John Deere 8450 Hydraulic Noise - The Combine Forum
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Old 09-12-2012, 03:35 PM   #1 (permalink)
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Default John Deere 8450 Hydraulic Noise

My new to me JD 8450 has a hydraulic noise when the tractor warms up. The noise goes away when turning the steering wheel or running a scv but returns right after the steering wheel or scv isn't moved.
Checked with previous owner and he said noise has been there for almost ever.
He changed the Relief valve in hydraulic pump and no difference. I have changed both hydraulic filters, oil level is perfect and have had the hydraulics pressures checked and the system checks out.
Any ideas on how to fix this problem?
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Old 09-12-2012, 03:42 PM   #2 (permalink)
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I have also cleaned the sump screen. Tractor starts good, runs, good, hydraulics work good, etc.
The only problem is the hydraulic noise.
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Old 09-18-2012, 01:05 AM   #3 (permalink)
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I've been through this same problem. The cause of the noise is the drive coupling for the hydraulic pump. It will make a noise until the pump is under load. You will need to replace the two coupler pieces and 4 little black plastic insolators. Check with your dealer.
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Old 09-19-2012, 10:16 PM   #4 (permalink)
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i agree most likely spot for noise is in the drive coupler, hope this helps
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Old 09-20-2012, 11:21 AM   #5 (permalink)
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Thanks. For the advice. Already talked to the dealer. Parts are ordered.
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Old 03-21-2014, 11:07 PM   #6 (permalink)
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Changed the coupler and the rubbers and the sound is still there. Seems to go away around 2000 engine rpm but anything under the hydraulic noise is still there. Any more ideas?
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Old 03-22-2014, 01:41 AM   #7 (permalink)
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When you replaced the pump drive flex coupling, was there play between the pump half of the coupler that drives the pump and pump shaft splines

Describe the noise, is it a hollow rattle or is it something more like metal on metal? Possible you have a bad plunger or something in the pump...one of these type of things is nearly impossible to long distance diagnosis
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Old 03-22-2014, 10:40 AM   #8 (permalink)
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Here's a long shot. We had a sp sprayer once that would make noise like you described, we changed numerous things and like you, when turning or high revs, the sound would go away for a short time. Turned out to be a line under cab would touch frame and that vibration would carry into the cab and make a noise that sounded much worse. Line would stiffen and stretch enough to touch frame under the right rpm but would not touch when oil went other places while turning. It was 2 seasons before we spotted the issue by seeing wear marks on the line and frame. May be an idea for you.
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Old 03-23-2014, 09:42 AM   #9 (permalink)
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The noise is a Hydraulic whine that is worse when idling. Starts after the hydraulic oil is warm. There was no play in the splines when replacing the coupling.
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Old 03-23-2014, 10:58 AM   #10 (permalink)
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Hello 8450JD
Sounds like you've checked everything but the pump itself. A hydraulic whine coming from the pump, sounds like the pump to me. Put a stethoscope on it to make sure that it is the source of the whine.
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