Goulds Pumps 3996 - IOM - Manual (Page 41)

shaft or sleeve. Do not tighten set screws.
3. Assemble gland (250), gaskets, and stationary
seat and slide assembly on shaft or sleeve.
4. Place stuffing box cover (184) against frame
making sure that the studs (370H) align with the
proper holes in frame. Firmly tighten nuts.
5. Place gland assembly against face of stuffing
box and firmly tighten stud nuts.
6. Slide rotary portion toward gland until it contacts
stationary seat. Compress the rotary. Tighten
screws.
Double Seal
1. Assemble the gland (250), gaskets and stationary
seat. If unit has shaft sleeve (126), position
sleeve on shaft (122) and engage groove in
sleeve with drive pin (469) on shaft. Slide gland
assembly on shaft or sleeve.
2. Refer to the Additional Details section for
instructions on proper positioning of mechanical
seals.
3. Place inboard stationary seat and gaskets into
bottom of stuffing box.
4. Place stuffing box cover (184) against frame
making sure that studs (370H), align with proper
holes in frame. Firmly tighten nuts.
5. Refer to Step 10 for further instructions.
10. Screw impeller (101) with O-ring (412A) in place, on
the shaft (122).
11. On units with stuffing box packing (106), repack
stuffing box as outlined in the Foundation and Base-
plate Section. Assemble gland stud nuts finger tight.
12. Install and position coupling hub at scribe mark on
shaft.
13. Place casing gasket (351) against shoulder in casing.
14. Slide the pullout assembly into the casing (100).
Drain slot in stuffing box cover (184) should line up
with drain connection in casing. Install and tighten
the frame-to-casing. Install and tighten the
frame-to-casing. Install and tighten the
frame-to-casing. Make sure pump turns FREELY. If
not, adjust the impeller adjusting bolts (370C &
370D). Install and tighten the frame to casing bolts
(370) evenly while turning the pump by hand. Do
not jam the impeller into the casing.
15. Reset impeller clearances.
a. Loosen bolts (370 – C & D)
b. Tighten bolts (370C) while turning shaft until
impeller starts to rub against casing.
c. Loosen bolts (370C) until a 0.015 inch (0.375
mm) feeler guage can be placed between the bolt
head and the bearing housing.
d. Tighten bolts (370D) evenly. Bearing housing,
shaft and impeller will be jacked to proper
clearance from casing. Tighten bolts (370D) and
jam nuts on bolts (370D).
e. If desired, a dial indicator can be used instead of
a feeler gauge to check that the bearing housing
has been moved the correct 0.015 inch (0.375
mm) distance.
ADDITIONAL DETAILS
POSITIONING OF MECHANICAL SEALS
1. Place stuffing box cover (184) against frame (228),
making sure that the studs (370H) align with the
proper holes in frame. Firmly tighten nuts.
2. Correct location of the rotary portion of a mechanical
seal can be determined by two methods.
Scribe Method
a. Scribe the shaft (122) or sleeve (126) lightly at
the face of the stuffing box.
b. Remove the nuts or bolts and slide stuffing box
cover (184) away from the frame.
c. Lubricate rotary portion of seal and slide on
shaft or sleeve.
d. Compress rotary portion of seal to correct
dimension as shown on seal manufacturer’s
drawing and tighten set screws.
Modified Visegrip Method
a. Slide the gland assembly (250) against the
stuffing box. Do not damage seal face. Do not
bolt gland to stuffing box.
b. Clamp modified visegrip on the shaft (122) or
sleeve (126) directly against the gland.
c. Leaving visegrip in position, remove nuts or
bolts and slide stuffing box cover away from
frame adapter.
d. Lubricate rotary portion of seal and slide on
shaft (122) or sleeve (126).
3996 IOM 9/2010
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