Tagged With "Gearbox"

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high vibration at gearbox and motor only in one rolling section

sany ·
Hi i am attaching one document please go through.. High vibration is observed at 25mm rolling section only same Equipment doesnt have vibration in 12mm, 16mm, 20mm, 32mm, 40mm rolling.. A peak is observed at less than 1x rpm which is domianant in this section.. Suggest me some solution
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Chain Lift Motor/Gearbox 1/2X

Mike Gawlik ·
I am hoping someone can help me out a little. I am fairly new to the PdM game and since we started to perform vibration on our VFD driven motor/gearboxes that run a chain lift for ride vehicles. (Think rollercoasters). Anyway, the issue we see on all of the motors and gearboxes that run these lifts is a high peak around 1/2x (it varies slightly per ride/lift) In the attached file, you can see that we have a 0.533 order peak on all measurement points for the motor and gearbox. This value will...
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Sub synchronous peaks at gearbox of steam turbine

JRVA ·
Dear All, Good day! We are experiencing high vibration problem at gearbox of 10 MW steam turbine (GE made) during start-up condition. Spectrum is showing sub-synchronous peaks (0.2 X, 0.4 X, 0.6X and 0.8 X) during start-up only which disappear when machine gains full speed. Amplitude of these peaks are up to 28 microns and is directly related to rpms of machine. Never seen anything like this before. Expert opinion is required please. Best Regards,
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belt drive gearbox vibration

Hossam 2 ·
im facing a strange problem at the plant is that the drive set for the belt is vibrating excessively at the beggining of the operation but after while the vibration reduced sharply after 1 hour i will provide you by the complete data shortly
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High temperature issue at double helical gearbox after revamping.

Ngo Dinh ·
Dear All, I have a case of high temperature issue at double helical gearbox which journal bearing temp of HSS increased to 103oC after 3 months and then fluctuated from 83 to 102oC. What done are: major maintenance for GB and revamping for Ammonia unit. It means the load increased 107-110% than normal. I summarized the information and my solution in slide. Hope to receive your discussion and any advice. Thanks & Regards,
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High Vibration In Gear box, multiple of TS but not GMF

Jimmy V. ·
Looking for some assistance on a high speed gearbox vibration problem. I have a attached several files of and the one labeled vibration history will give a overview along with some data. The gearbox amplitude reached .72 ins and 159G's peak to peak. The frequency appears to be a multiple of TS but does not line up to anything, and the dominate frequency changes from month to month. From 3414hz, 3596hz, 3775hz, 4133hz, 4495hz,. Fault Frequencies are below. Motor trend is stable and low,...
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High Axial Vibration in Gearbox

Soumya Mishra ·
Dear Sirs I need help regarding high axial vibration in gear box of a blower. I have attached all the details. If any further data required kindly reply. High vibration observed after replacement of impeller. No maintenance was carried out on the motor-GB side.
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Gearbox between a steam turbine and generator.

Sarah M ·
Good afternoon everyone, I am back in search of guidance and wisdom, ok I need help. My senior is out for a week and I am left to my own experience. I took readings on a turbo generator yesterday that had me concerned last month with high axial vibration on the outboard sleeve bearing of the input shaft. These readings are from a magnet mounted accelerometer which is not optimal for a sleeve bearing application but is used for condition monitoring. Last month the readings came out to 11G's...
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High 1x Throughout Motor and Gearbox

Jake1 ·
Hello, Relatively new to vibration analysis and have been following this forum for a few months. Thanks in advance for all the great information I've gotten just from reading here. At my facility we have a screw conveyor that is critical to our operation. It has been a problem child for years before I ever joined the company. Both the motor and gearbox were upgraded about 2 years ago to combat quarterly monthly motor failures. However, we are still having issues that appear only 1 to 3...
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Broken Gear Shaft

Jenish ·
Dear Experts, Can anybody give any expert opinion about this Broken Shaft? It is from a stand gearbox of a rolling mill..
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HIGH 2X PEAK AT GEARBOX INPUT SHAFT IN VERTICAL DIRECTION

sany ·
Hi One of the Vertical Mill stand Gearbox is having high vibration at Gearbox input shaft in vertical direction, 5.6mm/sec peak. A 2x dominant peak is observed and the absolute phase has taken at both motor and gearbox and is very erratic. a doc has been attached.. Can any one suggest some solution
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Solar Titan 130 gearbox data need for conditioning monitoring troubleshooting

Monitor man ·
Do someone have data of a Titan 130 gearbox, Bearings and Z per shaft in gearbox.
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Gearbox vibration values at slow roll

vibramac ·
At speed vibration levels from this 'double helical up-mesh increasing' gearbox are acceptable; however, on run down these levels exceed 100 micrometers pp, suggesting the pinion is being deflected (horizontally) by this amplitude on observation of the shaft centreline plot. A gradual increase in pinion vibration levels is seen after 700 rpm (<500 rpm highlighted in red). The bull gear vibration levels remain unchanged from full speed to standstill (<30 microns pp). The unit needs to...
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Unknown Frequency in Planetary Gearbox

jvaugha1 ·
Hi, I have been watching a frequency that I can not identify for a year now. It has been increasing every time I take a reading. The frequency is at 55,195. It looks as if it could be a side band of 2xGMF but I think it is an independent frequency. It has increased from .82 mm/sec in November last year to 6.697 currently. I can see this frequency in the motor and 2nd stage of the gearbox but has only increased in amplitude in the 1st stage. Any help is appreciated. I will try to give all...
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Gearboxes and pumping units

RobPme ·
Pinnacle maintenance engineering is a pump & Gearbox repair and service company that has freedom to work on all manufactured brands without restriction PME's attention to detail begins from the moment your equipment arrives at our facility. All rotating equipment is disassembled and goes through a rigorous inspection and analysis. Once our engineers have determined the best course of action to restore your rotating equipment back to proper specification your project will be given the...
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Reason for frequencies less than 1XRPM in planetary Gearbox

vidya Sagar ·
Hi Friends, In one our planetary Gearbox we observing non synchronous frequencies below 1XRPM. The vibration at Gearbox i/p is varying from 15 mm/sec to 20 mm/sec and the mill is frequently tripping due to vibration.What could be the possible reason for non synchronous frequencies and how to eliminate it. Please find the spectrum for reference.
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Vibrations in hollow -shaft mounting gearbox

Rajj ·
We have one hollow shaft mounting, two input gearbox having gear ratio 14.3 to drive paper machine drying cylinder. It is pivoted at one side and driven by two D.C. motors of 210KW with cardon shafts. Gearbox has high vibration levels in vertical direction opposite to pivot end. At 750mpm ( 945 input rpm), we get max vib.at gearbox in H & A direction @4mm/sec. and 11 mm/sec in V direction opposite to pivot end. Mostly at 1Xrpm & 2Xrpm of input speed. Is it safe to run at such high...
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High acceleration of the gearbox casing

Riro ·
I would like to ask you for a recommendation regarding the existing problem of high acceleration of the gearbox casing. The gearbox is single-stage with cylindrical helical gears. It is installed between LP and HP centrifugal air compressors. Available gear unit data: rated power: 6491 kW bull gear speed range: 5280 rpm – 6480 rpm pinion speed range: 9000 rpm – 11040 rpm number of teeth on the bull gear: 99 number of teeth on the pinion: 58 The gearbox accelerations are measured with two...
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Gearbox Thrust Bearing BPFI due to known high axial load issue and estimation of remaining life of Bearing

Ayaz Ahmed ·
Dear Experts, On 12-Jan-2016 we overhauled a Gear box driving huge axial flow pump (This Pump is the other pump just next to the pump for which I had previously asked a query) through a U-joint coupling. We observed damaged Double Row Spherical Roller Bearing (22232 Bearing installed at free end of Output/ LS shaft @ ~214 rpm) due to High Axial thrust forces on Gear Box from the pump side which is eminent from severe damage on Outer side of Inner row of Spherical rollers. The damage clearly...
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Odd vibration from gearbox

tcvib ·
Have an odd scenario from a reducer,  We have a 151 Hz peak that resembles gearmesh freq.  but gearbox rebuild shop information does not match for that frequency.  gear teeth counts are not conflicting.  Curious if anyone has seen this before.  gearbox is a double reduction, parallel shafts,  1192 input speed, teeth counts are 25 on HS pinion,  Int shaft has 46 teeth on the bull and 20 on the pinion,  Output shaft has 103 teeth.  This is from the...
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Helical Gearbox failure and sub-synchronous axial vibrations

msmemon ·
Hi , I have seen a number of very useful posts on this forum specially on the gearboxes and would like opinion of members on failure of double helical gearbox with three teeth of compressor side helix found broken during a preventive maintenance inspection. The unit consist of a VFD driven 7 MW motor (1800 RPM), a speed increasing double helical gear and a compressor. The failed Gearbox had operated about 25000 hours since installation. The history of this unit is that it was commissioned in...
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High horizontal vibration on gearbox

Engr Aamir ·
i have a dynamic separator fan in cement mill area. a motor, gearbox and a fan. gearbox has 2 shafts. i m facing 1x horizontal high vibration 8.5mm/sec and 8mm/sec on shaft 2 DE and NDE side. All other points showing less than 1mm/sec including Motor. also find attachment
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High Vibration peak at 110Hz

Avinash Thawani ·
I am getting a high vibration peak at 110 Hz and it is there in the pump. The pump speed is 68Hz. This is a horizontal pump with a gear box between the motor and pump. Kindly advise what is the cause.
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TWA : gearbox

azizsuahid ·
Machine: Helical type Gearbox Location: 4 TWA H, 4 EN3 H, input nde Type: Single reduction 1480 / 349 cpm, TWA setting lor 3200/ end f. 2800cpm. Result pk pk 50g. Obvious modulation at input speed. Envelope ~40 gE pk-pk for two weeks Suggestion: to stop plant by mid june which is 4 weeks from now juz to replace the gearbox. I have a feeling to replace It by next week. But i am also facing downtime n production target. Thank you for reading and kindly comment...
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Set up for Gearbox Vibration Measurement point

Mrunal Dave ·
Dear Vib Legends, We are about to set up the vibration measurement points for gearbox (N1: 1488 rpm, no of teeth unknown) with the following : 1. Velocity spectrum (Fmax 120000 cpm, 3200 and 6400 lines, 4 linear Averaging with hanning window) 2. Acceleration and Env Spectra: Your inputs are required. Please advice. We are awaiting for some reference set up examples. 3. Time waveform analysis: Fmax 5850 Hz, 4096 samples. Please suggest if required some correction or your inputs please for the...
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Finish Mill Stand Gearboxes

Phil2425 ·
I am seeing a 1x vibration in our Finish Mill Stand Gearboxes. I know that a broken or cracked gear tooth will cause this issue, however we have opened up a box and did not see ay signs of a cracked or broken gear. Some of our other stands...
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Finish Mill Stand Gearbox

Phil2425 ·
I am seeing 1x impacting in waveform data from a gearbox. We have opened the box up to replace a faulty bearing. We inspected the gearsets and did not find any signs of broken or cracked gear teeth. I know that other stand and other mills have a 1x...
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fluid coupling mounting

alainraad ·
there is any problem if a fluid coupling is mounted in the wrong direction? the input on the gearbox shaft and the out on the motor? the coupling is flender fludex FAD 297. for me i think that there is no problem, in case that the gearbox shaft can...
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Peculiar noise from Gearbox

Nagaraja ·
Came across a gearbox driven by a 400 kw turbine   Turbine input speed: 8700 rpm and bull gear output speed: 1000 rpm   No problem till ouput speed 900 rpm, set will be running smoothly   Once the set crosses 950 to 1000 rpm...the...
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Equipment protection for storage

Alvin MC ·
Im looking for best practices when it comes to protecting storage equipment like pumps and gearboxes for an extended period of time? Do you store equipment with just vaprotech or cortec for preservation? How about storing them with mineral oil and preservative? If so, what should be the oil level? fill the whole housing? Thanks
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Creating an epicyclic gearbox with RBM wizard

Ardalan ·
Greetings, I have some problems when trying to create an epicyclic gearbox with RBM wizard in AMS machinery suite, we have a gear box that has a bevel gear as an input from the drive, which is connected to the first stage's sun by a bull gear and a shaft, the problems to create such gearboxes with RBM is as follow: You can only create one type of gearboxes at time (simple or epicyclic), and when you choose epicyclic you will not be able to have the bevel gear inside, you only have the...
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An unknown frequency observed at Gearbox

sany ·
Hi, This is equipment of Steel Industry from Bar Rod Mill unit. Equipment is Mill Stand, Which is having reducer gear. The Input shaft have 24teeth and mating gear has 63teeth. Intermediate having 19,66 teeth and output shaft having 31,31teeth. I didnt have any problem with vibration whenever the higher dia bar is rolled vibration will be 4.0mm/sec peak and during lesser dia bar rolled it will 2.5mm/sec peak. The spectrum is showing a high amplitude dominant peak of 73.1orders of input speed...
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Cooling Tower Gearbox Failures

rgf12 ·
Attached is a report on a recent GB failure on one of our plants cooling tower fan drive gearboxes. It looks to me that the concentration of the failure area on the shaft side of the gear would indicate either a misalignment under load or a general...
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what are the odds?

Nockingroll ·
Conveyor drive pulley with 2 drives fixed speed 4 pole induction motors through fluid couplings and triple reduction gearbox's. drive b the bad actor has had 3 motors in the last 18 months and consistently pulls 40 -80 amps more than A drive (the good...
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Conveyor Gearbox high axial vibration

VANDA BAB ·
Hi every one   iam having problem in Gearbox high axial vibration (High speed I/p shaft)   Conveyor for coal handling in Thermal power station maintaining high axial vibration: (H: 4.0mm/sec    V: ...
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GEARBOX PROBLEM IN STEEL PLANT

dominich.vo ·
Hi all,  I get a problem to monitor a gearbox with variable speed in steel plant. The detail has been described in attachment. the spectrum data shows many of harmonics of turning speed .  So, what's problem with this gearbox and what generates harmonics in spectrum data?   Thanks and regards ! 
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Cross Phase analysis issue

Hossam 2 ·
Problem is in motor if atox mill (insaldo) The free end has a 4xts dominent vibration we have balanced it to reduce one x from 3 to 0.3 mm/s vut still over all value is 5.5mms wiz 4xts sharp  The phase relationship is weired as 180 phase difference between the drive end and non drive end in the vertical direction ..i suspect misalignment problem and the other issue is that no sensors give exact reading across the coupling specially in the gearbox side always give real value in the motor...
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Abnormal vibration at gearbox of pump

Ngo Dinh ·
Hi everyone, I have a case with gearbox of the pump which after maintenance (checking gear, backlash, realign gear set and whole train) the gearbox operated with higher vibration with unstable amplitude as file attached. I also open the sign plate at top of gearbox to see the teeth but it is noted that there is no teeth failure. With the input gear with 87 teeth and pinion with 33 teeth, I think that at assembly time, the maintenance staff do wrong phase meshing of teeth contact. So, the...
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Gearbox Bearing Failure

Alvin MC ·
What could cause an inner ring to fail like this? This is from a rotary valve drive gearbox. Gearbox is a small 37.5 to 1 ratio. This bearing was on the input shaft and you can see the hole on the shaft where it had a pin to hold the pinion gear to the shaft. The pin was sheared and broke off. The bearing cage and balls were destroyed from the failure.
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Duolec ISO 220 in gearbox

Vibsouth ·
Hi Guys have any of you tried running Duolec ISO 220 in a industrial gearbox? is it a good product?
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Possibility of 0.5X GMF in a three stage reduction gearbox???

Sudarshan Nandakumar ·
Hello Everyone This is regarding a 3 stage reduction gearbox used in Tyre industry. The gearbox has been running for the past 20 years with original set of gears. No major overhauls are carried out apart from replacing input and intermediate stage bearings few years back. This is the first vibration study carried out on this equipment. Input shaft rotational speed during measurement is 19.8Hz and the input stage gear mesh frequency is at 277.7Hz, intermediate stage at 62.7Hz and output stage...
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High gearbox housing vibration

Santosh Shankarappa ·
Hi, GB details: Double stage single helical for cooling water pump application. Power: 1450kW; Input/Output speed: 5900/590 (10:1 ratio) Recently I was shared a site vibration data of a high speed gearbox , The housing vibrations measurement details are attached; From the spectrum data , the dominant frequency is at 53,000 cpm which is close to 9X of Input pinion shaft rpm. The vibrations are found dominant at pinion shaft non drive end (28 mm/sec) Kindly share your views. Santosh S
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High Slow Roll Reading on 1 Probe

DuPlesis ·
Guys, I have a Solar Titan 130 Gas Turbine. It's a 2 Shaft Gas Turbine. 1st Shaft - Gas Producer Rotor - Consists of Axial Compressor and 2 Stage Gas Turbine. Air Intake End of this rotor is connected through a spline coupling to the accessory drive gearbox. Please see attached layout image. 2nd Shaft - Power Turbine Rotor - 2 Stage Gas Turbine Discs providing mechanical drive to the Centrifugal Gas Compressor All the radial bearings are fitted with X & Y proximity probes. Slow Roll...
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gearbox repair

Gearbox repair ·
keith bradshaw first choice machine (832) 886-7207 email keith@fcmrepair.com website firstchoicemachine.com Gearboxes are rebuilt and repaired to meet O.E.M specifications to achive our customers needs no matter the extent of damage broken cracked chipped worn out or obsolete first choice machine offers the highest Quality gearbox repair Back To Them Within Days We Guarantee 60% Savings Form The O.E.M We Consistently Update Our Customers To Put Their Mind At Ease We Try To Make It As Easy As...
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Raw Vertical Mill

Hossam 2 ·
Dear Experts i face a problem at a raw vertical mill MAAG Gear model WPU (forcing frequencies are attached at the file) Gearbox type : Epicyclic gearbox problem existence is only on load when the rollers at the grinding table , a unique ferquency shows and its amplitudes fluactuates reaching the alarm level and the shutdown level ,this frequency has a broadband energy and such frequency dosent related to the forcing frequencies at all at the attached file. thanks for help
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Gearbox Vibration

Yasaswy ·
Dear gentlemen, There is a peculiar case of gearbox vibration in one of our plants. We have a centrifugal overhung blower connected to a gearbox and motor. The issue is high vibration (current value 138 micron and trip at 140) in gearbox DE bearing (in both X & Y probes). The vibration levels in the remaining gearbox bearings is normal at 20 micron. Motor vibration is also normal at 20 micron and blower vibration is also normal at 15 micron. 1. The vibration is high only at Gearbox DE...
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Re: Finish Mill Stand Gearbox

John from PA ·
What I see is an overall of 0.0641 in/sec pk, which is not alarming in itself, but I do see a crest factor of slightly over 4. Is this behavior something recent or has this been this way for some time? Any idea is there has been an upward trend of the crest factor? Can you take the gearbox out of service and inspect the teeth using a dye penetrant method? Audibly, does the gearbox have a pronounced "knocking".
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Re: Finish Mill Stand Gearbox

Phil2425 ·
There is not an audible knock. You can just feel a 1x thud when operating. We changed spindle components and it got somewhat better. Just very curious as to what it is.
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Re: Finish Mill Stand Gearbox

Phil2425 ·
The Crest Factor has always ran between 3 - 4.
Reply

Re: Finish Mill Stand Gearbox

John from PA ·
Is the behavior of the impacting in the waveform something recent? Or perhaps first time observed? In light of the overall amplitude of 0.06 I'd be inclined to just watch carefully. However, if that evidence of impacting in the waveform just suddenly started I would have some concerns. By the way, what are the speeds and tooth counts of this gearbox?
 
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