AMT Pumps 3270 Assembly instructions

3270-250-00
3-Inch Solids-Handling Pumps
Please read and save this Repair Part 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.
Specifications Information 3270, 3272, 3274, 327A, 327B,
and Repair Part Manual 3390, 3391, 3393 and 3394
Performance Chart GPH of Water at Total Head in Feet *Max.
Model 10' 20' 30' 40' 50' 60' 70' 80' 90' Head
3270, 3272, 3274, 327A, 327B 13,000 12,000 11,260 10,020 8,765 7,260 5,250 3,180 — 89 ft.
3390, 3391, 3393, 3394 18,000 16,740 15,580 14,220 12,880 10,980 9,300 7,200 4,500 100
(*) Shut-off; to convert to psi, divide by 2.31
Maintenance Always disconnect
battery cables and
spark plug wire from spark plug before
performing any maintenance operation
requiring disassembly of the pump.
MECHANICAL SEAL REPLACEMENT
Refer to figures 1, 2A and 2B.
NOTE: Always replace seal assembly
(Ref. No. 7) and shaft sleeve (Ref. No. 8)
to ensure proper mating of mechanical
seal components (models 327A & 327B
have no shaft sleeve).
1. Remove pump casing (Ref. No. 2),
gasket (Ref. No. 9) and impeller (Ref.
No. 5).
2A. Remove the shaft sleeve with the
seal head on it.
2B. (327A & 327B) remove seal head
from rear of impeller.
3. Remove the adapter (Ref. No. 10)
and push seal seat from adapter
recess with a screwdriver.
4. Thoroughly clean all surfaces of the
adapter recess.
5. Using a clean cloth, wipe the
polished surface of the seal head.
6. Wet the rubber portion of the new
seal with a light coating of soapy
water. Press seal seat squarely into
adapter recess. Avoid scratching the
white ceramic surface.
NOTE: Handle all seal parts with ex-
treme care and attention to keeping
them clean. Do not touch seal faces
(either ceramic or carbon) with your
hands. Do not put lubricants of any kind
on seal faces. This can cause the seal to
leak.
7. Inspect the ceramic face of the seal
seat and carbon face of the seal
head to ensure they are clean and
not marred.
8A.Wet the inside rubber portion of the
Description
These centrifugal pumps are high capacity, engine driven, self-priming (to 20 ft.
lift), portable units. Shipped completely assembled. Equipped with precision lapped
mechanical seal to reduce the likelihood of leakage, and a clog resistant cast iron
impeller and wear plate capable of handling solids up to 3/4" in diameter. Suction
and discharge ports are 3" NPT female pipe thread.
Pumps are designed for operation involving irrigation and dewatering of
excavations, basements, etc. Handle liquids from 40° to 180° F (4° to 82° C). For use
with nonflammable, non-abrasive liquids compatible with pump component
materials.
Model 327A-95 pump is constructed of cast iron with Viton mechanical seal
components. Viton is recommended for pumping alachlor herbicides (e.g.
Monsanto Lasso®) or other compatible liquids.
Refer to form 1808-633-00 for General Operating and Safety Instructions.
11/2002
Specifications (Inches)
Cast Iron Wt. Aluminum Wt. Dimensions
Model No. (lbs.) Model No. (lbs.) †Shaft seal Engine L W H
3270-95 109 3270-96 71 Buna N/Carbon & Ceramic 51/2HP B&S Intek 22" 173/4"19
7/16"
3272-95 114 3272-96 80 Buna N/Carbon & Ceramic 61/2HP B&S Intek Pro 22 173/4197/16
3274-95 109 3274-96 75 Buna N/Carbon & Ceramic 51/2HP Honda GX 22 173/4197/16
327A-95 109 — — Viton/Carbon & Ceramic 5 HP Honda GC 22 173/4197/16
327B-95 109 — — Buna N/Silicon Carbide 5 HP Honda GC 22 173/4197/16
3390-95 138 3390-96 110 Buna N/Carbon & Ceramic 8 HP B&S Intek 271/2211/4233/16
3391-95 170 3391-96 122 Buna N/Carbon & Ceramic 9 HP Honda GX (E-start) 271/2211/4233/16
3393-95 138 3393-96 104 Buna N/Carbon & Ceramic 9 HP Honda GX 271/2211/4233/16
3394-95 160 3394-96 126 Buna N/Carbon & Ceramic 8 HP B&S I/P (E-start) 271/2211/4233/16
(†) Casing/adapter seal is paper gasket.

2
For Repair Parts, contact dealer where pump was purchased.
Please provide following information:
-Model number
-Serial number (if any)
-Part description and number as shown in parts list
Specifications Information
and Repair Part Manual
3270, 3272, 3274, 327A, 327B,
3390, 3391, 3393 and 3394
Figure 1 – Repair Parts Illustration
1
23
4
567
10
8
9
11
10
15
29
22
25
18
16
19
17
28
26
27
24
23
21
23
24
22
21
20
14
13
17
11 12
12

3
Specifications Information
and Repair Part Manual
Models 3270, 3272, 3274, 327A, 327B, 3390, 3391, 3393
and 3394
Repair Parts List Part Number for Model:
Ref. 5HP 5HP 8HP
No. Description 327A & 327B 327x 339x Qty.
1 3/4" NPT Pipe plug * * * 1
2 Casing (cast iron) 1990-007-09 1990-007-09 1990-007-09 1
(aluminum) — 1990-000-01 1990-000-0 1
3 Wearplate 1557-000-01 1557-000-01 1557-000-01 1
4 5/16"-18 UNC x 1/2" Flat socket head screw, stainless 1741-000-00 1741-000-00 1741-000-00 2
5 Impeller 1606-002-01 1606-001-01 1550-001-01 1
6 Impeller shims set contains I each: 0.010, 0.020, 0.030" 3827-172-90 1658-000-90 1656-000-90 1
7 Seal assembly, Buna-N — 1640-162-90 (std.) 1640-163-90 (std.) 1
Seal assembly, Buna-N/Silicon Carbide 1641-164-00 — 1640-163-00 (opt.) 1
Seal assembly, Viton 1641-163-00 1640-162-91 (opt.) 1640-163-91 (opt.) 1
8 Shaft sleeve — 1483-000-00 1555-000-00 1
9 Gasket 1546-000-00 1546-000-00 1546-000-00 1
10 Adapter 1604-030-01 1604-030-09 1545-030-09 4
11 3/8"-16 UNC x 11/4" Hex cap screw — — * 4
5/16"-24 UNF x 3/4" Flanged hex cap screw * * — 4
12 3/8" Split lockwasher — — * 4
13 Engine (327A & 327B) 1639-042-00 — — 1
(3270) — 1639-019-00 — 1
(3272) — 1639-018-00 — 1
(3274) — 1639-036-00 — 1
(3390) — — 1632-010-00 1
(3391) — — 1639-028-00 1
(3393) — — 1639-026-00 1
(3394) — — 1639-027-00 1
14 5/16"-18 UNC x 21/2" Hex head cap screw * * * 4
15 Engine raising block 1605-000-00 1605-000-00 1990-024-00 2
16 5/16"-18 UNC x 3/4" Flanged hex cap screw * * * 12
17 5/16"-18 UNC Flanged hex nut * * * 12
18 Rubber feet 1508-000-00 1508-000-00 1508-000-00 4
19 5/16"-18 UNC x 1" Hex flange screw * * * 4
20 Pump frame brace 1696-092-00 1696-092-00 1696-088-00 2
21 Outside rails 1696-099-00 1696-099-00 1696-087-00 2
22 Pump frame clamp 1696-091-00 1696-091-70 1696-091-70 8
23 1/4"-20 UNC x 3/4" Slotted hex flange screw * * * 8
24 1/4"-20 UNC Hex nut * * * 8
25 Engine mount 1696-055-00 1696-055-00 1696-086-00 1
26 1/4"-20 UNC Wing nut — — * 2
27 Battery holddown — — 3102-102-00 1
28 1/4"-20 UNC Holddown rod — — 3102-103-00 1
29 Battery base plate — — 3102-101-00 1
∆13" Battery cable — — 3102-104-90 1
∆30" Battery cable — — 3102-105-90 1
∆3" NPT Pipe nipple 1696-045-00 1696-045-00 1696-045-00 2
∆ † Suction strainer 1680-000-00 1680-000-00 1680-000-00 1
(∆) Not shown.
(*) Standard hardware item, available locally.
(†) Indicates optional equipment available.
(—) Not applicable.
NOTE: Wheel kits available separately. Order Model A735-90.

new seal head with a light coating
of soapy water. Slide head onto
shaft sleeve. Slip the shaft sleeve
with seal head onto the engine
shaft.
8B. (327A & 327B) Wet the inside rubber
portion of the new seal head with a
light coating of soapy water. Slide
head onto the rear of impeller.
NOTE: Reinstall any shims or spacers
that may have been removed onto
engine shaft or into impeller before
installing impeller.
9A.Screw impeller back in place, tight-
ening until it is against the shaft
shoulder.
9B. (327A & 327B) Screw impeller back
in place until it is against the end of
the engine shaft.
10. Replace adapter gasket and casing
and fasten with eight capscrews
(Ref. No. 16).
11. After assembly, turn engine shaft by
hand slowly, using recoil starter, to
check for striking of the impeller on
the casing. If striking or rubbing
occurs, adjust impeller shims (see
Shim Adjustment) as required, and
reconnect spark plug wire and
battery cables.
12. A short “run-in” period may be
neces-sary to provide completely
leak-free seal operation.
IMPELLER AND WEARPLATE
REPLACEMENT
Impeller (Ref. No. 5) and cutwater/
wearplate (Ref. No. 3) are subject to
wear only by abrasive action of sandy or
dirty fluid. If badly worn, all these parts
can be replaced easily, and the pump
thus restored to full efficiency.
NOTE: When the clearance between the
impeller and the cutwater/wearplate
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. The
increased clearance can cause length-
ened priming times and reduced pump-
ing capacity. If both the priming and
capacity of your unit are satisfactory for
your application, it is recommended
that no corrective maintenance be
performed regardless of what clear-
ances on your unit may have developed,
since the increased clearances in them-
selves are not generally harmful to your
pump. Normally, new pump clearances
can be restored by simply shimming
behind the impeller. (Add shim washers,
Ref. No. 6.) If the diameter of the
impeller is badly worn or if 1/16" shim
washers do not restore clearances to
less than the 1/16" face dimension
and/or the 1/8" diametral clearance, it is
recommended that the impeller be
replaced. This is usually all that is requi-
red since only on unusually abrasive
surfaces does the cast iron wearplate
show deterioration. Occasionally a
stone or hard object might get caught
in the impeller and cause damage to
the cutwater/wearplate. In these cases
follow the instructions below for repla-
cement and refer to Figure 1.
1. Detach pump casing (Ref. No. 2).
2. Remove the two flat head socket
screws (Ref. No. 4) in face of the
cutwater/ wearplate (Ref. No. 3).
3. The cutwater/wearplate can now be
removed from the casing.
4. Simply reverse the procedure to
install the replacement.
NOTE: Ensure that all parts are clean
before installation so that the new
cutwater/wearplate seats properly in
the casing.
SHIM ADJUSTMENT
When installing a replacement impeller
or mechanical seal, it may be necessary
to vary the number of shims (Ref. No. 6)
that will be required. This is easily done
by adding one 0.010” shim more than
was removed, and reassembling the
pump as described.
Ensure that the casing is snugly in place
and check the shaft to make sure it is
turning freely. If it turns freely, check to
ensure that the adapter (Ref. No. 10)
and the casing (Ref. No. 2) are fitted
tight together. If they are not, tighten
the fasteners (Ref. No. 16) and recheck
the shaft for free turning. Tighten
carefully, turning shaft while tighten-
ing. If shaft seizes before fasteners (Ref.
No. 16) are completely tight,
disassemble pump and remove one shim
and repeat reassembly.
If any time during the above operation
the shaft does not turn free, or a metal
to metal strike can be heard or felt
when turning the shaft, follow the
procedure indicated above and repeat
the procedure.
The above procedure ensures that the
pump will have the proper running
clearance (less than 0.010") between
the impeller and casing and perform
like a new unit with the new impeller or
motor.
3-Inch Solids-Handling Pumps
Specifications Information
and Repair Part Manual
3270, 3272, 3274, 327A, 327B,
3390, 3391, 3393 and 3394
Maintenance (Continued)
Figure 2A – Mechanical
Seal Replacement
Seal seat
Impeller
Shim
Seal head
Motor shaft
and sleeve
Adapter
Figure 2B – Mechanical
Seal Replacement
Seal seat
Impeller
Shim
Seal Head
Engine
Shaft
Adapter