Hydrostatic Drive

Symptom Problem Solution

Linkages binding.

Frozen or worn ball joints on linkage.

Lubricate or replace.

Linkage rods bent or interfering.

Adjust at ball joints or straighten.

Control shafts binding.

Lubricate or replace bearings.

Control shaft on pump binding.

See your John Deere dealer.

System overheating. (Warning light comes on.)

Air passages in cooler core plugged.

Clean cooler core.

Fan belt slipping or broken.

Tighten or replace fan belt.

Exceeding relief valve pressure.

Shift to lower gear.

Side screens plugged.

Clean screens.

Picker will not propel forward or reverse 1 .

No voltage to destroker valve on hydro.

Sit squarely on seat. Move hydro lever to Neutral and reset. If still no voltage, see your John Deere dealer.

Transmission inoperative.

Check transmission and linkages or see your dealer.

Low on oil.

Check for leak and correct. Fill reservoir with oil.

Broken coupling from motor to transmission.

Repair as needed.

Air leak in system.

Tighten connections.

Defective U-joint from engine to pump.

Repair as needed.

Plugged oil filter.

Change filter element.

Exceeding relief valve pressure.

Shift to lower gear.

Transmission hard to shift or will not shift.

Hydro lever not in neutral.

Move hydro lever to neutral or adjust hydro linkage.

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

NX,9965,O9A -19-09SEP96-1/2


Symptom Problem Solution

Ground travel speed erratic.

Low on oil.

Check for leaks and correct. Fill reservoir.

Plugged oil filter.

Change filter element.

Exceeding relief valve pressure.

Shift to lower gear.

Hydro lever creeps toward neutral.

Replace friction washers and/or springs as necessary.

Drive systems unable to maintain charge pressure.

See your John Deere dealer.

Picker not responding to hydro lever 1 .

Operator presence system activated.

Bring hydro lever to neutral and try again.

Linkage loose or broken.

Check and repair as needed.

Plugged oil filter.

Change filter element.

Air in system.

Tighten connections, hose clamps, and check for broken hydraulic lines.

Low on oil.

Check for oil leaks and correct. Refill reservoir.

Lack of power or loss of power 1 .

Low on oil.

Check for leaks and correct.

Plugged oil filter.

Change filter element.

Leaking or broken oil line or connection.

Check and repair as necessary.

Drive system unable to maintain or build up pressure.

See your John Deere dealer.

Picker will not start in neutral or will start when hydro lever is in any operational position.

Safety switches out of adjustment, faulty wiring or inoperative switch.

Check wiring connections or see your John Deere dealer.

Transmission leaking oil from breather.

Overfilled transmission.

Drain excess oil.

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

NX,9965,O9A -19-09SEP96-2/2