AMT 2820-98, Specifications Information And Repair Parts Manual, Page: 2 / 8

[Type text]
2761-257-00 2 2/2015
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).