4430 hyd oil temp

johnyquest69 · Aug 18, 2016

All,

I checked some temps on SCV's today and had 220 degrees. This seems hot from what I've read. I've checked test ports on this tractor and things seem to be in range. I have a leak in the front pump and have recently replaced the stroke control valve because I lost lift and scv control. Can't seem to stop a leak on clamp on steering return line and wondering if I may have a pressure leak here? I have had steering issues in the past, but somehow managed to clear it by cleaning filter in the brick. any thoughts/

Bob · Aug 18, 2016

With the tractor cooled to ambient temp start it up and (safely) feel all the hydraulic valves and components (better yet, use an infra-red thermometer) and note which component(s) begin to heat up first, which indicates a high pressure leak in that area.

A properly functioning closed-center system doesn't flow any oil unless a function is being used or there's a defective component/internal leak which causes oil heating.

Tx Jim · Aug 19, 2016

Ditto what Bob stated.

buickanddeere · Aug 19, 2016

Is there a cold weather hydraulic oil warming bypass on that tractor ?

DONMYEIL · Aug 20, 2016

I might add that a rule of thumb on hyd. oil temp is 100 degrees above outside temp. Check oil cooler for air flow .

johnyquest69 · Aug 20, 2016

I tried checking some temps with infrared thermo today. Looks like my pressure control valve and steering valve are heating up the quickest. I checked yesterday after baling about 40 bales and was running about 215 degrees all over. I guess that why we need to check after startup. Once it heats up its going to be that temp throughout. PCV and steering were about 20 to 30 degrees above everywhere else I checked after 20 minutes from startup. Thoughts?

Tx Jim · Aug 20, 2016

Sounds as is steering is leaking. Is your tractors serial number below or above 027634 as there was a steering control change at this SN.

johnyquest69 · Aug 22, 2016

Mine is above. I stopped and talked to another mechanic yesterday. he was questioning my scv's. I told him my valve on bottom of steering column and pressure control valve seem to heat up the quickest. I did tell him when I check scv with gauge, my pressure goes to around 2100# and then falls to nothing when I return lever to neutral. He said it should not do this and this could be my problem???

Tx Jim · Aug 22, 2016

(quoted from post at 12:46:29 08/22/16) I did tell him when I check scv with gauge, my pressure goes to around 2100# and then falls to nothing when I return lever to neutral. He said it should not do this and this could be my problem???

Ditto on scv should hold pressure when control handle returned to neutral.

Your tractor has metering pump steering. Check temp of hyd valve that resembles a brick that's in frt of firewall under the hood.

johnyquest69 · Aug 22, 2016

Will do and reply back. Thanks!

johnyquest69 · Aug 22, 2016

So I checked brick today when I got in. Did seem to be heating up faster than other areas. Checked scv's again and both sides were dropping pressure when returned to neutral. One side seemed to heat up faster than the other. Just paid $700 to have one side valves put in but not new barrels. I know they were not adjusted. Do I start with the brick? Thanks for your time!

Tx Jim · Aug 23, 2016

Installing new poppet valves in scv without adjusting valve clearance is a waste of time & $$$$$. After scv's are correctly repaired if tractor still had hyd oil heating problem I would disassemble hyd valve and check balls/seats.

4430 hyd oil temp

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