Specications Information and Repair Parts Manual GCW Series
GCWX-250-00 1 4/2021
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 specications at any time without incurring any obligation.
©2021 AMT Pump Company, A Subsidiary of The Gorman-Rupp Company, All Rights Reserved.
Periodic maintenance and inspection is required on all pumps to ensure proper operation. Unit must be clear of debris and sediment. Inspect for leaks and loose bolts. Failure to do so
voids warranty.
Aluminum General Purpose Pumps
Refer to pump manual 1808-633-00 for General Operating and Safety Instructions.
MAINTENANCE
To prevent accidental starting, always remove spark plug or disconnect
and ground spark plug wire before attempting to service or remove any
component.
MECHANICAL SEAL REPLACEMENT
Refer to gures 1, 2 and 3.
IMPORTANT: Always replace both seal seat and seal head (Ref. No. 9) to
ensure proper mating of components!
1. Unthread fasteners (Ref. No. 15) and remove casing (Ref. No. 13) and
casing seal (Ref. No. 11).
2. Remove volute (Ref. No. 10).
3. Unscrew impeller fastener (Ref. No. 8) from motor shaft (fastener
unscrews CCW looking at motor shaft).
NOTE: To prevent shaft from turning, remove shroud from engine and hold the
ywheel in place.
4. Remove keyed impeller (Ref. No. 7) from motor shaft. Remove shims
(Ref. No. 6) DO NOT LOSE SHIMS.
5. Pry seal seat from recess of impeller.
6. Remove the adapter (Ref. No. 2) by unthreading fasteners (Ref. No. 4).
7. Press seal head from rear of adapter.
8. Clean adapter and impeller seal recesses and motor shaft. Make certain
all surfaces are perfectly clean before installing new seal parts.
Handle seal parts with extreme caution and keep them clean. Do not
touch polished seal faces with your hands. Do not apply lubricants on
seal faces. This could cause a leak or premature seal failure.
9. Apply a light coat of sealing compound to new seal head (See Figure 1)
and press it into adapter recess using proper size tube or installation tool
(see Figure 2). DO NOT press on carbon face. Install using ange only.
10. Slide adapter onto motor mounting face. Attach with fasteners.
11. Press new seal seat squarely into impeller recess. Avoid scratching
polished surface.
NOTE: Use a soft, clean piece of cloth on seal seat face when installing to
prevent marring.
12. Replace any shim washers which may have been removed in disassembly
(see SHIM ADJUSTMENT). Using key, put the impeller back in place.
13. Install and tighten impeller screw.
14. Reinstall volute and remount casing with fasteners.
NOTE: Volute gets placed inside casing before mounitng casing to adapter.
NOTE: Always ush pump thoroughly before use so as not to contaminate
liquid being pumped. If impeller is replaced, seal assembly should also be
replaced as seal is usually damaged in disassembly.
SHIM ADJUSTMENT
When installing a replacement impeller, it may be necessary to vary number of
shims that will be required. This is done by adding 0.010” shim more than was
removed and reassembling pump as follows:
IMPORTANT: When clearance between impeller and volute exceeds 1/16” at
face of impeller or 1/8” on outside diameter of impeller, it may be necessary to
take corrective action.
1. Ensure that casing is snugly in place and check shaft to make sure it is
turning freely. If it turns freely, check to ensure that adapter and casing
are seated rmly, compressing gasket where they meet. If they are not
seated, tighten fasteners and recheck shaft for free turning. Tighten
carefully, turning shaft while tightening. If shaft seizes before fasteners
are completely tight, disassembly pump, remove one shim and repeat
reassembly.
2. If at any time during shim adjustment shaft does not turn free, or a metal-
to-metal rubbing can be heard or felt when turning shaft, repeat SHIM
ADJUSTMENT procedure.
NOTE: Impeller must be as close as possible to volute in order to perform
properly and retain suction capabilities.
DESCRIPTION
These pumps are engine driven, self-priming (to 20 ft. lift), portable units. Clog resistant impeller is capable of handling solids up to 1/4” diameter (2”=3/16” &
3”=1/4”). For use with non-ammable, non-abrasive liquids compatible with pump component materials.
Figure 1 - Mechanical Seal Replacement
Figure 2 - Seal Installation Tool (Ref. No. 31)
