OMKK36433

Tread Adjust System Troubleshooting

Symptom	Problem	Solution
Tread adjusts are not functioning	Speed is not in the first range	Shift to first speed range.
	Blown fuse	Replace fuse.
	Faulty switch	Replace switch.
	Low engine rpm	Increase rpm to 2400.
	Low hydrostatic/hydraulic oil level	Fill up the reservoir to the specified level. Check the system for leaks.
	Faulty tread adjust valve	See your John Deere dealer.
	Faulty hydraulic pump	See Hydraulic System Troubleshooting in this Section or see your John Deere dealer.

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	Replace the coil or see your John Deere dealer.
	Loose shim on axle tread	Properly adjust the shim gap on axle tread.
	Stuck knee	Lubricate with graphite spray.
	Check stuck valve in the load sense line	Clean, repair, or replace the valve.
	Broken, damaged, or worn shim pads	See your John Deere dealer.
	Clogged orifice in the hydraulic line	Replace the orifice.
	Faulty tread adjust diode	Replace the 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 the switch is released	Sticking, or faulty switch	Replace the 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 front axle toe-in adjustment

Adjust the front axle toe-in.

TS95756,00004CF-19-20170327