|
All four tread adjusts do not function.
|
Speed range not in first.
|
Shift to first speed range.
|
|
|
Fuse blown.
|
Replace fuse.
|
|
|
Faulty switch.
|
Replace switch.
|
|
|
Load sense jamming valve not working.
|
See your John Deere dealer.
|
|
|
Engine RPM's set too low.
|
Increase RPM's to 2400.
|
|
|
Low or no hydraulic oil.
|
Fill hydraulic reservoir to correct level.
|
|
|
Lack of or restricted load sense signal due to plugged suction strainer in hydraulic reservoir.
|
Inspect and clean strainer.
|
|
|
Faulty tread adjust valve.
|
See your John Deere dealer.
|
|
|
Faulty hydraulic pump.
|
(See Troubleshooting Of Hydraulic Systems in this section or see your John Deere dealer.)
|
| Symptom |
Problem |
Solution |
|
One individual tread adjust does not function, but others do.
|
Damaged or corroded electrical connection.
|
Repair, replace or clean electrical connection.
|
|
|
Damaged electrical harness.
|
Repair harness.
|
|
|
Faulty solenoid valve.
|
Switch coil with good coil, if function operates, replace coil.
|
|
|
Tread adjust shim pads gap adjustment incorrectly set.
|
Adjust tread adjust shim pads gap correctly. (See Chassis section.)
|
|
|
Knee stuck.
|
Lubricate with graphite spray.
|
|
|
Check valve stuck shut in load sense line.
|
Clean, repair or replace check valve.
|
|
|
Broken, damaged or worn shim pads.
|
See your John Deere dealer.
|
|
|
Plugged orifice in hydraulic line.
|
Replace orifice.
|
|
|
Faulty tread adjust diode.
|
Replace diode.
|
|
|
Faulty tread adjust valve.
|
See your John Deere dealer.
|
|
|
Faulty tread adjust cylinder.
|
See your John Deere dealer.
|
|
One individual tread adjust does not stop when switch is released.
|
Sticking or faulty switch.
|
Replace switch.
|
|
|
Sticking hydraulic spool.
|
Clean repair or replace.
|
|
|
Faulty solenoid valve.
|
Repair or replace solenoid valve.
|
|
Excessive front tire wear or poor row tracking.
|
Improper toe-angle adjustment.
|
Adjust toe angle.
|