8.
After packing and seal cage are properly installed, insert gland into stuffing box. Tighten gland nuts
finger-tight only. Shaft should turn freely.
NOTICE:
Do not over tighten gland nuts. Packing may set permanently and require removal. Over tight-
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.
9.
Follow pump start-up procedure. Turn on stuffing box lubricating liquid and start pump.
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 adjustments to re-
duce leakage. Allow adequate run-in time between adjustments. Acceptable leakage is 30-50 drops
per minute.
11. Periodic maintenance is absolutely required for all packed pumps.
Normal shaft run-out should be under 0.127mm | .005" to avoid pounding of stuffing box packing.
With excessive shaft run-out, shaft straightening or replacement is necessary.
4.2.1 Mechanical seals
WARNING:
•
The mechanical seal used in an ATEX classified environment must be properly certified.
•
The mechanical seal must have an appropriate seal flush system. Failure to do so will re-
sult in excess heat generation and seal failure.
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 replacement 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.
4.2 Packing procedure
22
Model JC Installation, Operation and Maintenance Instructions
