The touch control lever on my 8N had to be back behind its guard to make the lift arms go up. Thus, I removed the hydraulic control unit to adjust it. The “position control pin” and the “control arm” were both bent. I replaced the position control pin, and straightened the control arm. I also checked the length of the “constant draft control spring”, and adjusted the “position control spring” to the specified 1 29/32 inches.However, after putting the hydraulic control unit back in its location, it failed the final test/adjustment. I have copied the steps from my August 18, 1948 operator’s manual below. Regardless of the position of my quadrant support plate, I cannot get the valve completely open as directed in step 7a. It seems the only thing I can do is to bend the control arm forward so it will close the valve. Am I missing something? Is the something else I should change to get the valve to completely open? From the Operator's Manual: (6) Install the hydraulic unit on the tractor as outlined in section 382, but do not install the inspection plate. (7) Place the position control lever in the forward position. Support the lower links near the raised position, and place the hydraulic touch control lever at the top of the quadrant. Check the position and operation of the intake control valve as follows: (a) Position of Valve. The valve should be completely open when the hydraulic touch control lever is at the top of the quadrant. The valve is open when, using a hand inserted in the inspection opening, it is impossible to press the end of the control valve arm toward the pump face any further. (b) Operation of Valve. Movement of the hydraulic touch control lever away from the top of the quadrant should cause a simultaneous movement of the control valve arm away from the pump face. Movement of the control valve arm should begin at the start of movement of the hydraulic touch control lever. There is only one position in which the quadrant support plate can be located where both of the above conditions will be met. To find this position, slightly loosen the four cap screws that support the quadrant. Hold the hydraulic touch control lever at the top of the quadrant and gently tap the quadrant support plate forward or backward until both of the above requirements are fulfilled.
|
