I just dug out my service manual 2013 and read about the relief valve setting. This book covers the model 40. To adjust the relief valve setting, first, adjust relief valve pressure for remote system to 1040 to 1080 psi. Then add .060 shim to provide relief valve pressure to excess of 1080 psi while touch-o-matic relief valve is being checked. THE .060 SHIM MUST BE REMOVED AFTER TESTS ARE COMPLETED. DO NOT MOVE REMOTE CONTROL VALVE LEVER WHILE THESE SHIMS ARE IN THE VALVE AS DAMAGE MAY RESULT. Raise the draft links until the lift arms are parallel to floor and block them up.Move control lever forward and remove the 1/2 inch pipe plug from valve housing. Install a 3/8 inch pipe plug into the tapped passage directly below the plug just removed. Then install a hydraulic pressure gauge which will measure at least 2000 psi into the opening from which the 1/2 plug was removed. With the control lever in forward position, start tractor and let it reach it's normal operating temperature. Move enging speed control lever to wide open and while observing pressure gauge, slowly pull the tom control lever to the rear. Relief valve operatijng pressure should be 1040 to 1080 psi. A audible "whir" will be noted when relief valve opens. If the relief valve operating pressure needs to be reset, drain oil and remove rock shaft housing. Reset the pressure by turning the adjusting screw in to increase and out to decrease the pressure setting. Use special wrench to set and lock relief valve adjusting s and lock screw. NOTE one complete turn of the adjusting nut against the relief valve spring increases the pressure 120 lbs. When removing the pressure gauge after pressure has been set be sure all pressure has been relieved by stopping engine and moving control lever forward as far as possible. Remove the 3/8 pipe plug and reinstall the 1/2 pipe plug and tighten securly.
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