AMT 2820-98 Assembly instructions

[Type text]
2761-257-00 1
2/2015
Specifications Information and Repair Parts Manual 2820-98, 2820-99, 2760-99, & 2761-99
x
Please read and save this Repair Parts Manual. Read this manual and the General Operating Instructions carefully before attempting to assemble,
install, operate or maintain the product described. Protect yourself and others by observing all safety information. The Safety Instructions are contained
in the General Operating Instructions. Failure to comply with the safety instructions accompanying this product could result in personal injury and/or
property damage! Retain instructions for future reference. AMT reserves the right to discontinue any model or change specifications at any time without
incurring any obligation.
©2015 AMT Pump Company, A Subsidiary of The Gorman-Rupp Company, All Rights Reserved.
Periodic maintenance and inspection is required on all pumps to insure proper operation. Unit must be clear of debris and sediment. Inspect for leaks and loose bolts. Failure
to do so voids warranty.
Self-Priming Centrifugal Pedestal Pumps
High Volume Dewatering Cast Iron and Stainless Steel Models
Refer to pump manual 1808-635-00 for General Operating and Safety Instructions.
DESCRIPTION
These self-priming (to 20 ft. lift) centrifugal pumps are heavy-duty units designed for the high volume liquid transfer involving irrigation, dewatering, lawn
sprinkling, etc. . Pumps are equipped with a flapper valve (to eliminate re-priming after each use) and a clog-resistant impeller which enables the pumps
to handle semi-solids (up to 3/8” dia.) and sediment laden liquids. Handle liquids from 40º to 180º F (4º to 82º C). For use with non-flammable, non-
abrasive liquids compatible with pump component materials.
Units can be installed with direct-coupling drive or pulley drive and can be driven by electric motor or gasoline engine.
For further pump information, see Specifications, Performance and Pulley Drive Charts.
Specifications
Description
Model 2820-98
Model 2820-99
Model 2760-99
Model 2761-99
Suction Inlet
1 ½" NPT
1 ½" NPT
2" NPT
2" NPT
Discharge Outlet
1 ½" NPT
1 ½" NPT
2" NPT
2" NPT
Shaft Diameter
3/4"
5/8"
3/4"
3/4"
Keyway
3/16" x 3/32" x 1⅞
3/16" x 3/32" x 3/4"
3/16" x 3/32" x 1⅞
3/16" x 3/32" x 1⅞
Dimensions (overall)
14½" L x 7⅜" W x 10" H
10½" L x 7⅜" W x 10⅛" H
15¾" L x 7⅜" W x 10⅞" H
15¾" L x 7⅜" W x 10-15⁄16"
H
Weight (approximate)
33 lbs.
32 lbs.
44 lbs.
46 lbs.
Basic Construction
Stainless Steel
Cast Iron
Cast Iron
Stainless Steel
Seal
Viton elastomers, ceramic
seat, carbon head, and
stainless spring.
Buna-N elastomers, ceramic
seat, carbon head, and
stainless spring.
Buna-N elastomers, ceramic
seat, carbon head, and
stainless spring.
Viton elastomers, ceramic
seat, carbon head, and
stainless spring.
IMPORTANT: Find desired pump speed in accordance with the performance chart. Select driver with the proper RPM and corresponding pulley size.
The chart covers both models.
Pulley Drive Chart
Pump Speed RPM
Motor Speed
* Pulley Diameter Motor
Pump
1725
1725 RPM 3"
3"
3450 RPM
2 ½"
5"
2300
1725 RPM 4"
3"
3450 RPM
3"
4 ½"
2800
1725 RPM
4"
2 ½"
3450 RPM
2 ½"
3"
3450
1725 RPM
6"
3"
3450 RPM
3"
3"
(*) All A Section, Single Groove

[Type text]
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Specifications Information and Repair Parts Manual 2820-98, 2820-99, 2760-99, & 2761-99
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Self-Priming Centrifugal Pedestal Pumps
High Volume Dewatering Cast Iron and Stainless Steel Models
Performance Chart
Min.
GPH at Total Head in Feet
Pump
Motor
*Max.
Model
RPM
Required
10'
20'
30'
40'
50'
60'
70'
80'
90'
Head
2820-99,
1725
1/2 HP
2,580
600
−
−
−
−
−
−
−
22 ft.
2820-98
2300
3/4 HP
4,200
3,000
1,260
−
−
−
−
−
−
34 ft.
2800
1 HP
-
4,380
3,600
2,400
600
−
−
−
−
52 ft.
3450
2 HP
-
6,360
5,880
5,280
4,500
3,600
2,400
1,200
−
88 ft.
2760-99,
1725
1/2 HP
3,120
-
−
−
−
−
−
−
−
16 ft.
2761-99
2300
1 HP
5,040
3,540
1,440
−
−
−
−
−
−
33 ft.
2800
1 ½ HP
-
5,650
4,440
2,940
600
−
−
−
−
52 ft.
3450
3 HP
-
8,100
7,320
6,000
5,100
4,260
3,000
1,260
−
84 ft.
(*) Shut-off; to convert to psi, divide by 2.31.
MAINTENANCE
Make certain that unit is disconnected from power source before
attempting to service or remove any components!
MECHANICAL SEAL REPLACEMENT
Refer to Figures 1, 1A and 2
IMPORTANT: Always use a new casing gasket whenever the unit is
disassembled.
The precision lapped faces on the mechanical seal are easily
damaged. Handle replacement seal carefully.
1. Remove the casing (Ref. No. 5) and gasket (Ref. No. 11) by
removing the fasteners (Ref. No. 23) that attach the casing
to the adapter (Ref. No. 19) or bearing housing (Ref. No.
12).
2. Remove the impeller (Ref. No. 6) and shims (Ref. No. 7) by
unscrewing it counterclockwise, facing impeller.
3. Carefully remove seal head (Ref. No. 9).
NOTE: For Model 2760-99, remove shaft sleeve (Ref. No. 8) also.
4. Remove the seal seat (Ref. No. 10) from the cavity in the
adapter or the bearing housing using two screwdrivers or
other suitable tools.
IMPORTANT: Always replace both the seal seat and the seal head to
insure proper mating of components.
5. Thoroughly clean the shaft surface and all surfaces of the
seal seat cavity in the adapter or bearing housing.
6. Coat the inside of the seal cavity and the outside of the
rubber cup gasket on the seal seat with soapy water.
The polished portion of seal seat should be kept clean. HANDLE
CAREFULLY!
7. Push the seal seat into cavity, seating it firmly and squarely
with FINGER PRESSURE ONLY. DO NOT use a
screwdriver or any other tool that could mark the precision
lapped face.
8. Coat inside of the shaft sleeve with clean cup grease or
Vaseline. (Model 2760-99 only.) Remove excess grease.
DO NOT touch the polished face of seal head (Ref. No. 9). Seal
head should be kept clean.
9. Wet the inside rubber portion of seal head with soapy water.
10. Slide the seal head onto the shaft sleeve or pump shaft (Ref.
No. 14) with polished face towards polished seal seat.
11. Replace shims and impeller. (See Shim Adjustment.)
12. Remount gasket and casing.
13. After assembly, turn pump shaft by hand slowly, to check for
striking of the impeller on the casing. If rubbing or striking
occurs, adjust impeller shims as required (See Shim
Adjustment).

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BEARING HOUSING SERVICE FOR MODELS
2760-99, 2820-98 AND 2761-99
1. Remove the front pump assembly as described under
Mechanical Seal Replacement (Steps 1, 2 & 3).
2. Disassemble the bearing housing (Ref. No. 12) from pump
adapter (Ref. No. 19) by removing the four hex head cap
screws (Ref. Nos. 20 and 21).
3. Remove the shaft bearing (Ref. No. 22) and shaft (Ref. No.
14) as an assembly by first removing the snap ring (Ref. No.
17). Push the shaft bearing assembly out of the bearing
housing by rapping on the threaded end of the shaft with a
soft mallet, or block of wood and a hammer.
4. The ball bearings can now be removed from the shaft.
5. If shaft bearings have been removed from shaft, replace by
sliding bearing on shaft to shoulder. Replace shaft bearing
assembly by sliding assembly into housing threaded end
first. Push shaft bearing assembly completely in by gently
tapping on keyway end of shaft with a soft mallet. Replace
snap ring.
6. Reverse steps 1 thru 3 to reassemble pump.
IMPORTANT: After pump is assembled, it is necessary to rotate pump
shaft by hand to check for striking of the impeller. If striking or rubbing
occurs, adjust impeller shims as required (See Shim Adjustment).
BEARING HOUSING SERVICE FOR MODEL 2820-99
1. Remove the front pump assembly as described under
Mechanical Seal Replacement (Steps 1, 2 & 3).
2. Remove the shaft bearing assembly (Ref. No. 14) by first
removing the snap ring (Ref. No. 17). Push the shaft bearing
assembly out of the bearing housing by rapping on the
threaded end of the shaft with a soft mallet, or block of wood
and a hammer.
3. Flinger washer (Ref. No. 13) will come loose at this time.
4. Replace shaft bearing assembly by sliding assembly into the
housing, threaded end first. Push shaft bearing assembly
completely in by gently tapping on keyway end of shat with a
soft mallet. Replace snap ring.
5. Reverse steps 1 thru 3 to reassemble pump.
IMPORTANT: After pump is completely assembled it is necessary to
rotate pump shaft by hand to check for striking of the impeller. If
striking or rubbing occurs, adjust impeller shims as required (See Shim
Adjustment).
SHIM ADJUSTMENT
When installing a replacement impeller (Ref. No. 6), it may be
necessary to vary the number of shims (Ref. No. 16) that will be
required. This is done by adding one shim more than was removed
and reassembling the pump as follows:
IMPORTANT: When the clearance between the impeller and casing
(Ref. No. 5) exceeds 1/16" at the face of the impeller or 1/8" on the
outside diameter of the impeller, it may be necessary to take corrective
action.
1. Insure that the casing is snugly in place and check the shaft
(Ref. No. 14) to make sure it is turning freely. If it turns
freely, check to insure that the adapter (Ref. No. 19) or
bearing housing (Ref. No. 12) and casing are firmly seated,
compressing gasket (Ref. No. 11) where they meet on the
outside. If a gap exists, tighten the fasteners (Ref. No. 1) and
recheck the shaft for free turning. Tighten carefully, turning
shaft while tightening. If shaft seizes before fasteners are
completely tight, disassemble pump and remove one shim
and repeat reassembly.
2. If at any time during shim adjustment the shaft does not turn
free or the impeller strikes when turning the shaft, repeat
Shim Adjustment procedure.

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Specifications Information and Repair Parts Manual 2820-98, 2820-99, 2760-99, & 2761-99
x
Please provide following information:
-Model Number
-Serial Number (if any)
Part description and number as shown in parts list
For Repair Parts contact dealer where pump was purchased.
Figure 2 –Repair Parts Illustration

[Type text]
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Specifications Information and Repair Parts Manual 2820-98, 2820-99, 2760-99, & 2761-99
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Repair Parts List
Ref.
Part Number for Models:
No.
Description
2820-98
2820-99
2760-99
2761-99
Qty.
1
1/4" - 20 UNC x 3/4" SS Hex Head Cap Screw
N/A
*
*
N/A
6
1/4" - 20 UNC x 3/4" SS Hex Head Cap Screw
*
N/A
N/A
N/A
4
5/16" - 18 UNC x 7/8" SS Hex Head Cap Screw
N/A
N/A
N/A
*
4
2
Suction Plate
2820-050-00
1501-000-01
1487-000-01
2760-050-01
1
3
Flapper Valve Assembly
2820-304-90
1674-000-90
1683-000-90
2760-304-90
1
4
1/2" NPT Pipe Plug
*
*
*
*
3
5
Casing Kit
1497-003-00
1497-000-02
1484-000-01
2760-003-01
1
6
Impeller
2823-010-02
2820-011-05
1493-000-01
2823-010-06
1
7
Impeller Skim Kit
1657-000-90
1657-000-90
1658-000-90
1657-000-90
1
8
Shaft Sleeve
N/A
N/A
1483-000-00
N/A
1
9,10
Seal Assembly, Buna-N
1640-161-90
(opt.)
1640-161-90
(std.)
1640-162-90
(std.)
1640-161-90
(opt.)
1
Seal Assembly, Viton
1640-161-91
(std.)
1640-161-91
(opt.)
1640-162-91
(opt.)
1640-161-91
(std.)
1
11
Gasket
1470-011-00
1478-000-00
1478-000-00
1470-011-00
1
12 Bearing Housing 3890-090-09 1500-000-01
1695-030-01
3890-090-09
1
13 Slinger Washer (not required) 1534-000-00 1534-000-00
N/A
1534-000-00
1
14
Pump Shaft
1696-066-00
1509-140-90
1695-001-00
1696-066-00
1
15 3/16" x 3/16" x 3/4" Key 1517-000-00 1517-000-00
1517-000-00
1517-000-00
1
16 Bearing Shim Kit 1696-008-90 1696-003-90
1696-008-90
1696-008-90
1
17 Snap Ring 1695-034-00 1516-000-00
1695-034-00
1695-034-00
1
18 3/8" - 16 UNC Hex Flange Nut N/A N/A
*
N/A
4
19 Adapter 2820-031-01 N/A
1474-000-01
2820-031-01
1
20 3/8" - 16 UNC x 1-1/4" Hex Head Cap Screw N/A N/A
*
N/A
2
3/8" - 16 UNC x 3/4" Hex Head Cap Screw * N/A
N/A
*
4
21 3/8" - 16 UNC x 1-3/4" Hex Head Cap Screw N/A N/A
*
N/A
2
22
Bearing
1695-031-00
N/A
1695-031-00
1695-031-00
2
23
1/4" - 20 UNC x 3/4" SS Hex Head Cap Screw
N/A
*
*
N/A
6
3/8" - 16 UNC x 1" SS Hex Head Cap Screw
*
N/A
N/A
*
4
(*)
Standard Hardware Item, Available Locally
()
Seal assembly available as set only (includes seal head and seat).

Specifications Information and Repair Parts Manual
NOTES:

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