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Section 

140 • 180

 Page 508

Dated 

October 2011

care to prevent damage.  Should 

prying be necessary, it should be 

done evenly and with great care.

13. On three & four stage pumps, the 

drive collar (#14) must be removed 

before further disassembly can 

continue.  A small screwdriver 

or pocket knife can be useful for 

this task.  Damage to the groove 

should be avoided.

14. Slide the impeller (#11) off the 

shaft.  Penetrating oil should be 

used if resistance occurs.  Prying 

impellers off the shaft almost 

always ruins the impeller.

15. Remove the next channel ring 

(#10) using the same care as with 

the first.

16. Remove the key (#23) from the 

shaft.  Diagonal side cutters or end 

nippers are helpful for this job.

17. For disassembly of single stage 

pumps (141/181 models) proceed 

to step #20.  For all other models 

(142/182, 143/183, & 144/184) 

proceed to next step.

18. Slide off the next channel ring 

(#9).  Along with the ring will come 

an interstage bushing (#16).  Note 

the direction the bushing is facing 

so that the same surfaces will be 

in contact after reassembly.

19. Remove the remaining channel 

rings, impellers and interstage 

bushings.  Stacking the parts 

as they are removed will help in 

maintaining the proper orientation 

and in keeping the impellers with 

the same pair of channel rings.  

On badly corroded pumps it may 

be easier to drive the guide rods 

(#18) back through each ring 

rather than sliding the ring the 

entire length of the rods.  If this is 

to be done, care should be taken 

not to “mushroom” the rod ends 

by tapping with too much force.  A 

soft face hammer and/or brass rod 

is recommended.  Penetrating oil 

helps greatly.

20. Turn the pump around and 

remove the two nuts (#20) holding 

the bearing arm (#3) in place.

21. Removing the bearing arm will 

require the use of a gear puller 

since the bearing (#24) is held in 

the bearing arm by means of a 

snap ring (#4).  Removal of the 

bearing arm will bring the bearing 

along with it.(see figure 4-1)

22. Slide the rubber flinger (#21) off 

the shaft.

23. The remaining internal parts; the 

shaft (#17) and the seal rotating 

assembly (#12) will slide easily out 

of the cover (#1).

24. The shaft extension end seal 

rotating assembly (#12) can be 

removed in the same manner as 

was the outboard rotating element.

25. To complete the disassembly, 

remove the two “O” rings (#8) and 

two guide rods (#18).

26. Press out the shaft extension 

end stationary seat (#12.5) using 

the same procedure as on the 

outboard seat.

27. The remaining seal cup (#2) can 

be removed from the cover by 

driving it outward from the inside.

4D INSPECTION OF 

COMPONENTS

Thoroughly clean all parts.  All 

components should be examined 

for wear and corrosion.  Replace 

parts that show visible wear.  If the 

pump was no longer producing 

sufficient pressure or capacity, it is 

a safe assumption that clearances 

between rings and impeller exceed 

an acceptable amount.  At least 

the impellers should be replaced in 

this case.  If the total side running 

clearance for an impeller exceeds 

.007”, it is unlikely that pump 

performance will reach that of a new 

pump, except at lower discharge 

pressures.

“O” rings and other elastomeric 

components should be replaced if 

they have been deformed or cut.

If seal components must be reused, 

carefully inspect for microscopic 

cracks and nicks.  Scratches that 

might be ignored elsewhere can 

produce leakage if they are on 

seal carbons and seat wearing 

surfaces.  Cleanliness is imperative 

when working with mechanical 

seals.  Almost unnoticeable particles 

between seal faces can be, and often 

are, the cause of early seal failures.

Check to be certain that a press fit 

still exists between the shaft and the 

bearings.  New bearings, or at least 

cleaned and regreased bearings, are 

recommended.

All impellers and interstage bushings 

are designed to float, therefore they 

should move easily on the shaft.  No 

more than .0l0” diametral clearance 

should exist between the shaft and 

the inside of an interstage bushing.  

More than this can produce hydraulic 

unbalance that can quickly wear out 

the impellers.  As long as impellers 

can be moved on the shaft by hand, 

they are loose enough.  If they can 

be rocked or wobbled, they are 

definitely too loose and must be 

replaced.

Check the shaft for galling, pitting, 

and corrosion.  If there are worn 

areas between stages of multistage 

pumps, the shaft should be replaced.  

Pitting or corrosion in the area where 

the seal comes in contact is also 

cause for shaft replacement.  This 

will cause leakage under the seal.  

Surface corrosion must be removed 

so that seals can slide freely during 

assembly.  The shaft diameter 

should be no smaller than .002 inch 

below the nominal fractional seal 

sizes.  Remove any nicks or burrs 

which may have occurred during 

disassembly.  Reclean parts as 

necessary.

4E REASSEMBLY

1. Begin reassembly with the inlet 

cover (#1).  Thread two nuts (#20) 

onto the guide rods (#18), and 

slide them through the two holes 

at six and twelve o’clock.  Push 

them in until the underside of the 

nuts contacts the cover.

2. Slide two “O” rings (#8) over the 

extended ends of the guide rods 

until they touch the cover.

3. It is recommended that the 

assembly be placed on blocks in a 

vertical position as shown.(refer to 

figure 4-3)

4. Place an “O” ring (#7) into the 

groove in the face of the cover 

Содержание 140 SERIES

Страница 1: ...Section 140 180 Page 500 Dated October 2011 97 4670 01 588 140 180 SERIES Pump Manual HORIZONTAL FLEXIBLE COUPLED ...

Страница 2: ...ether loosen each of them exactly three full turns After filling the pump with water again up to 50 foot pounds of torque may be applied to the coupling without fear of ruining the impeller vanes It should begin to turn well before this force is reached Continue turning the pump while the various fasteners are returned to their original positions If the unit still won t turn over DO NOT apply furt...

Страница 3: ...e objectionable harmonics Adequate support for the inlet and discharge piping is important for noise reduction 1D7 Freezing When ambient temperatures drop below the freezing point of the fluid in a pump consideration should be given to heating insulating or draining the pump If you choose to drain the pump and it will only be for a short period first Ps Pvp sp gr remove the drain plugs then drain ...

Страница 4: ... wedges having a small taper Refer to Figure 2 1 a Place shims close to the foundation bolts Refer to Figure 2 2 b Also place shims close to where the greatest weight is located 4 Check the baseplate for distortion a Place a straightedge along the baseplate to determine if it is distorted b Adjust the shims until the baseplate is not distorted 5 Use a section of pipe to determine if the inlet and ...

Страница 5: ...doweled to the baseplate 2E Piping 2E1 Alignment It is important that all piping be lined up and not forced into place It is recommended that you begin piping at the pump If the lines are ended at the pump particularly if the last piece is cut a little too short or long the pump will be forced to meet the pipe and strain or distortion will result 2E2 Piping Support Never allow the pump to support ...

Страница 6: ...ydraulic center Normal operation may be expected 3E Cooling Water When the pump is used to transfer hot fluids consideration should be given to cooling the seals and or selecting materials that will give satisfactory seal life The actual temperature at the seal faces the most critical area will always exceed the surrounding fluid temperature Seal flush taps or lines must be ordered from the factor...

Страница 7: ...Bearing Retaining inlet end only 17 Shaft 5 Stud Bearing Arm 18 Guide Rod 6 O Ring Medium Seal Cup 19 Thru Bolt Casing 7 O Ring Large Casing 20 Nut Casing and Bearing Arm 8 O Ring Small Guide Rod 20 5 Jam Nut Bearing Arm 9 Channel Ring Right outer end ring 21 Flinger 10 Channel Ring Left inlet end ring 22 Drain Plug 11 Impeller Turbine 23 Key Impeller and shaft 12 Seal Rotating Element Unbalanced ...

Страница 8: ...rted 6 Using a soft mallet loosen the outboard cover 1 by tapping lightly around the outside edge Slip the cover off the guide rods 18 being careful not to bend them 7 The seal cup 2 may be removed by tapping it towards the inside of the cover 1 Using a wooden block or dowel for this operation rather than something metal will prevent damage to the seal cup or seal seat 12 5 8 If the seal seat 12 5...

Страница 9: ...NSPECTION OF COMPONENTS Thoroughly clean all parts All components should be examined for wear and corrosion Replace parts that show visible wear If the pump was no longer producing sufficient pressure or capacity it is a safe assumption that clearances between rings and impeller exceed an acceptable amount At least the impellers should be replaced in this case If the total side running clearance f...

Страница 10: ... into place with the water channel facing up refer to figure 4 8 This time however place the large inlet opening in the five o clock position By locating successive stages 180 degrees from the last hydraulic loads are radially balanced 12 Add another Key 23 and an impeller 11 13 Put another O ring 7 into place 14 To complete the second stage assembly install a right hand channel ring 9 facing down...

Страница 11: ...26 Tap a bearing arm 3 over the bearing and retain with two nuts 20 They should be finger tight only 27 Remove the pump from the support blocks and place it on its feet 28 Insert the four thru bolts 19 and install nuts 20 Tighten all six nuts evenly until about one full turn before being fully torqued Return the assembly to the wood blocking with its shaft extension up Install the seal rotating el...

Страница 12: ...e suction lift Relocate pump supply tank or both to minimize suction lift 5 Wrong direction of rotation Compare pump rotation with arrow on pump Standard pumps rotate in a clockwise direction when looking at the shaft extension end or from the motor end on close coupled pumps Reverse two leads on a three phase motor to change rotation Check motor nameplate for single phase operation 6 Clogged suct...

Страница 13: ...nsumption 6 Pump not properly adjusted Loosen all nuts on pump exactly one turn Follow the instructions in Section 5F Testing and Final Adjustments for repositioning fasteners 5F Pump Vibrates Or Is Noisy 1 Pump and motor are misaligned Follow the instructions in Section 2D Alignment for proper alignment 2 Insecure mounting Follow instructions in Section 2 2B Foundation 3 Piping load on pump Insta...

Страница 14: ...ow pages or by contacting MTH Pumps at 401 W Main St Plano IL 60545 Phone 630 552 4115 Fax 630 552 3688 6B Repair Services Repair service for an MTH pump should be obtained from the company through which it was purchased In the event this is not possible the name and phone number of a nearby MTH representative or distributor may be obtained by contacting MTH Pumps In the event that it is necessary...

Страница 15: ...arked with the Return Goods Authorization RGA number provided by MTH and shipped freight prepaid and allowed F O B the MTH factory at Plano Illinois USA MTH may in its sole discretion deny any warranty claim if shipping damage any attempted disassembly or any other action outside of MTH s control impairs MTH s determination of the existence of or cause of a claimed failure Notwithstanding anything...

Страница 16: ...Section 140 180 Page 515 Dated October 2011 97 4670 01 588 ...

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