owner’s manual operating instructions - nve sales repnational vacuum equipment, inc. was founded...

Owner’s Manual&

Operating InstructionsNVE Blowers Models 747, 957 & 1457

2670 Aero Park DriveTraverse City, MI 49686 USA

231.941.0215 Phone231.941.2354 Fax

[email protected] | www.natvac.com | 800.253.5500

National Vacuum Equipment, Inc.


NVE Blowers | 1www.natvac.com | 800.253.5500

NVE Blowers

Owner’s Record

Date of Purchase: __________________________________

Purchased from: __________________________________

Serial Number: ____________________________________


2 | NVE Blowers www.natvac.com | 800.253.5500

© 2002 National Vacuum Equipment, Inc.

07/10 Rev. B

No part of this manual may be reproduced without the written permission of National Vacuum Equipment, Inc.


Contents IntroductionAbout National Vacuum Equipment, Inc. . . . . . . . . . . . . . . . . . . . . . 5

Limited WarrantyWarranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7Warranty Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

NVE BlowersApplication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9Pump Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13Silencers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13System Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14Ballast Air Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15Four Way Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15Pressure Relief Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15Vacuum Relief Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16Check Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16Primary Shutoff . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16Secondary Shutoff . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16Bag House . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18Drive system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18

Operating InstructionsNormal Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20Recommended Lubricant . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22


Contents Continued Pump Rebuilding

Special Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23Pump Rebuild . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Parts List(747 Blower is out of production)747 Manifold Diagram . . . . . . . . . . . . . . . . . . . . .45747 Blower Parts List . . . . . . . . . . . . . . . . . . . . . .46747 Blower Parts Diagram . . . . . . . . . . . . . . . . . . 47957 Manifold Diagram . . . . . . . . . . . . . . . . . . . . .49957 Blower Parts Diagram . . . . . . . . . . . . . . . . .50957 Blower Parts List . . . . . . . . . . . . . . . . . . . . . . 511457 Manifold Diagram . . . . . . . . . . . . . . . . . . . .531457 Blower Parts Diagram . . . . . . . . . . . . . . . .541457 Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . .55


Introduction

General Information

About National Vacuum Equipment, Inc.

Congratulations! You now own a quality vacuum/pressure blower proudly manufactured in the U.S.A. by National Vacuum Equipment, Inc. You have not only acquired a superior piece of equipment from a qualified dealer, you have hired a team of vacuum experts. We stand ready to work with your dealer to answer your questions and provide you with the information necessary to keep your equipment in peak working condition.

Thank you for using National Vacuum Equipment.

OUR MISSION:

We are dedicated to the manufacture and wholesale distribution of quality vacuum system products at a reasonable price, on a timely basis. We are a “one-stop shop” for manufacturers and distributors of vacuum equipment.


OUR HISTORY:

National Vacuum Equipment, Inc. was founded in 1980 by Bruce Luoma. The Company started as a retailer of vacuum pumps. Soon after it started, the Company secured the rights to exclusive distribution of the Battioni vacuum pumps in North America. This helped the Company to evolve into its current status as a wholesale supplier.

To reach the goal of becoming a full service supplier of vacuum system components, the Company began fabricating its own line of componentry, purchased and developed its own line of vacuum pumps, and began purchasing for resale various valves and accessories.

Today, NVE has full service machine and fabrication shops complete with CNC-controlled production equipment designed for close tolerance work. The company has a highly trained staff all of whom are dedicated to quality.


Limited Warranty

NVE Blowers


Guarantees that the product it provides is free of

manufacturer’s defects, including materials and

workmanship. Properly installed and maintained product

is warranted for a period of one (1) year subject to the

following conditions:

1. A properly completed warranty registration card must be received by us within 30 days of sale to end user for pump sales to be considered warrantable. All pumps received for warranty consideration must retain the original NVE serial number tag.

2. The one (1) year period shall begin the day the product is shipped from our warehouse, unless we are provided with an authentic copy of the original resale invoice, in which case the one (1) year period shall begin at such invoice date.

3. The covered product must be used in an application for which it was intended. We do not recommend our product for particular uses or applications.

NVE 957 BlowerShaft Low


4. Damage caused by improper use or lack of proper maintenance is not warrantable.

5. Manufacturer’s liability under this or any other warranty, whether express or implied, is limited to repair of or, at the manufacturers option, replacement of parts which are shown to have been defective when shipped.

6. Manufacturer’s liability shall not be enforceable for any product until National Vacuum Equipment, Inc. has been paid in full for such product.

7. Except to the extent expressly stated herein, manufacturer’s liability for incidental and consequential damage is hereby excluded to the full extent permitted by law.

8. Manufacturer’s liability as stated herein cannot be altered except in writing signed by an officer of National Vacuum Equipment, Inc.

9. Certain products provided by National Vacuum Equipment, Inc. are covered by their respective manufacturer’s warranties (e.g., engines used in the NVE engine drive packages). These products are not covered by the National Vacuum Equipment, Inc. Manufacturer’s Warranty.


Should a potential warranty situation arise, the following procedures must be followed:

• Contact your dealer immediately upon the occurrence of the event and within the warranty period.

• Customer must receive a return goods authorization (RGA) before returning product.

• All serial-numbered products must retain the NVE serial number tag to be qualified for warranty.

• Product must be returned to NVE intact for inspection before warranty will be honored.

• Product must be returned to NVE freight prepaid in the most economical way.

• Credit will be issued for material found to be defective upon our inspection, based upon prices at the time of purchase.

NVE Blowers

• The NVE BLOWERS are severe duty vacuum pumps, designed to be used in liquid waste pumping systems where extended operation is desired.

• The pumps incorporates a ballast air cooling system to provide superior cooling allowing for extended operation.


NVE 747 Blower Specifications

Model Number 747RPM Range 3000-4200Maximum Air Flow-CFM 6477Maximum Continuous Vacuum 27” HGMaximum Continuous Pressure 10 P.S.IPump Drive Rotation CW/CCWShaft Location HI/LOPorting Size 4”Net Weight 335 lbs.

Optional Manifold Includes4 Way Vacuum/Pressure valve StandardIntake Filter StandardBallast Air Filter StandardBallast Air Silencer StandardExhaust Silencer StandardBallast & Exhaust Check Valve StandardPressure Relief Valve StandardTemperature Gauge Standard

OPERATING SPECS

FREE FLOW VACUUM (INCHES OF MERCURY)

RPM UOM 0 9 18 21 24 27

3000HP 17.6 20.4 25.9 30.7 33.8

CFM 462 353 324 306 188

3600HP 20.4 22.1 26.5 30.8 35.3 39.3

CFM 555 424 389 367 297 77

4200HP 23.5 25.4 30.5 35.4 40.6 45.2

CFM 647 494 454 428 346 106

Recommended Setupfor optimum performance

NVE 747 Flow Data

Pump Specifications



Model Number 957 RPM Range 2100-3600Maximum Air Flow-CFM 1007Maximum Continuous Vacuum 27” HGMaximum Continuous Pressure 10 P.S.IPump Drive Rotation CW/CCWShaft Location HI/LOPorting Size 5”Net Weight 560 lbs

Optional Manifold Includes4 Way Vacuum/Pressure valve StandardIntake Filter StandardBallast Air Filter StandardBallast Air Silencer StandardExhaust Silencer StandardBallast & Exhaust Check Valve StandardPressure Relief Valve StandardTemperature Gauge Standard

OPERATING SPECS


RPM UOM 0 9 18 21 24 27

2400HP 18.3 25.5 34.6 41.6 47.6

CFM 671 572 380 322 246

2800HP 19.2 26.5 38.6 45.6 50.9

CFM 783 667 443 376 305

3200HP 20.6 29.6 43.8 51.6 59.5 68.8

CFM 895 698 595 543 386 86

3600HP 23.0 31.0 45.9 54.1 62.4 72.1

CFM 1007 785 669 611 434 133


NVE 957 Flow Data



Model Number 1457RPM Range 2100-3600Maximum Air Flow-CFM 1350Maximum Continuous Vacuum 27” HGMaximum Continuous Pressure 10 P.S.IPump Drive Rotation CW/CCWShaft Location HI/LOPorting Size 6”Net Weight 742 lbs

4 Way Vacuum/Pressure valve StandardIntake Filter StandardBallast Air Filter StandardBallast Air Silencer StandardExhaust Silencer StandardBallast & Exhaust Check Valve StandardPressure Relief Valve StandardTemperature Gauge Standard


OPERATING SPECS


RPM UOM 0 9 18 21 24 27

2400HP 25.4 35.7 53.8 60.4 67.8

CFM 1040 906 799 661 386

2800HP 28.6 40.2 60.6 68.0 76.3

CFM 1218 1061 936 774 305

3200HP 32.2 48.0 72.5 83.1 91.2 94.1

CFM 1382 1204 1062 878 642 155

3600HP 37.0 53.4 80.6 92.4 101.4 104.6

CFM 1546 1347 1188 982 718 206

NVE 1457 Flow Data

Pump Specifications Continued


Components

SILENCERSNVE offers compatible silencers and filters for it’s blower product line, their performance specifications are listed below. If you choose to use different silencers, make certain they are capable of the performance of factory units.


If using different silencers, they should be tested for effectiveness by blanking off the inlet and monitoring exhaust gas temperature with the blower running for at least one hour. The blower should not overheat. If the different silencers are heavier than the factory supplied units, we do not recommend attaching them directly to the blower as the extra weight may deform the housing casting and cause contact of the lobes to the housing resulting in failure. In this case you must use a flexible joint between the silencer and blower.

Particular attention should be given to the ballast air silencer. Because the ballast air filter is mounted outboard of the silencer, any foreign material in the silencer will be able to enter the blower on initial start up. Ballast air silencers should be inspected and cleaned internally as much as possible. Weld spatter has caused blower failure in the past. Care should also be take to locate the ballast air inlet away from the truck exhaust and blower exhaust to avoid blower over heating.

SYSTEM FILTERS

The system filters NVE offers can be mounted directly to the inlet flange or remotely mounted. If you choose to use a different filter, we recommend that filter to be at least as efficient and have equal or better flow capacities as the factory supplied units. The filters supplied by NVE are a combination of polyester and stainless steel screen and are cleanable. We would recommend a filter of similar construction.


BALLAST AIR FILTERS

The ballast air filters NVE offers are mounted. on the outboard side of the ballast air silencer. (See Page 47) If you choose to use a different filter, we recommend that filter to be at least as efficient and have equal or better flow capacities. The filters supplied by NVE are a combination of polyester and stainless steel screen and are cleanable. We would recommend a filter of similar construction.

FOUR WAY VALVE AND HOSES

If you intend to operate your blower in the pressure mode you will need a four way valve. The valve sizes supplied by the factory are as follows. B743 -4”, B953-6”, B1435-6”. If you do not use the factory supplied units, we would recommend valves of comparable size. We would also recommend you plumb your system with hose of a size equal to the valve size.

PRESSURE RELIEF VALVE

If you intend to use your blower in the pressure mode, you must also use a pressure relief valve. We recommend you use a Kunkle pressure relief valve as they have been proven to work well and have sufficient flow capacity. The valves we supply are factory set to relieve at 10 P.S.I. and are sealed. We do not recommend our blower be operated over 10 P.S.I. and we do not recommend you use imported relief valves.


VACUUM RELIEF VALVES

Vacuum relief valves are typically not needed with our blowers. If your application indicates the use of a vacuum relief valve would be called for, we recommend you thoroughly test your blower system to confirm the desired performance is reached. (i.e. tank protection, overheating protection). We would recommend the use of a high quality vacuum relief valve such as a Kunkle.

CHECK VALVES

If you intend to use your blower in the pressure mode you will need a check valve in the ballast air system and also on the exhaust port. If you intend to use your blower for vacuum only, you need only the check valve on the exhaust port. The check valve we supply are listed below, do not use a smaller valve.

PRIMARY SHUTOFF

The primary shutoffs recommended are listed below. If you don’t use a factory supplied shutoff, we recommend the use of a shutoff of comparable size or larger. It is critical to the proper operation of your system that a shutoff of smaller size not be used.

SECONDARY SHUTOFF

The secondary shutoffs recommended are listed below. If you don’t use factory supplied shutoff, we recommend the use of a shutoff of comparable size or larger. It is critical to the proper operation of your system that a shutoff of smaller size not be used.

BAG HOUSE

Bag houses are typically used for pumping dry material. Specifying a proper bag house depends on the frequency and type of dry material being pumped. If you will be pumping dry material consult the factory for a recommendation.


B747 Part# Specifications

Exhaust Silencer 280-146-747-MS3 Silencer - With Elbow

Ballast Air Silencer 280-146-747-M2 Silencer - With Flanges

Final Filter 280-146-746-FA1 Five micron washable.

4Way Valve 410-004 Cast iron 4” N.P.T. connections.

Pressure Relief Valve 364-306-5 2” Kunkle, Preset at 10 P.S.I..

Check Valve 146-041-747 4” Check valve

Primary Shutoff 200-1206-4NPT 12”x6” Portal shutoff 4” N.P.T..

Moisture Trap 218-017-4R 12 Gallon, 4” N.P.T..


Exhaust Silencer B953-M3 6” absorptive silencer - High temp.

Ballast Air Silencer 280-2024-1BP 5” absorptive silencer - High temp

Final Filter 150-314-597 5 micron washable

4 Way Valve 410-004 6” weld flanges.

Pressure Relief Valve 364-306-3 3” Kunkle preset at 10 P.S.I..


Primary Shutoff F-800-LC-10-6 14”x6”, 6” N.P.T.

Moisture Trap 218-022 25 Gallon, 6” N.P.T.


Exhaust Silencer 280-2021-1BP 6” absorptive silencer - High temp.

Ballast Air Silencer 280-2020-2B 6” absorptive silencer - High temp.

Final Filter 146-1453-001 Intake Filter

4 Way Valve 410-006 6” weld flanges.

Pressure Relief Valve 364-306-3 3” Kunkle preset at 10 P.S.I..


Primary Shutoff F-800-LC-10-6 14”x6”, 6” N.P.T.

Moisture Trap 218-0201 45 Gallon, 6”N.P.T.


MOUNTING

The mounting plate is important when mounting a blower. It must be stout enough to carry the weight of the blower and accessories and not flex when the blower is in operation. It must also be flat and clean so as to not put a bind on the blower housing when it is fastened to the plate. We recommend you attempt to rock the blower on it’s mounting before the bolts are tightened. If any movement in is detected, you must shim the feet until there is no movement.

DRIVE SYSTEM

All NVE blower input shafts are equipped with an outboard roller bearing. This allows for the use of V and clogged type belts. When designing a drive system, consult your suppliers technical information to insured a proper installation.

In general the following applies:

• Insure the blower is turning in the proper direction

• Mount pulleys as close to the blower as possible to avoid excessive overhung load.

• Drive couplings must be mounted within manufacturers specifications.

• Belts and pulleys must be of sufficient size and quantity to transmit sufficient power. If using V-belts, use matched sets, if a belt goes out, replace the whole set.

• Belts and pulleys must be guarded

• Power shafts and U-Joints must be large enough to handle the load.

• Check with your supplier to confirm how much P.T.O. shaft angularity is allowed.

• Hydraulic motors, pumps and cooling system must be of a sufficient size and capability to properly power the blower continuously.


OPERATION

• Turn blower by hand prior to startup to confirm it is not frozen or jammed.

• Check oil level in gear cases daily. Top off as needed.

• Check ballast air and system filters daily.

• Do not operate blower without guards in place.

• Do not engage “Hot-Shift PTO’s” outside of manufacturer’s specifications.

• Wear hearing protection if necessary.

• Take care not to touch blower when hot.

• Do not operate the blower beyond is highest rated speed.

• Drain the moisture trap daily.

• Check exhaust temperatures regularly. If the blower is starting to overheat, check the ballast air filter for restrictions or slightly relieve the vacuum.

TEMPERATURE

• Maximum operating exhaust temperature is 300 degrees F.

• Maximum inlet-exhaust temperature differential is 250 degrees F.

• When starting a blower in temperatures below 50 degrees F, do not allow the blower to develop more than 20” hg vacuum for the first 15 minutes of operation. The rotors heat up faster than the housing. This will allow for even heating of all parts and the blower will maintain proper clearances.

• Extra caution is required when operating the blower ambient temperatures above 100 degrees F. Or at lesser temperatures with high humidity.


MAINTENANCE

• Oil in end plates should be changed every 1000 hours or six months. If the blower is operated in a very high vacuum-high temperature environment on a regular basis, oil change intervals should be shorter.

• Oil tank plugs need to be air tight. Use thread sealer and tighten plugs sufficiently.

• Use only recommended synthetic oil or equal.

• Filters should be cleaned daily.

• System and ballast air filters should be changed every 1000 hours of operation.

• Blower Housing and Manifold should be kept clean to allow heat to radiate out.

• If the blower is flooded it can be cleaned using the following procedure

• Remove inlet filter, exhaust and ballast air silencers.

• With high pressure water, clean intake exhaust and ballast areas.

• Have an assistant slowly turn the input shaft as you clean the lobes with water.

• Run the blower at the slowest speed possible and continue to spray water into the machine until the discharge has only clean water

• Run blower and spray a small amount of penetrating oil into the intake and run until no liquid comes out of the exhaust.


(NOTE - DO NOT SPRAY OIL INTO THE BLOWER WITH SILENCERS IN PLACE)

• Disassemble the manifold and examine the silencers for signs of contamination. If the blower was flooded it is highly probable the exhaust silencer has material in it as well. Clean it out as best you can. The same holds true for the ballast air silencer.

• When everything is clean and dry, reassemble the manifold. Make sure to tighten blower flange bolts evenly.

• Oil tanks are full when oil level is in the middle to top of the oil sight.

RECOMMENDED LUBRICANT

We recommend that high quality ISO 220 synthetic gear oil be used in our blowers. Synthetic oils are much more resistant to break-down due to heat than normal oil. If a synthetic is not available use ISO grade 200 gear oil. Oils must have rust, foam and oxidation inhibitors. Synthetic:

1. Summit Syngear SH-7220

2. Mobil SHC 630 (32o to 90o)

BLOWER OIL CAPACITY - DO NOT OVERFILL Drive Side Non-Drive SideSize Oz (Liters) Oz (Liters) Total747 18 (.53) 8 (.24) 26 (.77)957 48 (1.42) 24 (.71) 72 (2.13)1457 44 (1.30) 33 (.98) 77 (2.28)


TROUBLE SHOOTING

If the system has low or no vacuum check the following

• Inlet filter - clean.

• With the blower running and the filter clean and in position, place your hand on the filter to confirm normal air movement. If no air movement is noticed remove the exhaust silencer and check for air movement at the filter again. If there is movement at this time you have a plugged exhaust silencer or manifold.

• Moisture trap - full, shut off.

• R.P.M. too slow, worn belts, hydraulic or drive system problems.

• Plugged or collapsed hoses. (You can’t always see a collapsed hose from the outside).

• Leaks in the tank or fittings

• Four way valve not in proper position.

• Faulty relief valve.

Over Heating

• Ballast air filter dirty - clean.

• Over speed - slow blower

• Over vacuum - relieve vacuum

• Clearances in blower not adjusted properly.


KnockingKnocking is an indication of the lobes being out of time. The timing of the lobes should be undertaken by a qualified repairman.

Oil LossExcessive loss of oil indicates seal failure or the seal ring vents are plugged.

REPAIR - REBUILDTo follow is a detailed instruction manual for the disassembly and assembly of blower. Like many things mechanical, it comes apart much easier than it goes together. Therefore, we recommend only qualified technicians attempt to repair NVE blowers.

*SPECIAL TOOLS

There are three tools of a special nature required to assemble a

NVE blower. .

1. 24” x 24” granite surface plate

2. 24” height gauge

3. Dial indicator calibrated to .0001 inch.


Pump Rebuilding

NVE Blowers

Please read these instructions completely before attempting repair.

1. Vent the top plug to relieve any trapped air. Remove lower magnetic pipe plug on both ends of the blower and drain the oil. Make sure to thoroughly clean the magnetic end of each plug.


2. Remove the (10) socket head cap screws and (2) shoulder bolts holding on the follower cover plate.

3. Remove the cover plate.

4. Use a wooden object placed into a port, between the rotors, to keep them from spinning. Remove the (2) hex head screws centered in each oil slinger.

5. Remove the oil slingers.


6. Remove (12) socket head cap screws holding on the follower end plate, and slide off the end plate.

If the Blower is being disassembled to change rotator or shaft position skip to operation #57.

7. Remove the (10) socket head cap screws and (2) shoulder bolts holding on the drive cover plate.

8. Remove the drive cover plate.

9. Remove hex head cap screw and gear retainer on idler gear.


10. Slide off blower idler gear, square key will fall out once gear is removed.

11. Slide off idler gear spacer.

12. Use a bearing puller to remove the seal sleeve and bearing inter race. Be very careful not to damage the shaft.

13. Loosen the (7)socket head cap screws on the B-Lock retainer. Remove (3) of the screws and use them in the (3) jack screw holes to loosen the retainer and drive gear.


14. Remove drive gear.

15. Unbend tang on star washer.

16. Use spanner wrench to loosen lock nut.

17. Remove lock nut and washer.


18. Remove (8) hex head screws

19. Slide off the bearing retainer plates

20. If the rotors do not come out by hand a light tap with a rubber mallet will loosen the rotors.

21. Carefully slide the rotors out.


22. If the ID seal sleeve and inner race don’t come off by hand carefully tap the I.D. seal sleeves and bearing inter race off of each end of both rotors.

24. Block up the end plates and tap out the bearings and O.D. seal sleeves, from the inside out.

23. Inspect the seal I.D. seal sleeves, bearing races and rotors for excessive wear


25. Remember to mark each piece so they can be put back where they came from.

26. Remove the (4) hex head bolts located on the inside of the drive cover plate.

27. Turn the cover plate over and tap out the bearing then the seal.


28. Scrape all old gasket material off.

29. Clean all the parts thoroughly and inspect the housing, end plates, cover plates and rotors for wear.

31. Check the seal assemblies for excessive wear, and the cast iron seal rings should spin freely in there grooves.

30. Check the bearings to make sure they spin freely and are not to loose or worn.


32. Rubber seals and o-rings should be pliable, soft and free of any cracking. Replace any that are hard or cracked

33. Check housing for excessive wear

34. Seat new seals into the matching assembly and put on a new o-ring. Rebuild (2) of the seal assemblies


35. Install the rebuilt seal assemblies into the drive end plate.

36. Insert new bearings into the drive end plate.

38. Using a ring compressor install the inside of the seal assemblies to complete the matching sets.

37. Install bearing retainers.


39. Line up the dowel pins, and mount the drive end plate to the housing.

40. Brush some oil on to the seal assemblies.

41. Insert the rotors into the housing. Be careful not to rip the seal assembly I.D. o-ring on the threads of the drive rotor.

42. Slide the idler gear in place, lining up the key way slots.


43. Push the key into place.

44. Bolt the gear retainer in place, and tighten the hex head cap screw to torque of 115 ft/lbs.

45. Slide the star washer in place, with the inside tang in the drive rotor key way.


46. Tighten down the lock nut to 125 lb-ft to ensure the inner race dose not slip and bend a washer tang into one of the lock nut slots.

47. Slide the drive gear into place on the drive rotor.

48. Add the (7) socket head cap screws into place in the B-Lock retainer but do not tighten them. Align the two gears.

49. In order to properly time the blower (4) shims must be used (3) .004 shims and (1) .012. Place a .004 shim in between both lower lobes on the bottom rotor and the housing, and one above the top rotor upper lobe and the housing. Place the .012 shim between the top lobe on the lower rotor and the saddle of the upper rotor.


50. The critical step in timing the blower is to make sure that both the upper and lower rotors are in exactly the same position rotationaly within .0005.

To accomplish this you will need a granite surface plate and a height gauge with a dial indicator calibrated in .0001 of an inch.

51. To do this use a height gage to make sure both lower lobes on the bottom rotor are at exactly the same height. Then using the tapped holes in the housing clamp them in place.

52. Then do the same to the lower lobes on the upper rotor, clamping them in place also.

53. After both rotors are in exactly the same place rotationaly and clamped in place tighten down the B-Lock retainer. Using a torque wrench set at 30 ft/lbs. Turn each cap screw 1/4 turns only and use a clockwise or counter clockwise rotation.

54. Seat the seal assemblies into the follower end plate.

55. Insert the bearings into the follower end plate. Attach the special retainer plates to keep the bearings in place until the follower plate is installed.


53. After both rotors are in exactly the same place rotationaly and clamped in place tighten down the B-Lock retainer. Using a torque wrench set at 30 ft/lbs. Turn each cap screw 1/4 turns only and use a clockwise or counter clockwise rotation.

54. Seat the seal assemblies into the follower end plate.

55. Insert the bearings into the follower end plate. Attach the special retainer plates to keep the bearings in place until the follower plate is installed.


56. Turn the plate over and use a ring compressor to insert the inter seal assemblies.

57. Mount the follower end plate to the housing.

58. Tighten down the socket head cap screws to a torque rating of 105 ft/lbs.

59. Take off the special retainer plates, and install the proper bearing retainers.


60. Install the oil slingers.

61. Tighten the hex head cap screws to 115 lb-ft.

62. Heat the bearing race to 225 F maximum and quickly slide it onto the drive rotor until it shoulders out (see Below).


63. Heat the seal sleeve to 225 F maximum and quickly slide that on tight to the bearing race.

64. Add the new seal, lip side up, and the bearing to the drive cover plate, and lubricate the bearing and seal.

65. Add a light coat of liquid gasket to both the drive cover plate and the follower cover plate.


66. Add the paper gasket to both of the cover plates and mount them in place.

67. When bolting them down remember to put in the socket head shoulder bolts first and torque all the screws to a rating of 25 ft/lbs.

68. Now that the blower is completely assembled add the recommended oil into the follower end and into the drive end. Fill the tanks until the oil reaches the top of the site eye.


Notes


NVE 747 Blower

1

1

2

2

3

3

4

4

A A

B B

C C

D D

NVE NationalVacuum

Equipment, Inc.2670 Aero Park Drive, Traverse City, MI 49686Phone: (231) 941-0215 Fax: (231) 941-2354

TOLERANCES UNLESS OTHER WISE SPECIFIED

One place (.X) ± 1/8Two places (.XX) ± 3/32Three places (.XXX) ± 1/16Angles ± 1°Remove all weld spatter after welding.All machined surfaces 125 RMS max.Remove all burrs and sharp edges.CAD drawing - NO manual changes.All dimensions in inches unless specified.

This document may contain confidential tradesecret information which is the exclusive

property of National Vacuum Equipment. Anyinformation on this drawing is not to be

disclosed to anyone not having a "Need toKnow." The information contained herein is to

be used only in accordance with the bestinterests of National Vacuum Equipment.

PART NAME:

146-747-MANMATERIAL:

DRAWN BY:

SCALE:

CHECKED BY:

DATE:JGP

PART NO.SHEET1 146-747-MAN1 of

N/A

SHEET SIZECAD FILE LOCATION: C:\Program Files\Autodesk\Inventor 2009\Templates\NVE Block Temp Fab.idw APPROX. WT.

C

REVISION HISTORYREV DATE DESCRIPTION APPROVED ZONEA

31.20

22.42

9.56

38.49

48.76


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Notes


NVE 1457 Blower

NVE 1457 BlowerDrive End View

NVE 1457 BlowerTop View

NVE 1457 BlowerOutlet Port Side View


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957

SPA

CE

R, B

LOW

ER

RO

TOR

1415

0-61

3-95

7TI

MIN

G G

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R, I

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457

1515

0-63

8-95

7R

ETA

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R, I

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R R

OTO

R, 9

57/1

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1615

0-64

6-95

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HE

R, L

OC

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57/1

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0-64

5-95

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CK

NU

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57/1

457

1815

0-64

1-95

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ETA

INE

R, L

OC

K N

UT,

957

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719

150-

612-

957

TIM

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AR

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957

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720

150-

624-

957

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TAIN

ING

RIN

G, B

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2115

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LIN

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722

150-

003-

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PLA

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150-

622-

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BE

AR

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311

(55X

120X

29)

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MPA

RT

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MB

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DE

SC

RIP

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2415

0-63

6-95

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R, N

ON

DR

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D25

150-

623-

957

BE

AR

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310

(50X

110X

27)

2615

0-63

7-95

7O

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LIN

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ON

DR

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150-

620-

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SE

AL,

VIT

ON

(60X

85X

8)28

150-

009-

957

SE

AL

SLE

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35M

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627-

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EN

DC

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457

3015

0-63

9-95

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KE

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57/1

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R, N

ON

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5732

SE

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IN P

LUG

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” NP

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AG

NE

TIC

3315

0-04

8S

IGH

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YE

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120-

047

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AIN

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PT

3515

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6-95

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KE

T, F

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4-60

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FG

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KE

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TMA

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IBE

R36

150-

617-

957

FLA

NG

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LAN

K, 9

5715

0-61

7-14

57FL

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, 145

737

150-

082-

957

BO

DY,

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UG

E38

150-

644-

957

BR

AC

KE

T, S

IDE

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UN

T O

IL G

AU

GE

39S

EE

DE

SC

CO

UN

TER

SU

NK

HE

X H

EA

D P

LUG

4032

0-60

1FI

TTIN

G, O

IL G

AU

GE

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4132

0-62

0-95

7H

OS

E, O

IL G

AU

GE

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INLE

SS

4232

0-60

2FI

TTIN

G, O

IL G

AU

GE

OIL

TA

NK

, 747

4315

0-68

3C

AP,

BLO

WE

R O

IL G

AU

GE

44S

EE

DE

SC

KE

Y .5

X .

5 X

2.5

4519

0-02

0-4

WA

SH

ER

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LVE

, VIT

ON

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EE

DE

SC

DIP

STI

CK

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WE

R G

AU

GE

47S

EE

DE

SC

DO

WE

R P

IN, 1

/2”-

1 LG

UN

HA

RD

EN

ED


Notes

owner’s manual operating instructions - nve sales repnational vacuum equipment, inc. was founded...

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