alex g Posted September 8, 2020 Share Posted September 8, 2020 I have a 2000 CH with E7 350. On Sat I noticed a strange noise while idling. Kinda sounds like a pump when it's low on oil. I've checked fluid levels pulled fan belt of and ran truck. Engaged and disengage clutch no difference. Held high tech broom handle against engine trying to trace and nothing. Any help would be appreciated Quote Link to comment https://www.bigmacktrucks.com/topic/64155-strange-humming-noise/ Share on other sites More sharing options...
fjh Posted September 8, 2020 Share Posted September 8, 2020 Take the belt off see if the noise is there ! Quote Link to comment https://www.bigmacktrucks.com/topic/64155-strange-humming-noise/#findComment-460418 Share on other sites More sharing options...
alex g Posted September 8, 2020 Author Share Posted September 8, 2020 Thanks I already did that. No change Quote Link to comment https://www.bigmacktrucks.com/topic/64155-strange-humming-noise/#findComment-460444 Share on other sites More sharing options...
Hayseed Posted September 9, 2020 Share Posted September 9, 2020 When you had the belt Off, Did you give everything (Alternator,Fan Hub, Idler pulley, ECT.) a Spin By hand. to see if there's a bad bearing somewhere ??? Quote "Be who you are and say what you feel...Because those that matter...don't mind...And those that mind....don't matter." - Link to comment https://www.bigmacktrucks.com/topic/64155-strange-humming-noise/#findComment-460450 Share on other sites More sharing options...
alex g Posted September 9, 2020 Author Share Posted September 9, 2020 Yes I did. I also held broom handle against them with belt on. No strange noises there Quote Link to comment https://www.bigmacktrucks.com/topic/64155-strange-humming-noise/#findComment-460473 Share on other sites More sharing options...
Popular Post staxx Posted September 9, 2020 Popular Post Share Posted September 9, 2020 Check or replace centramax filter 👍🇺🇸 2 1 Quote Link to comment https://www.bigmacktrucks.com/topic/64155-strange-humming-noise/#findComment-460477 Share on other sites More sharing options...
fjh Posted September 9, 2020 Share Posted September 9, 2020 4 hours ago, staxx said: Check or replace centramax filter 👍🇺🇸 GOOD CALL! Quote Link to comment https://www.bigmacktrucks.com/topic/64155-strange-humming-noise/#findComment-460488 Share on other sites More sharing options...
alex g Posted September 9, 2020 Author Share Posted September 9, 2020 4 hours ago, staxx said: Check or replace centramax filter 👍🇺🇸 I changed oil a couple months ago and the noise started recently. What do I check on centramax filter. Thanks for reply as well Quote Link to comment https://www.bigmacktrucks.com/topic/64155-strange-humming-noise/#findComment-460489 Share on other sites More sharing options...
kscarbel2 Posted September 9, 2020 Share Posted September 9, 2020 20 minutes ago, alex g said: I changed oil a couple months ago and the noise started recently. What do I check on centramax filter. Thanks for reply as well What brand centrifugal filter cartridge did you use at the oil change ? Quote Link to comment https://www.bigmacktrucks.com/topic/64155-strange-humming-noise/#findComment-460491 Share on other sites More sharing options...
alex g Posted September 9, 2020 Author Share Posted September 9, 2020 1 hour ago, kscarbel2 said: What brand centrifugal filter cartridge did you use at the oil change ? Was in a Mack box from dealer but unsure of brand Quote Link to comment https://www.bigmacktrucks.com/topic/64155-strange-humming-noise/#findComment-460510 Share on other sites More sharing options...
kscarbel2 Posted September 9, 2020 Share Posted September 9, 2020 29 minutes ago, alex g said: Was in a Mack box from dealer but unsure of brand Understood. I've no idea who Volvo sources them from now. Quote Link to comment https://www.bigmacktrucks.com/topic/64155-strange-humming-noise/#findComment-460511 Share on other sites More sharing options...
fjh Posted September 10, 2020 Share Posted September 10, 2020 You will hear it wind down when shut down, Quote Link to comment https://www.bigmacktrucks.com/topic/64155-strange-humming-noise/#findComment-460537 Share on other sites More sharing options...
turckster Posted September 10, 2020 Share Posted September 10, 2020 I've heard the oil pumps make that noise on those engines. Some are a little than others. Quote Link to comment https://www.bigmacktrucks.com/topic/64155-strange-humming-noise/#findComment-460543 Share on other sites More sharing options...
alex g Posted September 10, 2020 Author Share Posted September 10, 2020 I'll check centramax filter. If it's the oil pump do they just get noisy or should I replace it? Quote Link to comment https://www.bigmacktrucks.com/topic/64155-strange-humming-noise/#findComment-460546 Share on other sites More sharing options...
mrgumby Posted September 10, 2020 Share Posted September 10, 2020 Got e7 460 that has a hum to it been there since new 400,000 on it and it still hums away I thought it might be the power steering pump humming It’s not really loud but does hum Quote Link to comment https://www.bigmacktrucks.com/topic/64155-strange-humming-noise/#findComment-460552 Share on other sites More sharing options...
turckster Posted September 10, 2020 Share Posted September 10, 2020 5 hours ago, alex g said: I'll check centramax filter. If it's the oil pump do they just get noisy or should I replace it? I had overhauled an E7 some time ago and it had a hum right where the oil pump was located. We contacted Mack reman center and was told to not worry about it, known issue. Since then I have noticed it more often but never seen an oil pressure issue related to the noise. Quote Link to comment https://www.bigmacktrucks.com/topic/64155-strange-humming-noise/#findComment-460573 Share on other sites More sharing options...
alex g Posted September 10, 2020 Author Share Posted September 10, 2020 Ok thanks for all responses. I'll check filter and report back Quote Link to comment https://www.bigmacktrucks.com/topic/64155-strange-humming-noise/#findComment-460574 Share on other sites More sharing options...
fjh Posted September 10, 2020 Share Posted September 10, 2020 Please 2 hours ago, alex g said: Ok thanks for all responses. I'll check filter and report back Please do! Quote Link to comment https://www.bigmacktrucks.com/topic/64155-strange-humming-noise/#findComment-460591 Share on other sites More sharing options...
alex g Posted October 18, 2020 Author Share Posted October 18, 2020 Haven't gotten to the bottom of this problem but I was told yesterday my steering pump which is a Luk brand has issues with bypassing. This could cause the noise. I have to get a pressure gauge on it to see if that's the problem but the place to test it is a couple hours away and until I have work in that direction it can wait. I'll update this when I get to that point. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/64155-strange-humming-noise/#findComment-462628 Share on other sites More sharing options...
Joey Mack Posted December 11, 2020 Share Posted December 11, 2020 just a thought,,,, yes non mack spinners can fail... i witnessed a napa filter explode once,,, i couldnt belive it... anyway, check the spinner spindle... the filter has brass bushings, however,,, these filters spin out grit,,, anyway, like I said, just a thought.. i have only replaced a few metal housings due to spindle wear, usually they are crushed from over tightening and become egg shaped. Merry Christmas.. Jojo 1 Quote Link to comment https://www.bigmacktrucks.com/topic/64155-strange-humming-noise/#findComment-465238 Share on other sites More sharing options...
alex g Posted December 11, 2020 Author Share Posted December 11, 2020 Thanks Jojo I haven't investigated much lately on the problem I've been learning to live with the noise. I'll take a look at the spindle though Quote Link to comment https://www.bigmacktrucks.com/topic/64155-strange-humming-noise/#findComment-465260 Share on other sites More sharing options...
Vmac3 Posted December 16, 2020 Share Posted December 16, 2020 They updated those oil pumps to a high volume type. This was to correct the poor jake brake performance. That humming noise you are taking about is normal. Quote Link to comment https://www.bigmacktrucks.com/topic/64155-strange-humming-noise/#findComment-465545 Share on other sites More sharing options...
alex g Posted December 16, 2020 Author Share Posted December 16, 2020 Thanks. I don't recall it always making the noise though. Quote Link to comment https://www.bigmacktrucks.com/topic/64155-strange-humming-noise/#findComment-465555 Share on other sites More sharing options...
Don Green Posted December 20, 2020 Share Posted December 20, 2020 My AMI 370 makes a noise like that did replace the oil pump and it did quite down some. I saw you were asking on my post of I ever figured it out, truck hasn't been used much for over a year now and I have been in the process of repainting it and going over everything . Will be back on the road next spring. But from what I have learned is it is not uncommon, stoped by a local guys shop that runs macks and he started his up and it sounded like mine,told me it has been making that noise for 200k miles. Guess time will tell,next spring I'm putting it back on the road. Quote Link to comment https://www.bigmacktrucks.com/topic/64155-strange-humming-noise/#findComment-465868 Share on other sites More sharing options...
alex g Posted December 20, 2020 Author Share Posted December 20, 2020 Thanks for responding. I keep a eye on my oil pressure gauge just in case Quote Link to comment https://www.bigmacktrucks.com/topic/64155-strange-humming-noise/#findComment-465871 Share on other sites More sharing options...
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