BarryB
Member
410B steering wheel virtually locked. With force, it will creep but no response at front wheels. Parked it one day, working fine. Next time I went to move it, no steering.
-
Thank you for visiting HeavyEquipmentForums.com! Our objective is to provide industry professionals a place to gather to exchange questions, answers and ideas. We welcome you to register using the "Register" icon at the top of the page. We'd appreciate any help you can offer in spreading the word of our new site. The more members that join, the bigger resource for all to enjoy. Thank you!
Sounds like you have lost pressure. Machine serial number for our resident Deere God?
BarryB
Member
Probable PN of steering valve is AT74315, superseded by AT70269, AT168630 & AT198741 current part.
I have the valve out of the tractor but not apart. There is a check valve in the "pressure in" line, PN AT77488.
The steering wheel will turn a degree or so and then comes up against solid resistance. The "creep" feels like it is because of hydraulic fluid bypassing somewhere in the valve. Early on, I disconnected a line from the actuating cylinder at the axle and this had no effect. I have the tech manuals and have studied the valve schematic and cutaway, with no eureka moment.
I have the valve out of the tractor but not apart. There is a check valve in the "pressure in" line, PN AT77488.
The steering wheel will turn a degree or so and then comes up against solid resistance. The "creep" feels like it is because of hydraulic fluid bypassing somewhere in the valve. Early on, I disconnected a line from the actuating cylinder at the axle and this had no effect. I have the tech manuals and have studied the valve schematic and cutaway, with no eureka moment.
BarryB
Member
TLB serial# 708839; Steering wheel worked the same, virtually locked, engine running or not. Hoe and loader worked normally.
Since last post, I removed the end cap of the steering valve, exposing the "gear-rotor". No debris in there, (following the tech manual). Replaced the end cap and the shaft now turns freely n both directions. Mystery as to what's different! I'm about to go out and install and see what happens now. I'll stay with the thread until it's working and I can relate whatever I've learned.
Since last post, I removed the end cap of the steering valve, exposing the "gear-rotor". No debris in there, (following the tech manual). Replaced the end cap and the shaft now turns freely n both directions. Mystery as to what's different! I'm about to go out and install and see what happens now. I'll stay with the thread until it's working and I can relate whatever I've learned.
BarryB
Member
Put steering valve in place on tractor and hooked up plumbing. Started engine and steering valve would turn some and then be blocked. Appeared that it was purging air. It is clear that it is headed back to the locked up status. Appears that I have been working on the wrong end of the system. Next move is to disconnect both lines to the axle cylinder and see if that changes anything. I did loosen one connection, early on, and it didn't seem to have any effect, but now I'll completely disconnect them and get helper to watch for fluid flow from them when I turn (maybe) the wheel. This procedure isn't addressed in the tech manual. The troubleshooting section essentially says to look for debris in the gear-rotor.
mg2361
Senior Member
Machines in a certain serial number (yours is in that group) had a steering valve that was prone to sticking. They have updated the steering valve internally to address that. With that being said I would not replace it ($1700) until I was sure there wasn't another issue causing your problem. Have you tried steering while raising the loader at the same time to see if your steering returns? Has main pump standby pressure been checked? Tee into the pressure line on the steering valve and check pressure there? Priority pressure been checked?
Still sounds like possible debris. The tolerances inside the spool and sleeve assembly are real tight. Also, has the hydraulic filter been removed and cut open to check for debris?
BarryB
Member
According to Deere Tech manual, TM-1364 (3-86); Diagnostic Information
Diagnose Steering System Malfunctions
Slow or Hard Steering - NA
Excessive Steering Wheel Turns to Steer - NA
Erratic (Spongy) Steering - NA
Steering Wheel "Locks Up" - Debris in Gearoter section - Disassemble and inspect, Flush
[This has been accomplished, no debris observed, gearoter free to turn]
- Priority valve not functioning - Do Priority Valve Test Group 9025-25
- Low Hydraulic flow - Check system pressure and flow
Steering Wheel Turns Freely But No wheel Movement - NA
Poor Centering of Steering Wheel
(Wheels Continue to Move After Steering Wheel is Stopped) - NA
Steering Wheel Oscilates or Turns By Itself After Starting Unit - NA
Diagnose Steering System Malfunctions
Slow or Hard Steering - NA
Excessive Steering Wheel Turns to Steer - NA
Erratic (Spongy) Steering - NA
Steering Wheel "Locks Up" - Debris in Gearoter section - Disassemble and inspect, Flush
[This has been accomplished, no debris observed, gearoter free to turn]
- Priority valve not functioning - Do Priority Valve Test Group 9025-25
- Low Hydraulic flow - Check system pressure and flow
Steering Wheel Turns Freely But No wheel Movement - NA
Poor Centering of Steering Wheel
(Wheels Continue to Move After Steering Wheel is Stopped) - NA
Steering Wheel Oscilates or Turns By Itself After Starting Unit - NA
BarryB
Member
Referring to 9025-05-10; Priority Valve Operation, it appears that the inlet from main pump [diagram (Q)] is common with (E), outlet to steering valve, thus pump pressure should be available at the steering valve.
"Low hydraulic flow" seems unlikely as the hoe and bucket function normally.
"Low hydraulic flow" seems unlikely as the hoe and bucket function normally.
BarryB
Member
Sun. morning- I guess the solution is to "fire" the mechanic.
Yesterday I was searching for the source of a bothersome Hydraulic fluid drip and looked into the "reverser clutch valve" area. [Last winter I had been trying to get a fitting into the forward clutch test port on that valve but couldn't get to it due to a large Hyd. hose in the way. I attempted to disconnect that hose but, due to cold and stiffness of hose (and fingers) I gave , but I had managed to disconnect and cap and plug two 1/4" lines in that area. Unfortunately, I failed to tag this action and, you guessed it, forgot all about it. Turns out, yup, they were the steering lines, so now they are back together and steering is working as advertised. Reverser forward clutch to go, but that's another thread. Many thanks to all who tried to help!
Yesterday I was searching for the source of a bothersome Hydraulic fluid drip and looked into the "reverser clutch valve" area. [Last winter I had been trying to get a fitting into the forward clutch test port on that valve but couldn't get to it due to a large Hyd. hose in the way. I attempted to disconnect that hose but, due to cold and stiffness of hose (and fingers) I gave , but I had managed to disconnect and cap and plug two 1/4" lines in that area. Unfortunately, I failed to tag this action and, you guessed it, forgot all about it. Turns out, yup, they were the steering lines, so now they are back together and steering is working as advertised. Reverser forward clutch to go, but that's another thread. Many thanks to all who tried to help!