Flowserve PT Series Limitorque - Manual (Page 14)

Limitorque PT Series Worm Gear Operator FCD LMENIM2001-00 – 01/10
14
4.2 Safety Practices
The following check points should be performed to maintain safe operation of the PT gear operator:
• Set up a periodic operating schedule on infrequently used valves.
• Ensure that the limit and/or torque switches on any electric actuator fitted to the PT worm gear operator are
correctly and appropriately adjusted.
4.3 PT12, 14, 30, 40
Refer to Figures 4.1, 4.2 and Table 4.1.
1. Remove the Key (pc# 18) from the Worm Shaft (pc# 2) assembly.
2. Remove the plastic Indicator Cap (pc# 19) by applying equal pressure underneath the cap, on opposite sides of the
cap, and prying upward.
note: The metal Indicator Cap is removed by removing the two screws that attach the Indicator Cap to the Quadrant.
3. Remove the Flange Cover Hex Head Screws (pc# 9)
4. Turn the operator onto its side and tap on the Quadrant (pc# 12) and flange of the Cover (pc# 1) to separate the
Cover, Worm Shaft (pc# 2) assembly, and Quadrant from the Gearcase (pc# 21).
Caution: Use a soft-headed mallet to prevent damage to the Quadrant bore and keyways.
Caution: Care should be taken to prevent the Quadrant and Worm Shaft assembly from completely disengaging from
the Gearcase.
note: The Flange Cover will not separate from the Gearcase without adequate force to overcome and clear the dowel
pin connections between the Flange Cover and Gearcase.
5. Return the operator to the upright position.
6. With the Quadrant free from the base of the Gearcase, lift the Cover, Quadrant, and Worm Shaft assembly from the
Gearcase and slide the Worm Shaft assembly away from the Quadrant.
7. Remove the Quadrant from the Gearcase.
8. Slide the Worm Shaft assembly out of the Flange Cover.
note: If additional disassembly is required, please follow the steps below:
9. Remove the Snap Ring (pc# 17) and tap out the Input Bearing (pc# 16) from the Cover.
note: The Smalley Retaining Ring (pc# 3) and Protection Sleeve (pc# 15) can be removed if required. Remove the
Protection Sleeve by tapping it out of the Flange Cover.
10. Remove Thrust Washers (pc# 7), Thrust Bearings (pc# 6), Worm Shaft Bearings (pc# 5), and Oil Seal (pc# 4) as
required.