depends entirely on engine temperature. While these tips are specifically for the Ford 8N, many other models of antique tractors will show similar symptoms when their hydraulics need attention. Can any tell me what might be the problem with my 2955 hydraulics? Assuming this trial was conducted at the same ambient temperature for both pump options, a 30° C (54° F) drop in hydraulic oil temperature is quite remarkable. light started to flicker, so i changed the filter and hyd oil. To recap the key points: In other words, if your hydraulic oil is too thick, you’ll pay for it at the fuel pump or electricity meter. Hydraulic pumps create flow - not pressure. By Vintage Tractor Engineer | January 14th, 2009 | Hydraulics, MF35 FE35 TO35, Troubleshooting | 11 Comments Share This Story, Choose Your … Brendan Casey has more than 26 years of experience in the maintenance, repair, and overhaul of mobile and industrial hydraulic equipment. "The new pump is delivering a maximum pressure of 1,000 PSI..." My son and I now believe that we can take our tractor Hydraulics Whether a stainless steel bracket mount or a plastic insert clamp, go around and tighten all the fasteners. take the rod side hoses off the cylinders. These fluids have a high viscosity index, so their viscosity is less sensitive to changes in temperature than a monograde oil.                                                                            Â. Fluid viscosity is one of the factors that determines whether full-film lubrication is achieved and maintained. No reverser, std pto with the side lever. This means the reduction in heat-load from replacing the fixed-displacement pump with a variable-displacement unit resulted in a significant reduction in hydraulic oil temperature—which is normally a good thing! Why Your Hydraulic Machine Probably Needs an Oil Cooler—and a Big One! thanks Had the more efficient pump with the existing cooling capacity been matched with a fluid of suitable viscosity, it’s likely the machine’s fuel economy would have been superior to the original system. Good troubleshooting section – think I’ve diagnosed my problem and can’t wait to get started on the strip-down of my TO35. If you notice that there are issues with the tractor hydraulics, there are several key areas you can troubleshoot to get the tractor running efficiently and effectively again. The ground drive on the machine already used a variable-displacement piston pump (hydrostatic transmission), so upgrading the attachment’s hydraulic circuit to a more-efficient configuration seemed logical progression by the machine’s design engineers. When you have checked all the possible causes listed and you are still experiencing the problem Keeping it there requires that change in the dependant variables be kept to a minimum. This means more heat is dissipated from the hydraulic oil and, therefore, hydraulic oil viscosity increases further. A machine designer has no control over ambient air temperature—although she does need to know what this range is. 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