Spur Gear Attachments - Flowserve Limitorque HBC Series User Instructions

4.5 Spur Gear Attachments

All of the standard Limitorque spur gear attachments are made up of gear sets. The first gear set is the 2.86:1
attachment. When the second gear set is added to the first, the overall attachment ratio increases to between 8.5
and 12:1. When both the first and second attachment are added to the third, the overall gear ratio is between 19
and 38.9. The disassembly instructions described below will disassemble the 38.9:1 attachment. Steps 1 through 5
describe the 2.86:1 disassembly, steps 1 through 10 describe the 8.5 to 12:1 attachment disassembly, and the full
instruction describes the 19 to 38.9:1 attachment disassembly.
Refer to Figure 4.3.
1. Remove the First Set Housing (piece #2).
2. Remove Input Shaft and Pinion (piece #3).
3. Remove Idler Gear (piece #4) and Idler Gear Spacer (piece #8).
4. Remove First Set Output Gear (piece #5).
5. If only 2.86:1 spur attachment is used you must next remove the Housing Adapter (piece #1) and Output Gear
Spacer (piece #7).
6. Remove Second Set Housing Adapter (piece #20).
7. Remove Intermediate Shaft and Pinion (piece #22) carefully. Thrust Bearings (pieces #27 and 28) are not captive
on the shaft.
8. Remove Output Gear Collar (piece #25).
9. Remove Second Set Output Gear (piece #23) and Second Set Output Gear Spacer (piece #24).
10. If the spur attachment gear ratio is 8.5 to 12:1, remove Second Set Housing (piece #19).
11. If the spur attachment ratio is 19 to 38.9:1, remove Third Set Housing Adapter (piece #32).
12. Remove Intermediate Shaft and Output Pinion (piece #33) carefully. Thrust Bearings (pieces #37 and 38) are not
captive on the shaft.
13. Remove Third Set Output Gear Collar (piece #35).
14. Remove Third Set Output Gear (piece #34) and Spacer (piece #36).
15. Remove Third Set Housing (piece #31).
NOTE: In reassembling the spur gear attachments, follow all of the instructions in the reverse order, ensuring that all
of the bearings indicated in the assembly drawings are intact and in good condition.
NOTE: When replacing gaskets, use gasket thickness of
Limitorque HBC Series FCD LMENIM3501-01 – 03/14
⁄ in.
1
32
15
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