Specifications Information and Repair Parts Manual
422 Series
4222-250-00
1
9/2016
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.
©2016 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.
2 Inch Dewatering 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 figures 1A, 1B and 2.
IMPORTANT:
Always replace seal assembly (Ref. no. 14) and shaft sleeve
(Ref. no. 13) to ensure proper mating of mechanical seal components.
1. Unthread fasteners and remove casing from adapter.
NOTE:
Inspect gasket. Replace if torn or damaged.
2. Unscrew impeller from engine shaft and remove impeller shims. Keep
shims for assembly.
NOTE:
To keep shaft from turning, remove shroud from engine and hold
flywheel in place. Engine has a threaded shaft. To remove impeller, turn
impeller CCW (facing engine shaft).
3. Slide shaft sleeve and seal head (the part with spring) from engine shaft.
4. Unthread fasteners and remove adapter from engine mounting face.
5. Push seal seat from adapter recess with a screwdriver.
6. Clean adapter recess before inserting a new seal seat.
NOTE:
The precision lapped faces on mechanical seal are easily damaged.
Handle your replacement seal carefully.
7. Carefully wipe polished surface of new seal seat with a clean cloth.
8. Wet rubber portion of seal seat with a light coating of soapy water. Press
new seal seat squarely into cavity in adapter. If seal seat does not press
squarely into cavity, it can be adjusted in place by pushing on it with a
piece of cardboard between pipe and seal seat. Avoid scratching seal
seat. (This is a lapped surface and must be handled very carefully).
9. Press new seal seat squarely into cavity in adapter. If seal seat does not
press squarely into cavity, it can be adjusted in place by pushing on it with
a piece of cardboard between pipe and seal seat. Avoid scratching seal
seat. (This is a lapped surface and must be handled very carefully).
NOTE:
Do not install a scratched, cracked or damaged seal seat; it will leak.
10. After seal seat is in place, ensure that it is clean and has not been marred.
11. Using a clean cloth, wipe shaft and make certain that it is perfectly clean.
12. Secure adapter on engine mounting face.
Tighten fasteners EVENLY to avoid cocking adapter on rabbet on engine
mounting face.
13. Apply a light coating of soapy water to inside rubber portion of seal head
and slide onto shaft sleeve. Slip shaft sleeve with seal cartridge onto
engine shaft.
Do not touch or wipe polished part of seal cartridge.
14. Replace impeller shims.
NOTE:
See shim adjustment below
15. Screw impeller back in place, tightening until it is against shaft shoulder.
16. Remount pump casing on adapter.
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 casing 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 firmly, 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 casing in order to perform
properly and retain suction capabilities.
DESCRIPTION
These dewatering pumps are engine driven, self-priming (to 20 ft. lift), portable units. Clog resistant impeller is capable of handling solids up to 3/8” diameter. For
use with non-flammable, non-abrasive liquids compatible with pump component materials.
Figure 1A - Mechanical Seal Replacement
Figure 1B - Mechanical Seal Replacement
Summary of Contents for 4222-95
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