AMT 3899-98, Спецификация, информация и руководство по ремонту запасных частей

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Specifications Information and Repair Parts Manual
3899-97 & 3899-99
3890-252-00 2 2/2015
MAINTENANCE
Make certain that the unit is disconnected and locked out from
the power source before attempting to service or remove any
components. If power disconnect is out-of-sight, lock it in open
position and tag to prevent application of power.
MECHANICAL SEAL REPLACEMENT
Refer to Figures 2, 3 and 4.
IMPORTANT:
Always replace both seal seat (Ref. No. 8) and seal head
(Ref. No. 9) to insure proper mating of components! It is recommended
that impeller seal (Ref. No. 4) also be replaced when replacing shaft
seal.
1.
Unthread fasteners (Ref. No. 13) and remove casing (Ref. No. 2)
and casing seal (Ref. No. 10).
2. Unscrew impeller fastener (Ref. No. 3) from shaft (fastener
unscrews CCW looking at shaft).
3. Unscrew impeller (Ref. No. 5) from shaft. Remove impeller seal.
Also, remove shims (Ref. No. 6) DO NOT LOSE SHIMS.
4. Pry seal seat from recess of impeller. Use caution so as not
to damage or remove seal seat pin (Ref. No. 7) on Teflon seal
equipped units.
5. Remove the adapter and casing cover (Ref. Nos. 12 and 11) by
unthreading fasteners (Ref. Nos. 21 and 23).
6. Press seal head from rear of casing cover.
7. Clean casing cover and impeller seal recesses and 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.
8. Apply a light coat of sealing compound to new seal head (See
Figure 2) and press it into casing cover recess using proper size
tube or installation tool (See Figure 2). DO NOT press on carbon
face or top of metal cup of the seal head. Install using flange only.
9. Slide adapter and casing cover assembly onto mounting face.
Attach with fasteners .
10. Press new seal seat squarely into impeller recess. Align slot
in seal seat with seal seat pin on Teflon equipped units. Avoid
scratching polished surface.
NOTE:
Use a soft, clean piece of cloth on seal seat face when installing
to prevent marring.
11. Replace any shim washers which may have been removed in
disassembly (see SHIM ADJUSTMENT). Screw the impeller back
in place, tightening until it is firmly seated.
12. Install impeller seal and install and tighten impeller lock nut.
13. Reinstall seal on casing cover rabbet. Remount casing with
fasteners.
NOTE:
Always flush 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. Also replace impeller
washer.
SHIM ADJUSTMENT
When installing a replacement impeller (Ref. No. 5), casing (Ref. No.
2), casing cover (Ref. No. 11), adapter (Ref. No. 12), pedestal (Ref.
No. 24), stub shaft (Ref. No. 18) or shaft (Ref. No. 26), it may be
necessary to adjust number of shims (Ref. No. 6) to ensure proper
running clearance between impeller and casing. Proceed as follows:
NOTE: A proper running clearance is less than 0.010”. (Face of
impeller to mating face of casing.)
1.
Add two (0.010”) shims in addition to those removed originally.
2. Reassemble pump as described in Steps 11, 12, and 13.
IMPORTANT: 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 casing cover and casing are fitted “metal to metal” where they
meet on outside. If they are not “metal to metal”, tighten fasteners
(Ref. No. 13) and recheck shaft for free turning. Tighten carefully,
turning shaft while tightening so that bearings are not damaged in
the event that too many shims were installed. If shaft seizes before
fasteners are completely tight, disassemble pump and remove one
(0.010”) shim and repeat reassembly.
Figure 2 - Seal Installation Tool
Figure 3 - Mechanical Seal Replacement
1½ -Inch Self-Priming Centrifugal Pedestal Pumps