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SECTION 6 ITEM 340 |
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DATED JUNE 1998 |
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SUPERSEDES ITEMS 341, 342, 344 |
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DATED MARCH 1992 |
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INSTRUCTION AND REPAIR MANUAL |
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6 |
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MODELS 341A, 342A AND 344A |
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NOTE
This repair manual is applicable to pump Models 341A, 342A and 344A. All photos illustrate Model 344A.
A TTENTION: SAFETY W |
ARNINGS |
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Read and understand all warnings before installation or servicing pump.
Warning: Spraying Water Hazard
When servicing pump replace all gaskets and seals. Do not re-use old gaskets or seals. Failure to follow these instructions could result in serious personal injury, death or property damage.
OPERATIONAL LIMITS |
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Maximum Operating Pressure: |
175 psi at Temperatures |
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to 150 O F (65.6°C) |
Maximum Operating Temperature: |
225°F (107°C) |
* See ASTM A126/ANSI B16.1 for pressure/temperature ratings of flanges.
ELECTRICAL SAFETY:
Warning: Electrical Shock Hazard
All electrical connections are to be made by a qualified electrician in accordance with all codes and ordinances. Failure to follow these instructions could result in serious personal injury, death or property damage.
Warning: Electrical Overload Hazard
Insure all motors have properly sized overload protection. Failure to follow these instructions could result in serious personal injury, death or property damage.
Warning: Sudden Start-Up Hazard
Disconnect and lockout power source before servicing. Failure to follow these instructions could result in serious personal injury, death or property damage.
HIGH TEMPERATURE SAFETY:
Warning: Hot Surface Hazard
If pumping hot water, insure guards or proper insulation is installed to protect against skin contact to hot piping or pump components. Failure to follow these instructions could result in serious personal injury, death or property damage.
HIGH PRESSURE SAFETY:
Warning: High Pressure Hazard
The pump is rated at a maximum of 175 psi at 150°F. Do
not exceed this pressure. Install properly sized pressure relief valves in system. Failure to follow these instructions could result in serious personal injury, death or property damage.
Warning: Expansion Hazard
Water expands when heated. Install properly sized thermal expansion tanks and relief valves. Failure to follow these instructions could result in serious personal injury, death or property damage.
SERVICE
Your Aurora pump requires no maintenance other than periodic inspection, occasional cleaning and lubrication of bearings (MODEL 344A only). The intent of inspection is to prevent breakdown, thus obtaining optimum service life. The liquid end of the pump is lubricated by the fluid being pumped and therefore does not require periodic lubrication. The motor, however may require lubrication, in which case, the motor manufacturer’s recommendation should be followed.
LUBRICATION OF IMPELLER SHAFT BEARINGS
The MODEL 344A pump is available with three options for lubricating the shaft bearings. They are:
1.Regreasable (standard)
2.Oil Lubrication
3.Sealed Bearings, Permanent Lubrication
Regreasable bearings will require periodic lubrication and can be accomplished by using the zerk or lubrication fittings in the cartridge cap and power frame. Lubricate the bearings at regu-
lar intervals using a grease of high quality. Polyurea base
© 1992 AURORA PUMP NO. AURORA, ILLINOIS
grease is recommended as lubricants for pumps operating in both wet and dry locations. Mixing of different brands of grease should be avoided due to possible chemical reactions between the brands which could damage the bearings. Accordingly, avoid grease of vegetable or animal base which can develop
acids, as well as grease containing rosin, graphite, talc and other impurities. Under no circumstances should used grease
be reused.
Over lubrication should be avoided as it may result in overheating and possible bearing failure. Under normal application, adequate lubrication is assured if the amount of grease is main-
tained at 1/3 to 1/2 the capacity of the bearing and adjacent space surrounding it.
In dry locations, each bearing will need lubrication at least every 600 hours of running time or every 6 to 12 months, whichever is more frequent. In wet locations the bearings should be lubricated at least after every 300 hours of running time or every 4 to 6 months, whichever is more frequent. A unit
is considered to be installed in a wet location if the pump and motor are exposed to dripping water, to the weather, or to heavy condensation such as is found in unheated and poorly ventilated underground locations.
Oil lubricated bearings are optional on MODEL 344 pumps. A fixed oil level is maintained with the power frame by an oiler which allows visual indications of reserve oil.
At initial installation and before starting a unit that has been shut down for repairs or for any extended length of time, run enough 10W-30 weight motor oil through the oiler to maintain a constant oil level to insure that the bearing will never be without an oil supply. Oil will have to be added at intervals to maintain a constant level in the oiler. This interval can only be determined by experience.
Under working conditions, oil will breakdown and need to be replaced at regular intervals. The length of these intervals will depend on many factors. Under normal operation, in clean and
dry locations, the oil should be changed about once a year. However, when the pump is exposed to dirt contamination, high temperatures (200°F. or above) or a wet location, the oil may have to be changed every 2 to 3 months.
MODELS 341A-342A-344A
CAUTION
Use normal fire caution procedures when using any petroleum cleaner.
REPAIRS
Before starting any work, insure the electrical power is locked out, the system pressure has been lowered to 0 psi and temperature of the unit is at a safe level.
The pump may be disassembled using the illustrations and text provided. Although complete disassembly is covered, it will seldom be necessary to completely disassemble your Aurora pump.
The illustrations accompanying the disassembly instructions show the pump at various stages of disassembly. The illustrations are intended to aid in the correct identification of the parts mentioned in the text.
Inspect removed parts at disassembly to determine if they can
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reused. Ball bearings that turn roughly or show wear should |
be |
replaced. Cracked castings should never be reused. Scored or |
worn pump shafts should be replaced. Gaskets should be replaced at reassembly simply as a matter of economy. They are
much less expensive to |
replace routinely than to replace singly |
as the need arises. |
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Warning: |
Sudden Start-Up Hazard |
Disconnect and lockout power source before servicing. Failure to follow these instructions could result in serious personal injury, death or property damage.
Warning: Hot Surface Hazard
If pumping hot water, insure guards or proper insulation is installed to protect against skin contact to hot piping or pump components. Failure to follow these instructions could result in serious personal injury, death or property damage.
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Warning: |
High Pressure Hazard |
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The pump is rated at |
a maximum of 175 psi at 150°F. Do |
Model 344A |
not exceed this pressure. Install properly sized pressure |
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relief valves in system. Failure to follow these instructions |
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Model 342A |
could result in serious personal injury, death or property |
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damage. |
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Model 341A |
Warning: |
Spraying Water Hazard |
A. Assembled Units. |
When servicing pump |
replace all gaskets and seals. Do not |
re-use old gaskets or seals. Failure to follow these instruc- |
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tions could result in serious personal injury, death or proper- |
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ty damage. |
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DISASSEMBL Y
Disassemble only what is needed to make repairs or accomplish inspection. (See Figure 2 for Model 341A, Figure 3 for Model 342A and Figure 3 for Model 344A.)
1.Disconnect and lockout power source to prevent drive unit from being energized during disassembly.
2.Unscrew the two drain plugs (4) from the casing (6). On Model 342A pumps, remove plugs (74 and 75) to drain pump. Also unscrew the two plugs (4) from casing (6).
3.Remove all relief, cooling, flushing or drain lines from
pump, including compression connections (1 and 2) and tubing (3). Break suction and discharge connections unless it is intended to remove the power frame or motor assembly and leave casing (6) in the line. On Model 342A pumps,
break discharge connections only, unless it is desired to remove base (73). Remove capscrews (39) and lift pump assembly from base (73). Remove gasket (72).
4. On Model 344A pumps, remove the flexible coupling from between the pump and motor. Next unscrew the bolts that hold support(s) (41 and 64) to the base and slide the pump out to be worked on.
5.Remove capscrews (5) and pull casing (6) from bracket (35). Remove gasket (8).
6.Unscrew impeller screw (9) and remove washer (9A), taking care not to damage gasket (9B) or capscrew seal (9C).
MODELS 341A-342A-344A
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C. Impeller and Key Removed. |
9. Impeller |
wearing |
rings (optional - 14 and 15) are pressed |
on and must |
be cut |
off if replacement is necessary. If they |
are turned off in a lathe, take care not to cut into the impeller.
10.Slide sleeve (25) with rotating parts of mechanical seal (27) from the shaft. The sleeve should be carefully cleaned to remove any residue that may be remaining in the seal area.
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rubber in seal (27) may have become partially adhered |
to |
the sleeve. The sleeve must also be checked for abrasion |
or corrosion that can occur when fluid residue penetrates between the seal (27) and sleeve (25). The sleeve under the seal may be polished lightly to a 32 RMS finish before reassembly. Do not reuse a pitted sleeve. Pin (61) may be removed if necessary.
CAUTION
The mechanical seal (see Figure 1) is a precision product and must be treated as such. During removal, great care must be taken to avoid dropping any part of the seal. Take particular care not to scratch the lapped faces on the washer or the sealing seat. If any wear of the seal faces is noted, it is recommended to replace with a new seal during reassembly.
B.Casing, Gasket, and Wearing Ring Removed.
7.Slide impeller (11) and impeller key (12) from the shaft, again taking care not to damage gasket (10) located behind impeller. Remove gasket (10).
8. Wearing ring(s) (7 and 16) are pressed into their housings
with an interface fit and must be removed with |
a puller. |
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New ring(s) should be used for reassembly since it is likely |
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that during |
removal this fit will be lost. Do |
not remove |
wearing rings |
if not being replaced. |
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D.Mechanical Seal Removed.
11.On Model 344A pumps, remove capscrews (39 and 62) and
washers (40 and 63) to take off support feet (41 and 64). On Model 341A frame size 143 thru 184-JM only, unscrew capscrews (39) washers (40) and remove support (41) from bracket (35).
12.Unscrew capscrews (32) to remove bracket (35) from frame
(57)or motor on Models 341A and 342A.
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