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John Deere 3120, 3320, 3520, 3720 - Service Transmission
John Deere 3120, 3320, 3520, 3720 Tractor Front Axle
Checking Front Axle Oil Level
Allow John Deere 3120, 3320, 3520, 3720
tractor to cool down for at least one hour. Dirt and debris in oil may
cause damage to the transaxle. Clean area around opening before removing
dipstick. Loosen and remove dipstick located on right side of front
axle. Wipe dipstick clean with a rag. Install and tighten dipstick.
Remove dipstick again. Oil level should be indicated on the dipstick,
but not above the full line. If oil level is low: Add recommended
oil through dipstick fill opening until oil level is correct. Install
and tighten dipstick. Check front axle oil level again after the first
several hours of operation.
Changing Front Axle Oil
Operate JD 3120, 3320, 3520, 3720 tractor to
warm front axle oil. Park machine safely. Position drain pan under
differential drain plug. The front axle contains approximately 5.0 L
(1.3 gal) of oil. Remove differential drain plug and allow oil to drain.
Position drain pan under axle drain plug on both sides of front
axle. Remove axle drain plugs and allow oil to drain. Install and
tighten all three drain plugs after all oil has drained. Remove dipstick
located on right side of front axle. Add approximately 5.0L (1.3
gal) of recommended oil into dipstick filler opening. Install and
tighten dipstick. Check front axle oil level.
Adjusting Front Axle Thrust Bolt Torque
Adjust bolt torque at the
required service interval to prevent excessive forward and rearward
movement of the front axle. Raise front axle off ground to take machine
weight off the front axle. Loosen jam nut. Tighten bolt to 32 Nm
(24 lb-ft). Do not overtighten. Tighten back the jam nut. Lower front
axle back to ground.
John Deere 3120, 3320, 3520, 3720 Tractor Transmission
Checking Transmission Oil Level
Allow machine to cool down for at
least one hour. Remove dipstick located behind operator’s seat. Wipe
dipstick with a clean rag. Install dipstick. Remove dipstick and check
oil level. Oil level should be between the minimum and maximum lines. Clean area around fill cap before removing. Do not overfill
transmission. Oil expands during operation and could overflow. If oil
level is low: Remove oil fill cap. Add recommended oil at fill cap
location. Install and tighten fill cap.
Changing Transmission Oil and Hydraulic Suction Oil Filter
Run John
Deere 3120, 3320, 3520, 3720 engine a few minutes to warm the
transmission oil. Position drain pan under transmission drain plug and suction filter assembly on left side of transmission. Remove plug
and allow oil to drain. Remove cover and allow oil to drain. Remove
filter assembly and replace with new filter assembly. Install cover.
Install transmission drain plug. The inline hydraulic filter should be
cleaned at the same time the transmission oil is changed, but not every
time. Clean inline hydraulic filter: Position drain pan under filter. Remove filter from lines. Remove nut with internal element from
case. Clean case and internal element with a mild solvent. Allow to dry.
Direction-of-flow arrow on filter points toward transmission fitting.
Assemble and install hydraulic filter assembly. Remove fill cap. Add
recommended oil into filler opening. Start engine. Check for oil leaks
around filter base and drain plugs. Stop engine. Check transmission oil
level.
John Deere 3120, 3320, 3520, 3720 Tractor with PowrReverser Transmission
The range shift lever provides
three speed ranges. The gear shift lever provides four gear positions.
The reverser lever controls travel direction. Use all three levers in
different combinations to achieve twelve forward and twelve reverse
speeds. Machine motion must stop and the clutch pedal must be depressed
before changing ranges. Gears may be changed while machine is in motion
if clutch pedal is completely depressed. Select the proper speed range
and gear for the job: Never overload engine by lugging machine at low
idle speeds. Raise engine speed to match expected loads. If a slight
increase in engine rpm occurs simultaneously with moving hand throttle
lever forward, the engine is not overloaded. Choose a speed range to
match work application: Low speed/high power operations such as tilling
hard soil, mowing high grass or positioning backhoe. Operations
including moderate tilling, hauling, and grass mowing. High speed
operations such as transport and light mowing. Choose a gear that
matches the immediate power/speed requirements: 1st Gear – High power,
low speed operations. 2nd Gear – Medium power, moderate speed
operations. 3rd Gear – Low power, moderate speed operations. 4th Gear –
Low power, high speed operations.
Driving Machine (PowrReverser)
Start JD 3120, 3320, 3520, 3720 engine.
Move reverser lever to neutral position. Unlock park brake. Depress
clutch pedal completely. Choose speed range on transmission
range shift lever to match work application. Move the transmission gear
shift lever to the desired gear position. Move the reverser lever to the
forward or reverse position. Release clutch pedal gradually to take up
load smoothly. Continue to shift gears while moving under normal loads:
Depress clutch pedal completely and shift to next gear. Release clutch
pedal gradually to take up load smoothly. Adjust throttle speed: To
maintain a constant operating speed, adjust the engine speed with the
hand throttle lever. To repeatedly increase and decrease engine speed,
leave the hand throttle lever set at the middle position and use the
foot throttle to change engine speed. To change travel direction: Clutch
use is not required. Move the reverser lever to the forward or reverse
position.
John Deere 3120, 3320, 3520, 3720 Tractor with Hydro Transmission
The range shift lever provides three
speed ranges. The range shift lever is used in conjunction with the
forward and reverse travel pedals. Select the proper speed range and
gear for the job: Never overload engine by lugging machine at low idle
speeds. Raise engine speed to match expected loads. If a slight increase
in engine rpm occurs simultaneously with moving hand throttle lever
forward, the engine is not overloaded. Choose a speed range to match
work application. Low speed/high power operations such as tilling hard
soil, mowing high grass or positioning backhoe. Operations including
moderate tilling, hauling, and grass mowing. High speed operations such
as transport and light mowing.
Driving Machine (eHydro)
Start machine engine. Unlock park brake. Choose speed range on transmission range shift lever to match work application. Move hand throttle lever to desired operating speed. Slowly depress forward pedal downward to travel forward. Slowly depress reverse pedal downward to travel in reverse. The farther either travel pedal is depressed, the faster the machine will travel. Release travel pedal to stop machine and change speed range. Fully stop machine motion before turning off ignition.
- 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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