10. A significant amount of lubricating liquid should leak from gland side of stuffing box. Operate
pump for at least 15 minutes before tightening gland nuts. Make small, even gland nut adjust-
ments to reduce leakage. Allow adequate run-in time between adjustments. Acceptable leakage
is 30-50 drops per minute.
NOTICE:
Do not over-tighten gland nuts. Packing may set permanently and require removal. Overtight-
ened packing causes excessive friction between packing and sleeve, and will result in dam-
aged components. A noticeable temperature increase in stuffing box would indicate insufficient
lubrication.
11. Periodic maintenance is absolutely required for all packed pumps.
Normal shaft run-out should be under .005" to avoid pounding of stuffing box packing. With excessive
shaft run-out, shaft straightening or replacement is necessary.
Mechanical Seals
Most mechanical seals are installed and adjusted at the factory. Due to size and design, some installed
mechanical seals are supplied with shipping retainers. Shipping retainers hold the sealing faces apart to
avoid damage during transport. Shipping retainers must be removed before shaft is to be rotated. Pumps
with retained seal faces will be specially marked and instructions from the seal manufacturer for retainer
removal will be provided.
Mechanical seals have a stationary and a rotating sealing face. Commonly, these sealing rings are of
carbon and ceramic material, brittle in nature, and easily damaged. As the sealing rings seat with the
operation of the pump, a compatible wear pattern develops between the mating surfaces. To disassem-
ble the mechanical seal after the wear pattern is established would necessitate the replacements of the
rotating and stationary sealing elements. Do not replace only one component.
To ensure the life and sealing characteristics of the mechanical seal, lubricating liquid must be circulated
through the stuffing box. Clear, grit-free liquid is necessary.
Special seal information and replacement seal elements should be provided by the seal manufacturer.
Goulds strongly recommends the stocking of replacement sealing elements.
CAUTION:
Do not make shaft adjustments on mechanical seal installations without consulting seal instruc-
tions and pump assembly drawing.
2.5 Pump Start-up
Bearing lubrication
Bearing must have adequate lubrication. Engage external lubrication system. Refer to “Bearing Frame
Assembly Section” of these instructions for specific information.
Shaft Rotation
The pump shaft must turn without any binding or rubbing. By manually turning the rotating element, only
the uniform frictional drag of the bearings and the stuffing box should be sensed.
Correct Rotation of the Driver
The direction of rotation of the driver must be checked before it can be coupled with the pump. The direc-
tion of rotation of the pump is indicated in a prominent location.
2.5 Pump Start-up
14
Model HS Installation, Operation, and Maintenance Manual
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