Hydraulic System
| Symptom | Problem | Solution |
|
All hydraulic system fails to function.
| Bad fuse. |
Replace fuse.
|
| |
Low oil supply.
|
Fill oil to correct
fill specification. (See Check Hydraulic Oil Level—Daily in
Lubrication and Maintenance section.)
|
| |
Engine rpm set too low.
|
Run engine at fast idle.
|
| |
Clogged suction line.
|
Clean line.
|
| |
Damaged pump drive coupling.
|
Replace coupling.
|
| |
Pump faulty.
|
Replace pump.
|
|
System overheating in cold weather.
| When operating machine in low ambient temperatures below
-7°C (20°F), the hydraulic oil may overheat due to a restriction
at the hydraulic oil cooler. |
Install winter screens
to hydraulic coolers to maintain correct temperature.
|
|
Oil escapes at breather in reservoir cap.
| Reservoir over-filled. |
Reduce oil to correct
fill specification. (See Check Hydraulic Oil Level—Daily in
Lubrication and Maintenance section.)
|
| |
Excessive speed on rough terrain.
|
Select slower target
speed.
|
| |
Driving on steep slopes.
|
Stay off slopes to steep
for operation.
|
|
Booms level or fold too fast.
| Incorrect orifice, or none in work port. |
Use correct orifices,
properly installed. (See your John Deere dealer.)
|
|
Lift arms drop too fast.
| Incorrect orifice, or none in boom valve. |
Use correct orifices,
properly installed. (See your John Deere dealer.)
|
|
Booms fold too slow.
| Plugged orifice. |
Remove orifice, clean,
and reinstall.
|
| |
Incorrect orifice.
|
Install correct orifice.
(See your John Deere dealer.)
|
|
Some functions work erratically or not at all.
| Low oil. |
Fill tank to proper
level.
|
| |
Loose or disconnected wires at switch or solenoid.
|
Check and repair connections.
|
| |
Failed solenoid coil.
|
Replace coil.
|
|
Erratic steering.
| Hydraulic oil overheated. |
Fill tank to proper
level.
Clean oil cooler and
screens.
|
| |
Pump faulty.
|
Replace pump.
|
| |
AutoTrac slow to acquire line or sluggish response.
|
Clean AutoTrac strainer.
(See Clean AutoTrac Strainer—As Required in Lubrication and
Maintenance section.)
|
|
All hydraulic functions but one do not work or are slow.
| Check valve stuck open in load sense line of function
that works properly. |
Clean or replace check
valve or (see your John Deere dealer).
|
|
Sluggish or slow rate control, cannot meet speed or pressure
requirements, must drive at too low of speed.
| Plugged hydraulic compensator strainer. |
Remove, inspect, and
clean strainer. (See your John Deere dealer.)
|
|
One hydraulic function fails to work properly.
| Bad fuse. |
Replace.
|
| |
Bad switch.
|
Repair or replace.
|
| |
Check valve sticks shut in load sense line of hydraulic
valve.
|
Clean or replace check
valve.
|
| |
Solenoid or hydraulic function faulty.
|
Repair or replace.
|
| |
Hydraulic spool not shifting properly.
|
Clean or replace or
(see your John Deere dealer).
|
|
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OUO6092,0000972-19-20150316
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