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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

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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 ???

"Be who you are and say what you feel...
Because those that matter...
don't mind...
And those that mind....
don't matter." -

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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

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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 ?

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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

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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

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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.

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  • 1 month later...

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.

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