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strange noise after stopping. fiat 645b
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bjorn tore View Drop Down
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Joined: 04 Mar 2022
Location: Norway
Points: 7 		Post Options Post Options   Thanks (0) Thanks(0)   Quote bjorn tore Quote  Post ReplyReply Direct Link To This Post Topic: strange noise after stopping. fiat 645b
    Posted: 23 Mar 2023 at 11:18am
I have an Fiat allis 645b wheel loader.  I have been refilling some hydraulic oil because it was low on oil and it seemed like i had some air in the system.  But after refilling this it seems like the hydraulics works fine now. But after i stop the wheel loader i hear a whistle sound, its sounds like a tire that has a leak.  the sound comes from right under the cabin near the hydraulic pump. it disapears again 5 min after stop. Cant see any oil drops either underneath.  
Does anybody know what this problem is ? 


Edited by bjorn tore - 23 Mar 2023 at 11:19am
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darrel in ND View Drop Down
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Joined: 22 Nov 2009
Location: Hebron, ND
Points: 8688 		Post Options Post Options   Thanks (0) Thanks(0)   Quote darrel in ND Quote  Post ReplyReply Direct Link To This Post Posted: 23 Mar 2023 at 11:20am
Pretty sure it has a compressor/air system for the brakes (both of mine do) so quite likely you're hearing an air leak from that.
Darrel
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steve(ill) View Drop Down
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Joined: 11 Sep 2009
Location: illinois
Points: 85906 		Post Options Post Options   Thanks (0) Thanks(0)   Quote steve(ill) Quote  Post ReplyReply Direct Link To This Post Posted: 23 Mar 2023 at 12:15pm
in addition to what Darrel said... i think the air brakes might bleed off and LOCK when the tractor is OFF... You start the motor and let it build up air pressure to RELEASE the brakes ?
Like them all, but love the "B"s.
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SteveM C/IL View Drop Down
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Joined: 12 Sep 2009
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Points: 8509 		Post Options Post Options   Thanks (0) Thanks(0)   Quote SteveM C/IL Quote  Post ReplyReply Direct Link To This Post Posted: 25 Mar 2023 at 9:52am
My 78 545B has air over hyd brakes. No air-no brakes. Has a drum parking brake on driveshaft with the over center lever. Mine has a dual air tank near the hyd pump with petcock drains as well as a large tank in the rt rear corner. Could be similar. I would pursue air leaks first.
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