1970 cat d6c 10k

I am concerned with steering effort on my d6c, lot of leg pressure to get dozer to turn left or right. have used dozer for about a year this way, time wise probably 125 hrs, have changed all filters twice, cut open trans filter no debris, metal magnet screen under foot plate, clean , no metal have ck steering pump pressure with guage left side reading 245 and rt side 230. I have removed trans/ steering pump , removed pump cover no signs of gear wear, pump cover plate looks good, replaced pump gear shaft bushings reassemble pump and installed, I have same pump pressure as above, I have seen video of steering clutch leakage , I have removed rear cover, raised dozer on stands uned bar to ck cross shaft , no movement, I have no leaks on either side axle seals , I have seen on other post only need 100 psi to release steering clutch and have also seen needs min of 245 psi to release, I am not sure where to start, replace pump to get pressure to 300 or to go into steering clutch compartment to ck steering clutch hub seals , I would greatly appreciate some experienced help thank you keith

Steering clutch pressure should be 275 +/- 25 psi

We went through some steering clutch issues with mine not releasing properly a few years back & managed to get to the bottom of it. It works good now. Maybe this will help some.

https://www.heavyequipmentforums.com/threads/d6c-steering-clutches-not-completely-releasing.45617/

T hank you both for your responces, I retested steering clutch pressure last night, at left side elbow pressure was 240 low idle and 250 high idle rights side pressure 230 low idle and 240 high idle ck pressure in middle port steering valve and pressure 265 at low idle and high idle was 285 , I guess that would be main pump pressure, should that be enough pump pressure from pump supply, If so I must also have leakage at steering clutch hub seals, I removed back cover also last night to look for leak at hubs but side walls do not allow steering clutch hub view, ring gear compartment enclosed, I see steel tubes that apply pressure for clutch release, ,no leaks at steel lines when levers is pulled., I guess a I am asking should I replace pump to try to get to 300 psi or should I go towards hub seals

Checked specs again and found what I gave you was for Direct Drive tractor.
The power shift states 275 psi minimum with steering clutch released.
Pump pressure 275 min - 310 max
Do the blank off test at the elbows to check for steering clutch leakage (fabricate sheet metal blank off plates)
The later 10K's 5984-up spec 315 psi minimum
Pump pressure 315 min - 350 max

Check the pump pressure at the filter housing. early tractor 315 - 275 psi.
Your test results may also show the linkage needs adjusting .
I try to eliminate all the simple stuff first. On flat ground with the transmission in gear when you release both steering clutches does the tractor quit moving?
When you rebuilt your pump did you install the shaft seal with the spring out?
your problem may also be brake related.
All 10K s are powershift.
Bob

have tried to adjust linkage as per service manual, when on flat ground pull both levers back dozer will creep forward , worse when fluid is cold, seal is installed correct in pump

Check your pump pressure, seems like if seal were bad would be worse hot.
I have seen similar problem with rusty or worn splines on drums not allowing clutches to release.
Bob

I checked pump pressure at filter housing last night, engine at operating temp , low idle reading 285 and high idle 315, feel confedent pump is okay, I should do the elbow block off test, with test blocking port I guess I should have same pump reading when pull steering clutch levers, thanks for all your information

Before you start taking things a part If you have 2 gauges hook one up to clutch port and one up to clutch valve port and see what they read when you pull clutch lever . What is your serial #?
Bob

I finally had chance to get pressures, at steering clutch valve center port guage installed and at left side elbow steering clutch at low idle valve pressure is250 and when I pull left steering lever pressure is 235 at both ports and at high idle steering valve port is 270 and when I pull left steering arm pressure is 250 at valve guage and 245 at left elbow port, did not do rt side elbow port pressure comparison, MY serial # is 10k-3438 thank you

It appears your pump pressures are low. Calls for 310-275 .
Did you check pump pressure at filter housing?
Bob

Have you adjusted your brakes lately?

pump pressure at filter is 315 at high idle and and 285 at low idle , I have adjusted brakes , did not make a difference, If I have 315 psi at filter housing and 270 at center port at steering valve where the pressure loss, does fluid flow to trans valve body first and then to steering control valve

There is a adjustable pressure relief valve on front of transmission that has a test port.If you have a local Cat dealer ask them to print you a transmission test and adjust form.
I got to go work on a shovel will be back this afternoon.
Bob

I pushed some mosquite this weekend and I noticed after about 30 minutes of work, the steering clutches will release when pull back on handles and stop when both pulled back , so it does,nt seem bad enough to tear tractor apart. Thanks for all your advice, Keith

Seems like you may have had a little rust in the clutches, still be a good deal to get ahold of a test form and set pressure up to steering clutches.
Good luck
Bob