|
All four tread adjusts do not function.
|
Load sense jamming valve not working.
|
See your John Deere dealer.
|
|
|
Speed range switch not in first.
|
Shift speed switch to first range.
|
|
|
Engine RPM's set too low.
|
Increase RPM's to 2600.
|
|
|
Fuse blown.
|
Replace fuse.
|
|
|
Faulty switch.
|
Replace switch.
|
|
|
Low or no hydraulic oil.
|
Fill hydraulic reservoir to correct level.
|
|
|
Faulty hydraulic pump.
|
See Troubleshooting of Hydraulic Systems in this section or see your John Deere dealer.
|
|
|
Lack of or restricted load sense signal due to plugged suction strainer in reservoir.
|
Inspect and clean strainer.
|
|
|
Faulty tread adjust valve.
|
See your John Deere dealer.
|
|
|
Load sense jamming valve not working.
|
See your John Deere dealer.
|
| Symptom |
Problem |
Solution |
|
One individual tread adjust does not function, but others do.
|
Tread adjust shim pads gap adjustment incorrectly set.
|
Set tread adjust shim pads gap adjustment correctly. (See Chassis section in this manual.)
|
|
|
Check valve in load sense line stuck shut.
|
Clean, repair or replace check valve.
|
|
|
Plugged orifice in hydraulic line.
|
Replace orifice.
|
|
|
Faulty solenoid valve.
|
Switch coil with good coil, if function operates, replace coil.
|
|
|
Damaged electrical harness.
|
Repair harness.
|
|
|
Broken, damaged or worn shim pads.
|
See your John Deere dealer.
|
|
|
Damaged or corroded electrical connection.
|
Repair, replace or clean electrical connection.
|
|
|
Faulty tread adjust cylinder.
|
See your John Deere dealer.
|
|
|
Faulty tread adjust diode.
|
Replace diode.
|
|
|
Faulty tread adjust valve.
|
See your John Deere dealer.
|
|
One individual tread adjust does not stop when switch is released.
|
Faulty solenoid valve.
|
Repair or replace solenoid valve.
|
|
|
Sticking or faulty switch.
|
Replace switch.
|
|
|
Sticking hydraulic spool.
|
Clean repair or replace.
|
|
Excessive front tire wear or poor row tracking.
|
Improper toe-angle adjustment.
|
Adjust toe angle.
|