PAGE 12 | MAINTENANCE (continued) |
4. PACKING BOX
CAUTION: DO NOT TIGHTEN THE GLAND TO STOP ALL LEAKAGE. LEAKAGE IS NECESSARY TO ENSURE THE COOLING, FLUSHING AND LUBRICATION OF THE PACKING AND TO PREVENT SHAFT SLEEVE DAMAGE.
The packing boxes on Aurora Pumps are packed at the factory. All packing is subject to wear and should be given regular inspections and, if necessary, periodic adjustments. Generally, packed box pumps require inspection of the packing and adjustments to the glands after each 150 hours of operation.
Adjustment is made by lightly tightening the gland nuts, then loosening them so that they can be adjusted with finger pressure to allow a small flow of liquid to lubricate the packing. If the flow of liquid has increased and cannot be reduced by a slight tightening of the gland, replace the packing and/or shaft sleeve.
The packing boxes may be fitted with lantern rings. When a lantern ring is furnished, the sealing chamber should be connected to a source of clear fresh water.
5. PACKING REPLACEMENT
Use a good grade of soft, square long fiber packing, thoroughly graphited. The replacement procedure should be as follows:
A.Stop the pump.
B.Unbolt and remove the glands away from the packing.
C.Use a packing hook to remove the worn rings of packing and lantern rings. Note the location of the lantern rings relative to the amount of packing on each side of the lantern rings. (See sectional drawings on pages 22 & 23.)
D.Clean the packing boxes and shaft sleeves.
E.Inspect the shaft sleeves for wear or rough finish and replace if necessary.
CAUTION: STAGGER THE PACKING END JOINTS 180 AND FIRMLY SEAT THE PACKING. THE FOLLOWING TABLE GIVES THE PERTINENT PACKING BOX, LANTERN RING AND PACKING DIMENSIONS (see page 13).
F.Install new packing and lantern rings.
G.Reinstall the glands and tighten the gland nuts.
H.Loosen the gland nuts so they can be adjusted with finger pressure to obtain correct leakage for lubrication after