Specifications Information and Repair Parts Manual
4782-95 & 4786-95
4780-253-00
1
8/2013
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.
©2013 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 ensure proper operation. Unit must be clear of debris and sediment. Inspect for leaks and loose bolts. Failure to do so
voids warranty.
1 1/2-Inch Sprinkler/Booster Pumps
Refer to pump manual 1808-634-00 for General Operating and Safety Instructions.
MAINTENANCE
Make certain that unit is disconnected from power source before
attempting to service or remove any components!
MECHANICAL SEAL REPLACEMENT
Refer to Figures 1, 2 and 3
IMPORTANT:
Always replace both seal seat (Ref. No. 5) and seal head (Ref.
No. 6) to ensure proper mating of components!
1. Unthread bolts (Ref. No. 20) and remove pump casing (Ref. No. 19) and
o-ring (Ref. No. 17) from adapter (Ref. No. 2).
2. Unthread socket cap screws (Ref. No. 15) and remove suction inlet (Ref.
No. 13) and o-ring (Ref. No. 12) from diffuser (Ref. No. 8).
3. Unthread hex nut (Ref. No. 11) from shaft.
NOTE:
Some motors use an open end 7/16” wrench across flats on rear of
motor shaft (remove bearing cap for access) to prevent shaft from turning.
Other motor shafts have a screwdriver slot instead of flats.
4.
Unscrew first stage impeller (Ref. No. 7) from shaft (impeller unscrews
CCW looking at shaft).
NOTE:
A strap wrench is recommended to loosen both impellers. Attempts to
loosen impellers with other tools may cause permanent damage to impellers.
Due to close running fits between parts, damaged impellers should be replaced
before reassembly of pump.
5. Unthread cap screws (Ref. No. 15) and remove diffuser and diffuser/
crossover (Ref. No. 9) from adapter as a unit.
6. Remove shaft sleeve (Ref. No. 10) from shaft and unscrew second stage
impeller (Ref. No. 7).
7. Remove seal head from shaft.
8. Unscrew four bolts (2-Ref. No. 21 and 2-Ref. No. 4) and remove foot (Ref.
No. 22) and adapter from motor mounting face.
9. Push seal seat from adapter recess with a screwdriver.
10. Clean adapter recess before inserting a new seal seat.
11. Carefully wipe polished surface of new seal seat with a clean cloth.
12. Wet the rubber portion of new seal seat with a light coating of soapy
water.
13. 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 pipe. Always use a piece of cardboard between pipe and seal
seat to avoid scratching seal seat (This is a lapped surface and must be
handled very carefully).
14. After seal seat is in place, be sure that it is clean and has not been marred.
15. Using a clean cloth, wipe shaft and make certain that it is perfectly clean.
NOTE:
The stub shaft position is factory set to provide proper seal and
impeller location. Do not loosen the collar (Ref. No. 8) or remove stub shaft
during mechanical seal replacement or entire rotor will need resetting during
reassembly. (See ROTOR ADJUSTMENT on next page.)
16. Carefully guide seal seat over shaft and secure adapter and foot to motor
mounting face.
17. Apply a light coating of soapy water to inside rubber portion of seal head
and slide onto shaft (with polished sealing face first) so that rubber portion
is just over the shoulder at end of threads on shaft.
Do not touch or wipe seal face of seal head.
18. Screw second stage impeller back in place and tighten using a strap
wrench on impeller shroud opening until impeller is against shaft shoulder.
NOTE:
A strap wrench is required to tighten both impellers. Use of any other
kind of tool could permanently damage impeller and cause damage to pump
due to close running fits between impellers, diffuser and suction inlet.
19. Slide shaft sleeve onto shaft.
20. Apply small amount of grease or Vaseline on outside shroud of impeller
opening and shaft sleeve. Remount diffuser and diffuser/crossover. Before
tightening cap screws, rotate shaft and be sure impeller and shaft sleeve
are not rubbing on diffuser or diffuser/crossover.
21.
Screw first stage impeller into place and tighten with a strap wrench.
22. Install hex nut to end of shaft.
23. Remount suction inlet and o-ring, then rotate shaft to be sure impeller is
not rubbing on suction inlet before tightening cap screws.
24. Apply small amount of Vaseline to outside of diffuser at o-ring location and
on flange of suction inlet. Install o-ring and gasket (Ref. No. 16).
IMPORTANT:
Always inspect o-ring and gaskets. When cut, cracked or worn,
replace them. Wet o-rings with Vaseline when reassembling pump for ease of
assembly and to prevent pinching.
25. Remount pump casing.
26. A short “run-in” period may be necessary to provide completely leak-free
seal operation.
DESCRIPTION
These 2-stage sprinkler/booster pumps are equipped with high performance 300 series stainless steel closed impellers, a Buna-N mechanical seal to prevent
leakage and a continuous duty motor. Pumps are designed for higher pressure applications such as: lawn sprinkling, spraying irrigation; also draining and general
dewatering applications. Handles liquids from 40º F to 180º F (4º to 82º C). For use with nonflammable, non-abrasive liquids compatible with pump component
materials.
Содержание 4786-95
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