Gearbox Tooth damaged

Hi Gents ,

we have issue with our gearbox where the trust shaft is been damaged and our gearbox stopped at certain temperature and certain speed and we have to slow down the speed to avoid high lube temperature
Our gearbox temperature around 67 c and stopped around 69 c and the Maintance team provide a chiller cooling system to cool down the oil but we still have issue with reducing the speed .
Using higher viscosity oil can help or not ?
Changing the bearing can help to increase the speed and out put or not ?
 
Hi Gents ,

we have issue with our gearbox where the trust shaft is been damaged and our gearbox stopped at certain temperature and certain speed and we have to slow down the speed to avoid high lube temperature
Our gearbox temperature around 67 c and stopped around 69 c and the Maintance team provide a chiller cooling system to cool down the oil but we still have issue with reducing the speed .
Using higher viscosity oil can help or not ?
Changing the bearing can help to increase the speed and out put or not ?
Hi Azer,

What you mean by "trust " are you meaning "Thrust"...

What is Unit OEM /type/model
 
Changing bearing can be solution but we do not know about origin of the issue...
Can you be more specific/better explanation on how this happened...
Is that some work have been done prior to this event...
 
What ia msayin is that , There could be others reasons than bearing and how to solve the problem can be different...
Did the unit experienced any abnormal vibrations ...
 
Okay ,
Will be lookin to these details..

Do not forget that it is a "load gear box" ....so search first the origin of the problem before to know what to do ( changing a bearing ...you should explain it clearer ..as you mentionned that "tooth damaged"...

We do not know about plant operations till the incident happened..

Best for all!
 
I'm wondering how this is controls-related .... The vibration in the gearbox is high; we don't know if that started before the damaged tooth, became worse after the tooth was damaged, or ???

Regardless, how is this controls-related? And, if there is an issue with the speed of the gearbox, it's not a generator drive application, it's most likely a compressor drive. But the original poster hasn't told us anything of value.

The original poster has identified himself as an engineering manager. But we have no actionable data. The thread subject is a damaged gearbox tooth. There's nothing in the original post or after about a damaged tooth. Is that's what's causing the high vibration?

The "question" was: To change to a higher viscosity lube oil, and/or to change the bearing?

Bearings? Gears? Teeth? Oil viscosity? Not controls-related.

Just sayin' ....
 
•High Temperature issue Machine Trip (3rd Dec 2020)
•Pre Checkup of oil circulation found 2 ltr/minute (Standard 49 ltr/Minute)
•Open the gear box and clean found oil sludge inside the gear box
•Clean and replace the oil
•Temperature not satisfactory (58c)
•5th Dec Remove the thermocouple sensor.

•High Temperature issue Machine Trip (13rd Dec 2020)


•Open the gear box inspect found metal pieces or gear
•Clean properly and inspect the gear, main driven gear found damage.
•Oil change and start with low speed
to be clear we know our gearbox is damaged and we need to replace it with new sit but we need temporary solution for this issue which is high temperature lube oil alarm on our Extruder and that way I asked directly to cooling or oil and if you wonder why this is happened (there was misalignment cause
Scoring on the gearbox.
 

Attachments

Okay

Looks like you mentionned "extruder" can we know the prime mover type If gas turbine Frame unit...

I use to see Flender or Graffestanden Load gear box not this model...
 
Since The Antigo manufacturing facility is supported by engineers in Waukesha, Wisconsin, and Pawcatuck, Connecticut. To serve its global customer base,

Waukesha Bearings Corporation leases 4,662 SF office in Pawcatuck, CT
 
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