Flowserve PT Series Limitorque - Manual (Page 22)

Limitorque PT Series Worm Gear Operator FCD LMENIM2001-00 – 01/10
22
7. Remove the Segment Gear from the Worm Housing
8. Remove the Worm Shaft/Bearing assembly from the Worm Housing.
9. Remove Worm Shaft Bearings (pc# 3) from the Worm Shaft/Bearing assembly, if required, with a gear puller or
similar device.
Reassembly Instructions:
1. Check the condition of the Motor Flange Bushing (pc# 22), Segment Gear O-Ring (pc# 5), and Face Groove O-Ring
(pc# 4). Replace as required.
2. Grease the tapered roller bearings on the Worm Shaft/Bearing assembly (pc# 3) and place the Worm Shaft/Bearing
assembly into the Worm Housing (pc# 2) bore, stopping short of engaging the back Roller Bearing Cone.
3. Offset the Worm Shaft/Bearing assembly toward the outside of the Worm Housing so that it is away from the center
hub bore.
4. Grease the center hub bore and install the Segment Gear into the Worm Housing.
note: Push the Segment Gear straight into the Worm Housing to avoid cutting the Segment Gear O-Ring (pc# 5).
note: The Segment Gear should be seated on the shoulder in the base of the Worm Housing for PT60 operators with
one-piece segments. For operators with a removable bushing, be sure the Valve Position Indicator plate is
installed on the Segment Gear until the Worm Cover (pc# 10) is installed so that the valve position is maintained
upon reinstallation.
5. Engage the Worm Shaft/Bearing assembly with the Segment Gear and move it inward to engage the Roller Bearing
Cone.
6. Slide the other Roller Bearing Cone into the bearing bore and push it forward using the Bearing Spacer (pc# 9). The
Worm should now be engaged properly with the Segment Gear.
note: Ensure that the Worm Shaft/Bearing assembly rotates with minimal play. Remove shims until the Worm Shaft/
Bearing assembly is tight, then add back one shim to obtain the proper fit.
7. Install the Thrust Spacer Shims (pc# 18) on the Bearing Spacer (pc# 9), engage in the housing bore, and fasten
with the Thrust Spacer Bolts (pc# 20).
note: For operators with spur gear attachments, there will be a 1/8 inch gap from the outside of the Worm Housing
(pc# 2) to the Bearing Spacer when the Bearing Cone engages. For operators without spur gear attachments, the
Thrust Spacer length is built into the Bearing Spacer (pc# 9).
8. Re-lubricate the Worm Housing, focusing on the Worm/Segment Gear interface, while rotating the Worm Shaft/
Bearing assembly (pc# 3). Lubricate the top hub of the Segment Gear.
9. Run a bead of silicone around the top edge of the Worm Housing (pc# 2).
10. Place the Worm Cover on the hub and push down straight and even. Install the Worm Cover Bolts (pc# 6) and
tighten.
11. Mount the Valve Position Indicator (pc# 12) in the appropriate position relative to the Segment Gear.
12. Check rotation to ensure proper operation. The Worm Shaft/Bearing assembly should be capable of operation by
hand. Stroke through a complete open-close cycle.