Control Valve

Fill oil reservoir. Connect suitable pressure gauge between pump and steering gear. Start engine. Center valve until unit is not self-steering. Tap on head of valve body attaching screws to move valve body up on steering housing, and tap on end plug to move valve body down on housing. Bleed all air from unit by turning wormshaft back and forth through the travel several times.
Refill reservoir. With steering gear on center, tighten gear shaft adjusting screw until backlash in steering gear arm just disappears. Make sure gear shaft preload (see above) has been properly adjusted. Starting from a point at least one full turn of the wormshaft either side of center, torque at sector shaft required to turn unit through center at 2 RPM in each direction shall not exceed 20 ft.lbs. or vary more than 5 ft.lbs. from left to right.
NOTE: Valve must be on outlet side of gauge.
Adjust torque to be equal in both directions by readjusting the valve. Tighten valve body adjusting screw to 200 INCH lbs. With gear at or near full turn in either direction, attempt to return unit to center by applying torque wrench at steering gear shaft. Hold wormshaft until cross shaft torque builds up to 50 ft.lbs. Release wormshaft and maintain a constant steady pull at 2 RPM on gear shaft. If cross shaft torque does not drop to 20 ft.lbs. maximum as unit passes through center, check for too much interior drag, binding valve lever, binding spool valve or tight cross shaft adjustment.
With unit under power, but with no load, torque required to rotate wormshaft through an included angle of 180° (90° either side of center) at 6 RPM (or one resolution every 10 seconds) shall be 6-10 INCH lbs. Disconnect test equipment.