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Dover PSG BLACKMER MLN4B, Инструкции по установке, эксплуатации и обслуживанию, Страница: 13 / 20

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106-A00    Page 13/20 

MAINTENANCE: MLN4B, MRLN4B

 

 

PUMP DISASSEMBLY 

NOTICE: 

Follow all hazard warnings and instructions provided in 
the “Maintenance” section of this manual. 

NOTE: 

The numbers in parentheses following individual 

parts indicate reference numbers on the Pump Parts List. 

1.  On the outboard (non-driven) side of the pump, remove 

the hub capscrews (21D). To disengage the outboard 
hub assembly (20C) from the head, two jackscrew holes 
are provided in the rim of the hub. Slide the hub 
assembly off the shaft with the shaft cover still intact. 

NOTE: 

The sleeve bearing (24) is press fitted into the 

hub.  Do not remove unless replacement is necessary 
(see "Sleeve Bearings"). 

2.  Remove the two shaft cover capscrews (28) to release 

the shaft cover (27) and O-ring (26) from the hub 
assembly. 

3.  On the opposite (inboard) end of the pump, clean the 

pump shaft thoroughly, making sure the shaft is free of 
nicks, burrs, or paint that might damage the packing or 
mechanical seal when the inboard hub is removed. 

4. 

PUMPS EQUIPPED WITH PACKING

 

a.  Back off the packing removal nuts (18A) to reduce 

packing friction. 

b.  Remove the inboard hub capscrews (21D). Two 

jackscrew holes are provided in the rim of the 
inboard hub to facilitate removal. 

c. 

Slide the packing follower (75) and hub assembly 
(20C) together off the shaft. 

d.  Remove the packing follower (75) removal nuts 

(18) and pull the follower out of the hub assembly. 

e.  The packing rings (19) and packing washer (58) 

can be pulled from the inboard hub with the use of 
a corkscrew tool or screwdriver. 

NOTE: 

On pumps equipped with 

Blackmer Triple-Lip Seal 

or a commercial mechanical seal, 

loosen all setscrews 

before removing the hub assembly. For further instructions 
on the disassembly and assembly of commercial mechanical 
seals, refer to the separate literature accompanying the 
mechanical seal. 

5.  Remove the head capscrews (21) and head stud nuts 

(21C). Two jackscrew holes are provided in the rim of 
the head to facilitate removal. 

6.  Remove the head (20 or 20A) from the casing (12), 

being careful not to nick or scrape the shaft. 

7.  The disc (71) will come off with the head assembly and 

is attached with four countersunk, allen-head machine 
screws (71A) and lockwashers (71B). 

8.  From the open side of the pump, grasp the rotor in the 3 

and 9 o'clock positions, and gently pull the rotor and 
shaft (13) out of the head assembly remaining on the 
casing. 

CAUTION: 

Use care to avoid injury-the rotor 

and shaft is heavy and may have sharp edges. 

9.  The remaining head assembly can now be easily 

removed.  Follow Steps 6 through 8. 

 

10.  Depending on the pump application, the liner (41) can be 

removed in two ways: 

a.  If the pumpage is a clean, non-corrosive liquid, with 

low viscosity, the liner can usually be withdrawn from 
the casing by prying with two bars. Insert the tips of 
the bars into the port openings on either side of the 
liner, and partially remove the liner by prying against 
the rotor. Use a block under the bar, against the rotor, 
to bring the liner the rest of the way out (see Figure 
9). 

 

 

Figure 9 – Liner Removal 

b.  If the pumpage is corrosive, contains a large 

concentration of particulate matter, or is high 
viscosity, the liner will most likely have to be driven 
out of the casing, rather than pried out. To do so, use 
a brass or hard wood drift and a hammer and tap 
around the diameter of the liner until it is driven out of 
the casing. 

 
 

PARTS REPLACEMENT 

1.  If any of the O-rings have been removed or disturbed 

during disassembly, they must be replaced with new O-
rings. 

NOTE: 

Heat PTFE O-rings in hot water to aid 

installation. 

2.  Excessive or continuous leakage around the pump shaft 

may be an indication of a damaged mechanical seal, worn 
packing, or a damaged or worn sleeve bearing. 

a.  If a mechanical seal has been leaking, it is 

recommended the entire seal be replaced. Refer to 
"General Pump Troubleshooting" for possible causes 
of seal leakage. 

b.  If the packing is leaking excessively, refer to "Packing 

Adjustment." If this does not solve the problem, install 
a complete new set of packing rings. 

c. 

If the pump shaft indicates an excessive amount of 
radial "play," replace the sleeve bearing (24) in the 
hub (20C). 

 

Содержание PSG BLACKMER MLN4B

Страница 1: ...mer com or by contacting Blackmer Customer Service SAFETY DATA This is a SAFETY ALERT SYMBOL When you see this symbol on the product or in the manual look for one of the following signal words and be alert to the potential for personal injury death or major property damage Warns of hazards that WILL cause serious personal injury death or major property damage Warns of hazards that CAN cause seriou...

Страница 2: ...DENTIFICATION A pump identification tag containing the pump serial number I D number and model designation is attached to each pump Record and file the data from this tag for future reference If replacement parts are needed or if information pertaining to the pump is required this data must be furnished to a Blackmer representative MLX4B Full size liner External Ball Bearings MLXW4B MLX4B w Wear r...

Страница 3: ...ea of at least four times the area of the intake piping Strainers must be cleaned regularly to avoid pump starvation 4 The intake system must be free of air leaks 5 Expansion joints placed at least 36 0 9m from the pump will compensate for expansion and contraction of the pipes Contact the flexible connector hose manufacturer for required maintenance care and design assistance in their use 6 Insta...

Страница 4: ...ation and create undue stress on all attached components Never start a pump when it is rotating in the reverse rotation as the added starting torque can damage the pump and related equipment OPTIONAL JACKETED HEADS Hot oil or steam can be circulated through jacketed heads by connections at the NPT pipe plugs directly above and below the shaft for heating highly viscous liquids or to thaw out liqui...

Страница 5: ...ns provided These can be used to check actual suction and discharge conditions after pump start up 6 Check the wiring of the motor and briefly turn on the power to make sure that the pump rotates in the direction of the rotation arrow START UP PROCEDURES NOTICE Consult the General Pump Troubleshooting section of this manual if difficulties during start up are experienced 1 Start the motor Priming ...

Страница 6: ... the pump or pumping system from excessive pressure The valve is not meant to be used for prolonged recirculation When pumping highly volatile liquids under a high suction lift and cavitation or starving of the pump exists partial closing of the discharge valve will result in excessive noise in the relief valve Plumbing the relief valve so flow is directed back to the storage tank is recommended w...

Страница 7: ...ANCE STRAINERS Strainers must be cleaned regularly to avoid pump starvation Schedule will depend upon the application and conditions LUBRICATION NOTICE To avoid possible entanglement in moving parts do not lubricate pump bearings gear reducer or any other parts while the pump is running NOTICE If pumps are repainted in the field ensure that the grease relief fittings 76A are functioning properly a...

Страница 8: ...use of wire hooks carefully pull the rotating seal assembly jacket seal face O ring 153B 153E out of the head and off the shaft Holes in the seal jacket will facilitate the removal 7 Remove the head capscrews 21 and head stud nuts 21C Two jackscrew holes are provided in the rim of the head to facilitate removal 8 Remove the head 20 or 20A from the casing 12 being careful not to nick or scrape the ...

Страница 9: ...ten the head capscrews 21 uniformly making sure the head O ring 72 slides into place without damage 4 Attach one hub 20C and bearing 24 to the mounted head without O rings or mechanical seal components Install and snug up the hub capscrews 21D NOTE This step is intended as an assembly aid and is essential to help guide the rotor and shaft into place without damaging the mechanical seal The remaini...

Страница 10: ...this time including the mechanical seal and O rings see Step 8 for mechanical seal instructions Lightly grease the shaft and the head chamfers before installing the assembly to enable the O rings to slide into place without damage Reinstall the bearing spacer 24D 12 LOCKNUT INSTALLATION The bearing locknuts 24A and lockwashers 24B MUST be installed and adjusted properly Overtightening locknuts can...

Страница 11: ...t protector 185 into the bearing cover 27 on the non driven end of the pump 16 RELIEF VALVE ASSEMBLY if equipped a Insert the valve 9 into the relief valve body 6 with the fluted end inward b Install the relief valve spring 8 spring guide 7 and guide rod 45 against the valve c Attach a new relief valve gasket 10 and the valve cover 4 on the cylinder d Screw the relief valve adjusting screw 2 into ...

Страница 12: ... the appropriate procedures and warnings as presented in this manual SCHEDULED MAINTENANCE STRAINERS Strainers must be cleaned regularly to avoid pump starvation Schedule will depend upon the application and conditions LUBRICATION NOTICE To avoid possible entanglement in moving parts do not lubricate gear reducer or any other parts while the pump is running Sleeve bearings bushings are lubricated ...

Страница 13: ...e the head 20 or 20A from the casing 12 being careful not to nick or scrape the shaft 7 The disc 71 will come off with the head assembly and is attached with four countersunk allen head machine screws 71A and lockwashers 71B 8 From the open side of the pump grasp the rotor in the 3 and 9 o clock positions and gently pull the rotor and shaft 13 out of the head assembly remaining on the casing CAUTI...

Страница 14: ...o nuts 21C on the head studs f Install and tighten the head capscrews 21 uniformly making sure the head O ring 72 slides into place without damage 4 SLEEVE BEARINGS Bushings If the sleeve bearing 24 has been removed from the hub 20C a new bearing must be installed prior to attaching the hub assembly to the head a To aid installation heat the hub in an oven at 200 F 93 C before installing the beari...

Страница 15: ...n after 20 30 minutes of running the pump and readjust if necessary NOTE Some leakage is desirable to lubricate the packing but in some cases is unacceptable depending on the application 10 BLACKMER TRIPLE LIP SEAL if equipped On pumps equipped with a Blackmer triple lip seal refer to the separate literature accompanying the triple lip seal for installation instructions 11 COMMERCIAL MECHANICAL SE...

Страница 16: ...he discs with a clean cloth and alcohol to remove any dirt or foreign particles MLX Models Improper locknut adjustment Locknuts must be adjusted properly to center the rotor and shaft between the heads Refer to Locknut Installation on Page 10 MLN Models Excessively tight packing Refer to Packing Adjustment on Page 15 MLX MLN Models Contaminated mechanical seal faces Any trace of grease or dirt on ...

Страница 17: ...r specific application Continual or long term bypassing of liquid through relief valve Check for restriction in the discharge line or an improper relief valve adjustment See Relief Valve on Page 6 OTHER POSSIBLE CAUSES OF NOISE AND VIBRATION Excessively worn vanes liner or discs Bearing Worn or Damaged Loose or improperly installed piping Misalignment of pump and driver Pump base not properly moun...

Страница 18: ...r pressure spikes Pump driver driveline drive shaft misalignment Excessively worn vanes or vane slots Settled or solidified material in the pump at start up Overtightened V belts if used SEAL LEAKAGE Probable Cause O rings not compatible with the liquids pumped O rings nicked cut or twisted Shaft at seal area damaged worn or dirty Ball bearings overgreased Pump sleeve bearings worn excessively Exc...

Страница 19: ...106 A00 Page 19 20 NOTES ...

Страница 20: ... 215 GPM HXL 6 8 10 Sliding Vane Pumps 130 to 2 220 GPM Refineries Terminals Barges Ships Reciprocating Gas Compressors Liquefied Gas Transfer Boosting Vapor Recovery Hand Operated Pumps Dispensing Transfer In line Accessories Gear Reducers Bypass Valves Strainers Visit www blackmer com for complete information on all Blackmer products 1809 Century Avenue Grand Rapids Michigan 49503 1530 U S A Tel...

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