Goulds Pumps 3500XD - IOM - Manual (Page 35)

3500XD IOM 8/07
31
DISASSEMBLY
s
! WARNING
Lock out driver power to prevent accidental start-up and
physical injury.
The back pullout feature of this pump allows the complete
back pullout assembly (bearing frame and rotating element)
to be removed without disturbing suction or discharge piping
or driver.
The sectional and parts list contains a complete sectional
view of the pump and parts list with the proper identification
numbers. Refer to this section as required
during maintenance procedures and when ordering spare or
repair parts.
To prepare for disassembly, proceed as follows:
1. Lock out power supply to motor.
2. Shut off all valves or equipment controlling flow to and
from the pump.
s
! WARNING
Lock out driver power to prevent accidental start-up and
physical injury.
s
! WARNING
Pump and components are heavy. Failure to properly lift
and support equipment could result in serious physical
injury or damage to pumps. Steel toed shoes must be
worn at all times.
s
! WARNING
Only trained personnel should do lifting. Pumps and
motors often have integral lifting eyes or eye bolts. These
are intended for use in lifting the individual pieces of
equipment only. Failure to properly lift equipment could
result in serious physical injury or damage to equipment.
3. Remove all auxiliary tubing and piping.
4. Flush the pump to remove corrosive or toxic pumpage if
required.
5. Drain liquid from standpipe.
6. Disconnect coupling and remove coupling spacer (refer
to coupling instructions).
7. Drain oil.
8. If unit has stuffing box packing, remove the gland stud
nuts. The gland is in two halves and can be removed.
l
! CAUTION
Never remove the back pull-out assembly unassisted,
physical injury can occur.
To remove the back pullout assembly, proceed as follows:
s
! WARNING
Pump components can be heavy. Proper methods of
lifting must be employed to avoid physical injury and/or
equipment damage. Steel toed shoes must be worn at all
times.
1. Place chain or sling from crane or hoist through frame
adapter (108).
2. Remove frame foot hold-down bolts.
3. Remove bolts (370) which hold frame adapter to casing.
4. Adjust sling tension to support back pullout assembly.
5. Slide the back pullout assembly from the casing. The
Model 3500XD has jacking bolts (418) to assist
disassembly. Screw the jacking bolts into the tapped
holes in the frame adapter. Tighten bolts evenly, a flat at
a time, to jack back pullout assembly from casing.
If working space is available to the side of the baseplate, the
“pullout assembly” can be turned perpendicular to the
baseplate. Replace one pedestal hold-down bold in baseplate
and support the bearing frame flange with blocks. Complete
disassembly of the “pullout assembly” can be accomplished
on the job site. If preferred, it can be removed to an available
work area.
6. Remove casing gasket (351).
NOTE: Ensure that casing gasket is not damaged.
7. Secure shaft from rotating at the coupling end and loosen
and remove the X-Ducer nut (304). Do not lose or
damage the X-Ducer o-ring (412A).
Remove the X-Ducer (274F) from the shaft. Careful
prying may be necessary. Remove key (178B).
Remove the impeller (101) by carefully prying at the
back side at 2 points 180 degrees apart.
8. Remove impeller key (178) from the shaft.
Do not lose or damage the shaft o-rings (496B and
496C).
9. Remove the repeller (262). Do not lose or damage the
shaft o-rings (412F).
10. If unit has a mechanical seal, remove gland stud nuts.
The gland is a solid ring and cannot be removed after
6