GE Masoneilan 4700P Maintenance Manual

Also see for Masoneilan 4700E: Instruction manual

Contents

© 2015 General Electric Company. All rights reserved .50 | =GE Oil & Gas4. Select the desired cam lobe and replace cam (26) on cam shaft with low signal lineof desired lobe against cam follower. Ensure that the newly selected cam lobe is inthe same relative position as the lobe in Step 3.5. Replace washer (27) and screw (28). Reduce pressure applied in Step 2 to zero(back off the handwheel if handwheel was used). Disconnect the independentregulated air line to actuator and connect positioner output line. Connect supplypressure and signal to positioner. Check zero and span adjustment. Refer to “ZeroAdjustment” on page 48 and “Span Adjustment” on page 48.Air to Close / Direct Acting PositionerSee Figure 19 on page 68 and Figure 20 on page 71.1. 1. Shut off supply pressure and signal to positioner. Valve is now open and cam(26) is at low signal line on lobe.2. With cam at low signal line remove screw (28) and washer (27). Note the relativeposition of the cam lobe being changed and then remove the cam (26).3. Select the desired cam lobe and replace cam (26) on cam shaft with low signal lineof desired lobe against cam follower. Ensure the newly selected cam lobe is in thesame relative position as the lobe noted in Step 2.4. Replace washer (27) and screw (28). Check zero and span adjustment. Refer to“Zero Adjustment” on page 48 and “Span Adjustment” on page 48.Air to Close / Reverse Acting PositionerSee Figure 19 on page 68.1. Shut off supply pressure and signal to positioner. Valve is now open and cam (26) isat high signal line on lobe. Do not remove.2. Run an independent regulated air line to the valve actuator in place of positioneroutput line. Slowly apply proper air pressure through the regulator to shut thevalve. Do not exceed designated supply pressure. (Handwheel may be used toclose the valve in place of regulated air line.) Align the travel indicator with theclosed end of travel scale. Cam is now at low signal line on lobe.3. With cam at low signal line remove screw (28) and washer (27). Note the relativeposition of the cam lobe being changed and then remove the cam (26).4. Select the desired cam lobe and replace cam (26) on cam shaft with low signal lineof desired lobe against cam follower (4A). Ensure the newly selected cam lobe is inthe same relative position as the lobe noted in Step 3.5. Replace washer (27) and screw (28). Reduce pressure applied in Step 2 to zero(back off the handwheel if handwheel was used). Disconnect the independentregulated air line to actuator and connect positioner output line. Connect supplypressure and signal to positioner. Check zero and span adjustment. Refer to “ZeroAdjustment” on page 48 and “Span Adjustment” on page 48.