Goulds Pumps 3700 - IOM - Manual (Page 98)

Maintenance
6. Disengage the spacer ring or clips.
7. Verify that the shaft turns freely.
If you detect rubbing or excessive drag, then determine the cause and correct it.
Determining impeller spacer thickness (applicable for 3703/3700LF)
Applicable only to a new spare impeller spacer
With an assembled power end:
1. Attach the seal chamber cover to the bearing frame.
2. Install impeller spacer as supplied between shaft and impeller.
3. Secure impeller to shaft with impeller cap screw or nut.
4. Place indicator on the coupling end of the shaft and zero it out (magnetic base attached to
bearing frame).
5. Remove (or loosen to provide 3/8” travel) the thrust bearing end cover screws.
6. Install back pull-out assembly into the case and tighten down 3 or 4 nuts (equally spaced
around the case).
7. Record the travel measured by the indicator.
8. Add .015" (3703) or .030” (3700LF) to the amount of travel measured and then machine
this off the face of the impeller spacer.
Install the impeller (3700/3710)
CAUTION:
Wear heavy work gloves when you handle impellers. The sharp edges can cause physical injury.
It is recommended that you repeat the runout checks on the seal-chamber cover face, lock, and
wear-ring surfaces as described in
Install the seal-chamber cover (page 91).
1. Install the impeller key in the keyway of the shaft.
The key should be at the top (12 o’clock) position for the impeller installation.
2. Install the impeller on the shaft.
Apply anti-galling compound to the impeller bore to aid in assembly and disassembly.
3. Install the impeller nut and tighten to the torque values shown in the Maximum torque
values for 3700 fasteners table.
The impeller nut has left-hand threads.
4. Tighten the set screw in the end of the impeller nut.
5. Verify that the shaft turns freely.
If you notice any rubbing or excessive drag, then determine the cause and correct it.
It is recommended that you repeat the runout checks on the impeller wear-ring surface as
described in Replace the wear rings.
Install the impeller (3703)
CAUTION:
Wear heavy work gloves when you handle impellers. The sharp edges can cause physical injury.
It is recommended that you repeat the runout checks on the seal-chamber cover face and lock
surfaces as described in
Install the seal-chamber cover (page 91).
1. Install the impeller spacer on the shaft.
2. Install the impeller key in the keyway of the shaft.
The key should be at the top (12 o’clock) position for the impeller installation.
3. Install the impeller on the shaft.
Apply anti-galling compound to the impeller bore to aid in assembly and disassembly.
96 Model 3700, API Type OH2 / ISO 13709 1st and 2nd Ed. / API 610 8/9/10/11th Ed. Installation, Operation, and Maintenance
Manual