Product Manual

Specifications Information and Repair Parts Manual 3GS5QCV & 3GS8ACV
3GSX-250-00
1
03/2012
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.
©2012 American Machine & Tool Co., Inc. of PA, 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.
3-Inch IPT Solids-Handling Pumps
Refer to pump manual 1808-633-00 for General Operating and Safety Instructions.
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 40º to 180º (4º to 82º C). For use with nonflammable, non-abrasive liquids compatible with pump
component materials. Pumps are constructed of cast iron with either Buna N or Viton mechanical seal components (see specifications). Viton is
recommended for pumping alachlor herbicides (e.g. Monsanto Lasso®) or other compatible liquids.
MAINTENANCE
Always disconnect battery cables and spark plug wire from spark
plug before performing any maintenance operation requiring
disassembly of the pump.
MECHANICAL SEAL REPLACMENT
Refer to figures 1 and 2.
NOTE: Always replace seal assembly (Ref. No. 7) and shaft sleeve
(Ref. No. 8) to ensure proper mating of mechanical seal components
(models 327A and 327B have no shaft sleeve).
1. Remove pump casing (Ref. No. 3), gasket (Ref. No. 9) and
impeller (Ref. No. 5).
2. Remove the shaft sleeve with the seal head on it.
3. Remove seal head from rear of impeller.
4. Remove the adapter (Ref. No. 10) and push seal seat from
adapter recess with a screwdriver.
5. Thoroughly clean all surfaces of the adapter recess.
6. Using a clean cloth, wipe the polished surface of the seal
head.
7. 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 extreme 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.
8. Inspect the ceramic face of the seal seat and carbon face of
the seal head to ensure they are clean and not marred.
9. Wet the inside rubber portion of the 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.
IMPORTANT: Before installing new shaft sleeve, apply a bead of non-
hardening, pliable sealant (such as Permatex® Form-A-Gasket® No.
2) to motor shaft shoulder.
10. 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.
11. Screw impeller back in place, tightening until it is against the
end of the engine shaft.
12. Replace adapter gasket and casing and fasten with eight
cap screws.
13. 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.
14. A short "run-in" period may be necessary to provide
completely leak-free seal operation.
IMPELLER REPLACEMENT
Impeller (Ref. No. 5) is 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 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 lengthened priming times and reduced pumping 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 clearances on your unit may have
developed, since the increased clearances in themselves 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.
Figure 1 – Mechanical Seal