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Re: CASE 446 SLOWS DOWN

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Author 
Max

09-14-2001 20:06:09




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Its hard to troubleshoot with such little information to go on so here goes the assuming. First check the oil level of which I assume you put in either 20w40 or 20w50 motor oil to the tune of 5 quarts on models after 1980, where the tank is below the battery. If oil level and type are ok, then check the hydraulic pressure, either inline at the pto or gulp, at the input side of the control valve. With your foot firmly placed on the brake pedal, trans in high range, front wheels against a loading dock or similar type of wall, move the travel lever full forward at low idle and full throttle. The pressure should be 1750PSI + at idle, and 2250-2350 at full throttle. I like mine at 2500psi for I use a tiller and the hydraulics run cooler along with the custom 2590 front grille. If the pressures are not in the given range for both engine speeds, check under the tank to ensure the suction hose to the pump isn't soft and collapsed, if so repalce hose, if ok then try adjusting the main releif until the pressure is attained. If the full throttle pressure is ok but the low idle pressure is low, then you may have a pump that needsd replacing. If you can't get either pressure up, then check the lift circuit releif pressure, it should be set at 750 psi and once again I prefer 1000 psi to lift my tiller, if this pressure is ok yet higher that the main pressure, there is a good possibility the main releif valve has a cracked ball seat or the spring is broken. If the spring is broken, order one at your local Ingersoll dealer and repalce and reset the pressures, if the ball seat is cracked, go to the same dealer while hanging onto you pants and get a new control valve. These valve used to be quite expensive when I worked at Case. You may want to just find a good dealer with hydraulic skills to make the required checks and repairs. Good luck

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