OMHXE51478

Hydrostatic Ground Drive

Symptom	Problem	Solution
Speed Range Selector Will Not Go in Reverse (Non ProDrive Machines).	Bent or broken parts in control linkage.	Repair or replace as required.

Linkages Binding (Non ProDrive Machines).	Frozen or worn ball joints on control cable.	Lubricate or replace.
	Bell crank or pivots binding.	Lubricate or replace.
	Control cable kinked or frozen.	Replace if needed.

System Overheats.	Oil cooler or radiator plugged.	Blow air through core and clean.
	Lack of charge oil flow.	See your John Deere dealer.
	Engine fan belt slipping or broken.	Check for worn or broken belt.
	Plugged oil filter.	Change filter.
	Exceeding relief valve pressure.	Shift to lower gear.
	Relief valve stuck closed.	See your John Deere dealer.
	By-pass valve fails to close.	See your John Deere dealer.

High Oil Loss.	Loose connections or leaking hydraulic lines, hoses, or O-rings.	Tighten connections or replace damaged lines, hoses, or O-rings.
	Oil leaking into power take-off gearbox (Non ProDrive Machines).	Replace hydrostatic pump shaft seal.
	Oil leaking into power take-off gearbox (ProDrive Machines).	Replace hydrostatic motor shaft seal or park brake seals in transmission, see your John Deere dealer.
	Worn or damaged triple pump seals (Non ProDrive Machines).	Check triple pump cavities between valve stack pump and steering pump. Both pump cavities should contain no oil. If oil is found between pump cavities sections, replace pump shaft seals on valve stack pump and steering pump before replacing both pumps.
	Worn or damaged quad pump seals (ProDrive Machines).	Check quad pump cavities between valve stack pump and ProDrive lube supply pump. Both pump cavities should contain no oil. If oil is found between pump cavities sections, replace pump shaft seals on valve stack pump and ProDrive lube pump before replacing both pumps.

Machine Will Not Move Forward or Reverse.	Transmission out of gear (Non ProDrive Machines).	Shift transmission.
	System detects ground drive faults (ProDrive Machines).	See your John Deere dealer.
	Low on oil.	Check for leaks and correct. Fill reservoir.
	Air leak in system.	Tighten connections.
	Control linkages broken or loose (Non ProDrive Machines).	Tighten loose linkages or replace as needed.
	Lack of charge flow or charge pressure.	See your John Deere dealer.
	Plugged filter.	Change filter.
	Exceeding maximum operating pressure setting (Non ProDrive Machines).	Shift to lower gear.
	Exceeding maximum operating pressure setting (ProDrive Machines).	See your John Deere dealer.
	Drive system unable to build up pressure.	See your John Deere dealer.
	Relief valve open.	See your John Deere dealer.

Ground Travel Speed Erratic.	Low oil.	Check for leaks and correct. Fill reservoir.
	Plugged filter.	Change hydrostatic charge filter.
	Exceeding maximum operating pressure setting (Non ProDrive Machines).	Shift to lower gear or engage four-wheel drive.
	Exceeding maximum operating pressure setting (ProDrive Machines).	See your John Deere dealer.
	Multi-function lever creeps toward neutral.	See your John Deere dealer.
	System unable to keep charge pressure.	See your John Deere dealer.

Machine Will Not Stop When Speed Range Selector is in Neutral Position (Non ProDrive Machines).

Control cable out of adjustment.

Adjust cable for neutral position.

Lack of Power or Lost Power. Machine Not Responding to Speed Range Selector.	Low on oil.	Check for leaks and correct. Fill reservoir.
	Plugged filter.	Change hydrostatic charge filter.
	Lack of charge flow or charge pressure.	See your John Deere dealer.
	Dirty fuel filter.	Replace fuel filter.
	Water in separator bowl.	Drain water from separator bowl.
	Drive system unable to keep or build up pressure.	See your John Deere dealer.
	System detects ground drive faults.	See your John Deere dealer.

OUO6075,0001006-19-20120213