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John Deere 3120, 3320, 3520, 3720 - Troubleshooting and Error Codes
JD 3120, 3320, 3520, 3720 Engine
1) Engine Will Not Crank - PowrReverser: Transmission gear shift lever
not in neutral position. PTO engaged. Battery low on charge. Blown fuse.
Electrical problem.
2) Engine Will Not Start - Wrong engine oil viscosity. Engine hand
throttle lever not pushed forward. Cold start system not being used, or
malfunctioning. Stale fuel / improper fuel / fuel level. Plugged fuel
filter. Dirty or faulty fuel injectors. Failed fuel solenoid.
3) Engine Runs Rough Or Stalls - Engine hand throttle lever not pushed
forward. Plugged fuel filter. Plugged air intake system. Fuel cap vent
dirty. Faulty seat switch. Stale or improper fuel / fuel level / water
in fuel. Dirty or faulty fuel injectors. Low coolant temperature. Fuel
pump not functioning properly.
4) Engine Knocks - Engine oil level low. Low coolant temperature. Engine
overheating. Idle speed too slow. Faulty cold advance device.
5) John Deere 3120, 3320, 3520, 3720 Engine Overheats - Low coolant
level. Cooling system needs flushing. Defective radiator cap. Defective
thermostat. Defective water temperature indicator or sender. Low oil
level. Loose or defective alternator belt. Do not operate at slow idle,
operate at fast idle. Dirty grille, radiator screen, or radiator cooling
fins. Operating at too fast ground speed for conditions.
6) Engine Lacks Power - Brakes dragging. Misadjusted rockshaft feedback
linkage. Improper type of fuel. Plugged air intake system. Plugged fuel
filter. Engine overheating. Operating at too fast ground speed for
conditions. Engine oil viscosity too high. Low coolant temperature.
Dirty or faulty fuel injectors. Dirty intercooler fins. Implement
improperly adjusted. See implement operator’s manual. Improper ballast -
adjust load. Rockshaft stop valve closed. Turbo housing hose leaks.
7) Low Oil Pressure - Engine oil level low. Plugged oil filter. Improper
type of oil. Faulty pressure regulating valve.
8) Engine Uses Too Much Oil - Find and correct oil leaks. Incorrect
engine oil. Plugged air intake filter.
9) Engine Emits White Smoke - Improper type of fuel. Low engine
temperature. Defective thermostat. Faulty cold advance device.
10) Engine Emits Black Or Gray Exhaust Smoke - Improper type of fuel.
Plugged air intake system. Operating at too fast ground speed for
conditions. Dirty or faulty fuel injectors. Dirty intercooler fins.
11) High Fuel Consumption - Improper type of fuel. Plugged air intake
system. Operating at too fast ground speed for conditions. Dirty or
faulty fuel injectors. Implement improperly adjusted, causing drag on
machine. See implement operator’s manual. Plugged crankcase vent tube or
baffle. Brakes dragging.
John Deere 3120, 3320, 3520, 3720 Electrical System
1) Battery Will Not Charge - Loose or corroded connections. Defective
battery. Dead cell in battery. Loose or defective alternator belt.
Defective alternator. Check 3 pin connector on alternator is plugged in
properly.
2) Battery Discharge Indicator Stays On With Engine Running - Low engine
speed. Defective battery. Defective alternator. Loose or defective
alternator belt. Check 3 pin connector on alternator is plugged in
properly.
3) Starter Will Not Work - Loose or corroded battery connections. Blown
fuse. Starter solenoid connector pulled off or corroded. Low battery
power. Neutral start switch faulty. Key switch or starter faulty.
PowrReverser: Transmission gear shift lever not in proper position. PTO
engaged or faulty switch. Neutral start switch jumper defective (eHydro
only).
4) Starter Turns Slowly - Low battery power - charge battery. Engine oil
viscosity too heavy. Loose or corroded battery connections.
5) Cab Window wiper(s) and washer will not run - Blown fuse. Faulty
wiring or loose connections. Defective switch(es). Defective motor(s).
Cab Work lights do not work - Blown fuse. Faulty wiring or loose
connections. Defective bulb or switch. Replace bulb.
6) Cab Dome light does not work - Blown fuse. Faulty wiring or loose
connections. Defective bulb or switch. Replace bulb. Defective door
switch(es).
John Deere 3120, 3320, 3520, 3720 Heater and Air Conditioning System
1) All cab electrical switches do not work - Loose, defective or blown
fusible link.
2) Blower malfunctioning - Blown fuses. Blower does not work.
3) Blower operates only in high position - One of two fuses blown. Blown
blower resistance assembly.
4) Heater does not work - Low coolant level. Check coolant level; add if
necessary. Faulty thermostat. Heater control valve not functioning
properly. Heater core or hoses clogged or damaged. Flush cooling system.
Replace heater core or hoses.
5) Air conditioning does not work - Blown fuse. Faulty wiring or loose
connections. Fan belt loose or slipping. Defective switch. Defective
compressor clutch.
6) Drafts - Poor air distribution. Adjust directional air louvers. Set
blower switch to medium or low positions.
7) Inadequate air flow - Clogged air filters. Evaporator core air flow
restricted. Faulty blower fan motors. Defective blower switch. Faulty
wiring or loose connections.
8) Water leaking or dripping from evaporator core compartment - Loose
hose clamp. Evaporator condenser pan dirty. A/C drain tubes plugged.
9) Strange odors inside operator’s cab - Dirty air filters. Evaporator
condenser pan dirty. A/C drain tubes plugged. Tobacco smoke and tar on
evaporator exterior.
10) Partial frosting and sweating of lines combined with poor cooling -
Fan belt slipping. Loss of refrigerant. Restricted or clogged liquid
line. Expansion valve malfunctioning.
11) Ice flecks blowing from evaporator - Control dial set too low.
Adjust temperature control to a warmer position.
12) Failure to cool - Insufficient blower speed. Dirty air filters.
Debris on front grille. Lint or dirt on condenser fins. Refrigerant is
lost or extremely low. Loose fan belt. Compressor clutch not engaging.
Expansion valve not functioning. Restriction in refrigerant system.
Faulty wiring or loose connections. Defective temperature control
switch. Outside temperature too low, below 21gets warmer. Condenser is
overheating. Clean condenser screens, cores and fins of condenser and
radiator. Severe restriction in high side. Burned out clutch field or
faulty field. Short circuit in control circuit or failure of a switch in
circuit.
13) Hissing noise at expansion valve - Loss of refrigerant. Restriction
in refrigerant system. Check receiver-dryer for uniformity of
temperature.
JD 3120, 3320, 3520, 3720 Machine
1) Operation Sluggish, Slow - Suction side filter may need replacement.
2) Poor Hydraulic Performance - Suction side filter may need
replacement. Water in oil.
3) Excessive Machine Vibration - Engine speed too slow. Throttle linkage
out of adjustment.
4) Machine Will Not Move With Engine Running - Electrical problems.
Operator pushing down both travel pedals at same time. Park brake
locked. Transmission oil level low. Transmission oil cold - allow engine
to warm. Transmission range shift lever in neutral position. Suction
side filter may need replacement. Operator not in seat.
5) 3-point Hitch Fails To Lift - Low oil level. Worn hydraulic pump.
Rate of drop valve closed. Excessive load on hitch. Hydraulic oil too
cold. Hydraulic oil suction filter plugged.
6) 3-point Hitch Lifts Slowly - Suction side filter may need
replacement. Worn hydraulic pump.
7) 3-point Hitch Drops Slowly Or Does Not Drop - Rate-of-drop valve
closed. Rate-of-drop valve set too slowly.
8) 3-point Hitch Drops Too Fast - Rate-of-drop set too fast. Load too
heavy.
Steering and Brakes
1) Rear Wheel Brakes Not Working - Brakes out of adjustment. Worn or
damaged brake linkage.
2) Steering Not Working - Hydraulic suction filter plugged. Improper
tire inflation. Steering linkage needs lubrication. Excessive play in
steering.
JD 3120, 3320, 3520, 3720 Error Codes
Err 01 - Forward and reverse pedals. Both pedals are
depressed. Machine does not drive. Release both pedals and depress one
at a time.
Err 02 - Forward Pedal. Voltage signal out-of-range or
not calibrated. Machine does not drive.
Err 03 - Reverse Pedal. Voltage signal out-of-range or
not calibrated. Machine does not drive.
Err 04 - Engine Speed. No signal at Engine Speed input.
No anti-stall or cruise functions; Loss of performance.
Err 05 - Brake and Cruise Set/Decel Switch. Cruise
control Set/Decel switch depressed while brake is engaged. No cruise
function. Release brake pedal.
Err 06 - MFWD Speed. No signal at MFWD speed input. No
cruise function; Loss of performance.
Err 07 - Cruise Set/Decel Switch. Cruise Set/Decel
switch is held or stuck on. No cruise function.
Err 08 - Throttle Sensor. Voltage signal out-of-range
or not calibrated. No anti-stall function; Loss of performance.
Err 09 - Cruise On/Off and Set Max Speed switches.
Cruise and Max Speed inputs are both active. No cruise function.
Err 11 - Cruise Set/Decel and Cruise Res/Accel
switches. Set/Decel and Resume/Accel switches are both active. No cruise
function.
Err 12 - Sensor Supply voltage. Voltage is
out-of-range. Machine does not drive.
Err 14 - Pump Current. Coil resistance too high (open)
or too low (short). Machine does not drive.
Err 15 - Operator Present. Operator not in the seat.
Machine does not drive. Return back to the seat.
Err 57 - HST Timeout. No response from HST controller.
Loss of features.
Err 60 - Right Red Lamp ON. Output from the Display is
short circuit. No right turn signal on the ROPS. Check the right red
lamp.
Err 61 - Right Red Lamp OFF. Output from the Display is
open. No right turn signal on the ROPS. Check the right red lamp.
Err 62 - Left Red Lamp ON. Output from the Display is
short circuit. No left turn signal on the ROPS. Check the left red lamp.
Err 63 - Left Red Lamp OFF. Output from the Display is
open. No left turn signal on the ROPS. Check the left red lamp.
Err 64 - Right Amber Lamp ON. Output from the Display
is short circuit. No right hazard signal on the ROPS.
Err 65 - Right Amber Lamp OFF. Output from the Display
is open. No right hazard signal on the ROPS. Check the right amber lamp.
Err 66 - Left Amber Lamp ON. Output from the Display is
short circuit. No left hazard signal on the ROPS. Check the left amber
lamp.
Err 67 - Left Amber Lamp OFF. Output from the Display
is open. No left hazard signal on the ROPS. Check the left amber lamp.
Err 68 - Hold-in Relay ON. Output from the Display is
short circuit. No fuel to the engine.
Err 69 - Hold-in Relay OFF. Output from the Display is
open. No fuel to the engine.
Err 70 - Starter Relay ON. Output from the Display is
short circuit. Can not crank the engine.
Err 71 - Starter Relay OFF. Output from the Display is
open. Can not crank the engine.
Err 72 - Display Mode Switch. The LCD Display
Mode/Configuration input is stuck on. No other info selectable; No HST
commands selectable.
- JD 3120, 3320, 3520, 3720 Engine
- JD 3120, 3320, 3520, 3720 Transmission
- JD 3120, 3320, 3520, 3720 PTO
- JD 3120, 3320, 3520, 3720 Brakes and Wheels
- JD 3120, 3320, 3520, 3720 Hydraulic and Hitch
- JD 3120, 3320, 3520, 3720 Operating
- JD 3120, 3320, 3520, 3720 Troubleshooting
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