Goulds Pumps 3171 - IOM - Manual (Page 49)

A snap ring (369) is no longer required due to the fits. If your pump has a snap ring, then it is not
necessary to reinstall it. However, the snap ring is still required on sealed bearings.
2. Slide the casing assembly onto the shaft and seat the casing flange against the column flange.
Make sure the discharge nozzle is aligned with the discharge pipe hole in the support plate.
3. Install the bolts (371G).
Assemble the impeller, suction cover, and strainer
1. Add a film of oil to the shaft and place the impeller key (178) and impeller (101) on the shaft.
2. Check that all of the bearing shell bolts (370C and 370D) are completely backed off.
3. Install the impeller washer (199) and impeller screw (198).
When you tighten the impeller screw, the impeller will be seated on the shaft. The impeller screw has a
nylon insert to lock it in place. Do not exceed these torque values when you tighten the impeller screw:
Group Torque value
S/ST 500 in-lbs (56 Nm)
M/MT and L 900 in-lbs (102 Nm)
4. Install the suction cover gasket (351), suction cover (182), and strainer (187) with bolts (317N).
Alloy strainers have extra-heavy spacer washers (533) between the strainer and the suction cover. If
the unit is supplied with a lower-float control guide arm (366), then use an extra-long bolt in this hole.
5. Check the axial travel of the impeller.
If the travel is less than 0.030 in. (0.762 mm), then add extra gaskets (351) in order to obtain the
minimum travel.
6. Install the discharge elbow gasket (351A) and the discharge elbow (315) using bolts (370H).
Accurate alignment of the elbow is critical in order to make sure that there is no obstruction to the
flow through the connection.
7. Install the discharge pipe (195), pipe nuts (242), and flange (195S, if used).
Make sure that the pipe nuts are tight and that there is no strain on the pump.
8. Rotate the shaft by hand in order to make sure that there is no binding.
9. Connect all auxiliary piping.
10. Replace the pump half coupling hub (233) and lubricate the pump bearings.
Maintenance (Continued)
Model 3171 Installation, Operation, and Maintenance Manual 47