Tractor reference
John Deere 4066M
Specifications, maintenance, parts and compatibility reference.
Specification set: United States - 4WD 4M base-price configuration Official North America configuration from the John Deere compact utility tractor price book published 5 May 2026.
Machine Configuration
Drive type4WD
Engine
Engine manufacturerYanmar
Rated engine power65.9 hp
Engine displacement2.1 L
Cylinders4
Rated engine speed2600 rpm
AspirationIntercooled turbocharged
EmissionsTier IV EPA emissions certified
Transmission
Standard transmissioneHydro, in base price
Transmission options12F/12R PowrReverser factory option
PTO
PTO power52 hp
Hydraulics
Base hydraulic configurationHydraulics not included in base machine
Electrical
Electrical system12 V
Alternator75 A
Battery770 CCA
Maintenance schedule
Intervals are tied to the cited John Deere guide. Operating conditions and serial-number ranges can change the required service.
EngineChange engine oilTY26669 · Plus-50 II 10W-30 Engine OilJohn Deere Plus-50 II Premium 10W-30; capacity 5.4 L (5.7 qt).
Every 400 hours or annuallyCapacity: 5.4 L
EngineReplace engine oil filterM806419 · Engine Oil Filter
Every 400 hours or annually, whichever comes first
Fuel & AirReplace fuel / water separatorMIU803221 · Fuel / Water SeparatorFilter element MIU802421 is listed with the separator.
Every 400 hours or annually
Fuel & AirReplace spin-on fuel filterMIU803127 · Secondary Fuel Filter
Every 400 hours or annually
Fuel & AirReplace primary air filterRE68048 · Primary Air Filter
Every 600 hours or annually
Fuel & AirReplace secondary air filterRE68049 · Secondary Air Filter
Every 600 hours or annually
TransmissionChange transmission / hydraulic oilTY22000 · Low Viscosity Hy-Gard Transmission / Hydraulic OilJohn Deere Low Viscosity Hy-Gard; capacity 47.3 L (12.5 gal).
Every 400 hours or annuallyCapacity: 47.3 L
TransmissionReplace transmission oil filterRE45864 · Transmission / Hydraulic Oil Filter
Every 400 hours or annually
PTOReplace front pto filterLVA23443 · Front PTO FilterWhen equipped with front PTO.
Every 400 hours or annually
HydraulicsReplace hydraulic oil filterLVA10419 · Hydraulic Oil Filter
Every 400 hours or annually
AxleChange front axle oil - heavy-duty axleTY22035 · Low Viscosity Hy-Gard Front Axle OilHeavy-duty front axle capacity 8.0 L (8.5 qt).
Every 600 hoursCapacity: 8 L
AxleChange front axle oil - standard axleTY22035 · Low Viscosity Hy-Gard Front Axle OilStandard front axle capacity 5.5 L (5.8 qt).
Every 600 hoursCapacity: 5.5 L
Compatible maintenance parts
Part fitment is shown only where a technical source is attached. Serial-number restrictions may apply.
RE68048Primary Air FilterAir Filters →RE68049Secondary Air FilterAir Filters →M806419Engine Oil FilterEngine Oil Filters →TY26669Plus-50 II 10W-30 Engine OilEngine Oils →MIU802421Fuel / Water Separator ElementFuel Filters →MIU803127Secondary Fuel FilterFuel Filters →MIU803221Fuel / Water SeparatorFuel Filters →LVA10419Hydraulic Oil FilterHydraulic Filters →LVA23443Front PTO FilterHydraulic Filters →RE45864Transmission / Hydraulic Oil FilterHydraulic Filters →TA25765Filter PakMaintenance Kits →TY22000Low Viscosity Hy-Gard Transmission / Hydraulic OilTransmission & Hydraulic Fluids →TY22035Low Viscosity Hy-Gard Front Axle OilTransmission & Hydraulic Fluids →