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Dover PSG BLACKMER MLN4B, Инструкции по установке, эксплуатации и обслуживанию, Страница: 10 / 20

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106-A00    Page 10/20 

MAINTENANCE: M(R)LX(W)4B Series

 

 

8. MECHANICAL 

SEAL 

Rotating Assembly 

a.  Make sure the shaft is free of burrs that might cut or 

nick the O-rings. Put a light film of grease on the 
shaft between the rotor and the shaft threads to 
facilitate seal installation. 

b.  Slide the mechanical seal rotating assembly (153B & 

153E) over the shaft with the drive tangs of the 
jacket towards the rotor, and the polished face 
outward. 

c. 

Rotate the jacket assembly to engage the drive 
tangs into the rotor slots. 

IMPORTANT: 

Failure to 

engage the drive tangs of the jacket assembly will 
cause seal damage when the hub is attached. 

d.  Clean the rotating seal face with a clean tissue and 

alcohol. 

Stationary Seat 

a.  Put a light coating of grease in the seal recess of the 

hub. 

b.  Align the locating pin in the stationary seat (153A) 

with the slot in the bottom of the hub recess. 

c. 

Insert the stationary seat (153A) and O-ring (153D) 
into the seal recess with the polished face outward. 

d.  Clean the polished face with a clean tissue and 

alcohol.  Bronze seal faces should be oiled during 
installation, but other seal faces must be kept clean 
and dry.  Note: Carbon/PTFE rotating seal face 
(153B) is installed as a one-piece assembly. 

9. HUB 

ASSEMBLY 

a.  Before installing the second hub assembly, grease 

the three (3) head chamfers. 

b.  Install the hub O-rings (72A & 72B), and slide the 

hub onto the shaft with the V-notch of the hub 
towards the bottom of the pump. Use extreme care 
to avoid damage to the seal face. 

c. 

Install and hand tighten the two hub capscrews 
(21D) to pull the hub into place. 

10.  BEARING AND BEARING SPACER 

a.  Hand pack the bearing (24) with grease. See 

LUBRICATION section of this manual. 

b.  Insert the greased bearing (24) into the bearing 

housing of the hub. Tap the outer edge of the 
bearing to ensure that it is properly seated. 

c. 

Slide the bearing spacer (24D) onto the shaft. 

11. 

Return to the first

 head assembly and remove and 

reassemble the hub, 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 
cause bearing failure or a broken lockwasher tang.  Loose 
locknuts will allow (See Figure 8) the rotor to shift against the 
heads, causing wear.  

a.  On both ends of the pump shaft, Install a lockwasher 

(24B) with the tangs facing outward, followed by a 
locknut (24A) with the tapered end inward. Ensure the 
inner tang "A" of the lockwasher is located in the slot 
in the shaft threads, bending it slightly, if necessary. 

b.  Tap outer edge of bearings (24) with soft mallet to 

ensure they are bottomed in the head recess.  Tighten 
both locknuts (24A).  DO NOT overtighten and bend or 
shear the lockwasher inner tang. 

c.  Loosen both locknuts (24A) one complete turn. 

d.  Tighten one locknut (24A) until a slight rotor drag is felt 

when turning the shaft by hand. 

e.  Back off the nut the width of one lockwasher tang "B". 

Secure the nut by bending the closest aligned 
lockwasher tang into the slot in the locknut. The pump 
must turn freely when rotated by hand. 

f.  Tighten the opposite locknut (24A) by hand until it is 

snug against the bearing (24). Then, using a spanner 
wrench, tighten the nut the width of one lockwasher 
tang. Tighten just past the desired tang, then back off 
the nut to align the tang with the locknut slot. Secure 
the nut by bending the aligned lockwasher tang into 
the slot in the locknut. The pump must continue to turn 
freely when rotated by hand. 

g.  To check adjustment, grasp the nut and washer with 

fingers and rotate back and forth. If this cannot be 
done, one or both locknuts are too tight. Alternately 
loosen one stop at a time .001" (.025mm) until 
properly adjusted.  Begin by loosening the locknut 
adjusted last. 

h.  After adjustment is complete, remove the bearing 

cover capscrews and 3/8" washers from both ends of 
the pump. 

 

Figure 8   Locknut Adjustment 

 

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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