Specifications
Dimensions . . . . . . 22"L x 17
7
/
8
"W x 19
3
/
8
"H
Engine . . . . . . . 3
1
/
2
HP Briggs & Stratton
Weight . . . . . . . . . . . . . . . . . . . . . . 77 lbs.
Basic construction . . . . . . . . . . . . cast iron
Maintenance
To prevent acci-
dental starting
always remove the spark plug, or
disconnect and ground the spark plug
wire before attempting to service or
remove any component.
CLEANING
This unit has been designed with a
removable volute enabling the pump
to be cleaned or unclogged with ease.
Remove casing and volute as described
in steps 1 and 2 under MECHANICAL
SEAL REPLACEMENT. Remove any debris
found inside the unit, reassemble as
described in steps 16 and 17 under
MECHANICAL SEAL REPLACEMENT.
NOTE:
Depending on application it
may be necessary to remove suction and
discharge hoses.
MECHANICAL SEAL REPLACEMENT
Refer to Figures 1 and 2.
IMPORTANT:
Always replace the seal
seat (Ref. No. 5), seal head (Ref. No. 6),
and the shaft sleeve (Ref. No. 7) to
insure proper mating of mechanical seal
components!
1. Unthread cap screws (Ref. No. 14)
and remove casing (Ref. No. 12) and
o-ring (Ref. No. 4) from the adapter
(Ref. No. 3).
2. Unthread round head screws (Ref.
No. 15) and remove volute (Ref. No.
10) from adapter.
3. Unscrew impeller (Ref. No. 9) from
the engine shaft. Remove the im-
peller shim(s) (Ref. No. 8), shaft
sleeve, and seal head from engine
shaft.
NOTE:
To keep the shaft from turning,
remove the shroud from the engine and
hold the flywheel in place.
4.
Unthread hex flange screw (Ref. No.
2) and remove the adapter from the
engine mounting face.
5.
Push seal seat from the adapter
recess with a screwdriver.
6.
Clean the adapter recess before
inserting a new seal seat.
7.
Carefully wipe the ceramic surface
of the new seal seat with a clean
cloth.
8.
Wet the outside of the rubber
portion of the seal seat with a light
coating of soapy water.
9.
Press the new seal seat squarely into
the cavity in the adapter. Use finger
pressure only to avoid scratching
the seal seat. (This is a lapped
surface and must be handled very
carefully.)
10. After the seal seat is in place, insure
that it is clean and has not been
marred.
11. Using a clean cloth, wipe the
shaft and make certain that it is
perfectly clean.
12. Secure the adapter on the engine
mounting face.
Tighten hex flange
screws EVENLY to
avoid cocking rabbet on engine
mounting face.
13. Apply a light coating of soapy
water to the inside rubber portion
of seal head and slide onto the
shaft sleeve. Slip the shaft sleeve
with seal head onto the engine
shaft with the black carbon face
toward the white ceramic seal seat.
Do not touch or
wipe the face
of the polished surface part of the
seal head.
14. Replace any impeller shim(s)
removed in disassembly.
15. Screw impeller back in place,
tightening until it is against
the shaft sleeve.
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.
1
1
/
2
-Inch Solids-Handling Pump
Refer to form 1808-633-00 for General Operating and Safety Instructions.
3161-250-00
06/2005
Specifications Information and Repair Parts Manual
3161-95
Description
These centrifugal pumps are engine-driven, self-priming (to 20 ft. lift), portable
units, shipped completely assembled and mounted. Pumps include a clog resistant
impeller capable of handling solids as large as 3/8" diameter (up to 25% by
volume). A built-in check valve assists in priming and a mechanical shaft seal
prevents leakage. All seals are Buna N. Suction and discharge ports are 1
1
/
2
" NPT
female pipe thread. Handle liquids from 40º to 180º F (4º to 82º C). For use with
nonflammable liquids compatible with pump component materials.
Performance Chart
GPH of Water at Total Head in Feet
Max**
Model
10'
20'
30'
40'
50'
60'
70'
80'
90'
Head
3161
6720
6420
6000
5460
4740
3700
2500
1200
—
87 ft.
(**) Shut-off; to convert to psi, divide by 2.31.