Flowserve MT Bevel Gearboxes IOM - Manual (Page 12)

Limitorque MT Series FCD LMENIM4201-00 – 06/10
12
6. Using the specified lubricant, grease the thrust base assembly through the grease fitting. See
Section 5 Lubrication, and Figure 6.1, 6.2, 6.3, and 6.4 for grease fitting location.
7. Mount the operator on the valve as detailed in Section 4.3.1, Installing an Operator with a Threaded
Stem Nut.
4.3.3 Installing an Operator with a Blank Stem Nut (MT-4)
(Piece numbers refer to Figure 6.4 and Table 6.4).
1. Remove the key from the bottom of the operator. The key is located between the Thrust Drive
Sleeve (piece #117) and the Stem Nut (piece #392). The key is tapped (1/4-20) to provide for
removal.
2. Remove the Stem Nut by rotating in the proper direction. The Stem Nut is threaded into the Thrust
Drive Sleeve (piece #394). A slot is provided on the end of the Stem Nut to aid in its removal.
3. Thread the Stem Nut to suit the valve stem.
a CAUTION: Do not clamp the splined area of the Stem Nut during the tapping operation.
4. Reassemble the operator, reversing steps 1 and 2. Stem Nuts should be positioned flush with the
Thrust Drive Sleeve but can be recessed inward approximately 1/4 inch, if so desired. Stem Nuts
can also be positioned to extend below the Thrust Drive Sleeve approximately 1/4 inch without
jeopardizing the thrust rating of the operator. All Stem Nuts are threaded on the outside diameter
using eight threads per inch.
5. Mount the operator on the valve as detailed in Section 4.3.1, Installing an Operator with a Threaded
Stem Nut.