Flowserve PT Series Limitorque User Manual

Page 18

Limitorque PT Series Worm Gear Operator FCD LMENIM2001-00 – 01/10

4.4 PT50, 75

Refer to Figure 4.3, 4.4, 4.5 and Table 4.2

1. Remove the Key (pc# 6) from the Motorized Pinion (pc# 8).

2. Remove the plastic Indicator Cap (pc# 12) 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

(pc# 9).

3. Remove the Cover Screws (pc# 13)

4. Turn the operator onto its side and tap on the Quadrant (pc# 9) to separate the Flanged Cover (pc# 14) from the

Gearcase (pc# 2).

Caution: Use a soft-headed mallet to prevent damage to the Quadrant bore and keyways.

note: The Flanged Cover will not separate from the Gearcase without adequate force to overcome the Dowels (pc# 18)

connecting the Flanged Cover and Gearcase.

5. Return the operator to the upright position

6. Remove the Flanged Cover (pc# 14) with Motorized Pinion (pc# 6) and Bearings.

7. With the Quadrant free from the base of the Gearcase, lift the Quadrant and Worm Shaft assembly from the

Gearcase and slide the Worm Shaft assembly away from the Quadrant and out of the Gearcase.

8. Remove the Quadrant from the Gearcase.

note: If additional disassembly is required, please follow the steps below:

9. Slide the Motorized Pinion and Pinion Shaft Bearings (pc# 7) assembly out of the Flanged Cover by lifting the rear

bearing until it clears the bearing recess and tapping on the outboard end of the pinion shaft. .

10. Remove the Circlip (pc# 22) and tap out the Bearing from the inboard side of the Flanged Cover.

note: The Smalley Retaining Ring (pc# 23) and Protection Sleeve (pc# 24) can be removed from the Flanged Cover if

required. Remove the Protection Sleeve by tapping it out of the Flanged Cover.

11. Remove the Circlip (pc# 20) from the Worm Shaft

12. Remove the Spur Wheel

note: The Worm Shaft Bearings (pc# 17) are press-fitted to the Worm Shaft. Removal will require a gear puller or

similar device.

Reassembly Instructions:

1. If the Worm Shaft (pc# 16) components have been removed, reassemble the Worm Shaft with the Worm Shaft

Bearings (pc# 17), Spur Wheel (pc# 19), and Circlip (pc# 20).

2. Lower the Quadrant (pc# 9), with the wording up, and the Worm Shaft assembly, into the Gearcase simultaneously.

Caution: The O-Ring (pc# 1) on the lower Quadrant journal seals the Gearcase / Quadrant interface. Check the condi-

tion of the O-Ring. If damaged, replace it.

3. Mesh the gearing on the Quadrant with the Worm on the Worm Shaft and slide into the Gearcase.