OMKK36433

Hydrostatic Drive Troubleshooting

Symptom	Problem	Solution
Linkages binding	Frozen or worn ball joints on cable	Lubricate or replace the ball joints.
	Control cable binding	Replace the cable.
	Multi-function lever on pump binding	See your John Deere dealer.

System overheating	Fan belt slipping or broken	Replace the fan belt or the automatic belt tensioner.
	Clogged front and side hood screens	Clean front and side hood screens.
	Low coolant level	Fill up the radiator to the specified level. Check the cooling system for leaks.
	Low hydrostatic/hydraulic oil level	Fill up the reservoir to the specified level. Check the hydrostatic/hydraulic system for leaks.
	Oil cooler system clogged	Clean the oil cooler system.
	Clogged suction strainer	See your John Deere dealer.
	Faulty expansion tank cap	See your John Deere dealer.
	Exceeded relief valve pressure	Shift down one speed range.
	Clogged oil cooler bypass valve	See your John Deere dealer.
	Excessive high-pressure leakage	See your John Deere dealer.
	Charge flush is inadequate	See your John Deere dealer.
	Loop flush is inadequate	See your John Deere dealer.

Sprayer will not travel forward or reverse with multi-function lever in forward or reverse position.¹	Low hydrostatic/hydraulic oil level	Fill up the reservoir to the specified level. Check the hydrostatic/hydraulic system for leaks.
	Clogged hydrostatic oil filters	Replace the hydrostatic oil filters.
	Hydrostatic control cable linkage improperly adjusted	See your John Deere dealer.
	Exceeded limiter pressure	Shift to low speed.
	Broken driveshaft from engine to pump	See your John Deere dealer.
	Air leak in the system	Tighten connections.
	Drive system inoperative	See your John Deere dealer.

Ground travel speed erratic	Radar picking up signals from tall crops	Disconnect radar and use wheel speed sensor.
	Wheel speed sensor faulty	See your John Deere dealer.
	Low hydrostatic/hydraulic oil level	Fill up the reservoir to the specified level. Check the hydrostatic/hydraulic system for leaks.
	Clogged hydrostatic oil filters	Replace the hydrostatic oil filters.
	Exceeding limiter pressure	Shift down one speed range.
	Clogged shift orifice	Could be something wrong inside motor so swash plate angle is not changing. See your John Deere dealer.
	Blown or leaking shift hoses	Repair or replace.
	Drive system unable to maintain charge pressure	See your John Deere dealer.

Sprayer not responding to speed range switch¹	Blown fuse	Replace fuse.
	Low hydrostatic/hydraulic oil level	Fill up the reservoir to the specified level. Check the hydrostatic/hydraulic system for leaks.
	Defective solenoids or switches	Check and repair as needed.
	Clogged hydrostatic oil filters	Replace the hydrostatic oil filters.
	Air in system	Tighten connections, hose clamps, and check for broken hydraulic lines.
	Drive system unable to build up charge pressure.	See your John Deere dealer.
	Faulty hydrostatic motor	See your John Deere dealer.

Lack of power or loss of power.¹	Low hydrostatic/hydraulic oil level	Fill up the reservoir to the specified level. Check the hydrostatic/hydraulic system for leaks.
	Clogged hydrostatic oil filters	Replace the hydrostatic oil filters.
	Leaking or broken oil line or connection	Check and repair as necessary.
	Drive system unable to maintain or build up pressure, or relief pressures incorrectly set	See your John Deere dealer.
	Excessive high-pressure leakage	See your John Deere dealer.

Sprayer will not start in neutral or starts when multi-function lever is in any operational position	Blown fuse	Replace fuse.
	Neutral safety switch out of adjustment, faulty wiring, or inoperative switch	Check wiring connections or (see your John Deere dealer).
	Hydrostatic cable out of adjustment.	See your John Deere dealer.

Wheel motors will not engage	Hydrostatic/hydraulic system out of oil	Fill up the reservoir to the specified level. Check the hydrostatic/hydraulic system for leaks.
	Drive hubs disengaged.	Engage drive hubs.
	Hoses incorrectly connected	See your John Deere dealer.
	Damaged or faulty wheel motors	See your John Deere dealer.
	Damaged or faulty drive hubs	See your John Deere dealer.
	Faulty wheel motor/hub coupling	See your John Deere dealer.

Excessive hydrostatic system noise	Faulty hydrostatic drive pump isolators	Check the hydrostatic drive pump isolators. If there are signs of any damage, looseness or missing bushings, see you John Deere dealer.
	Low hydrostatic/hydraulic oil level	Fill up the reservoir to the specified level. Check the hydrostatic/hydraulic system for leaks.
	Air in system	Tighten connections, hose clamps, and check for broken lines.

¹ When operating in temperatures below -12 degrees C (10 degrees F), run sprayer for 10-15 minutes to warm up hydrostatic drive oil.

TS95756,00004C6-19-20170323