John Deere 1023E, 1025R & 1026R Compact Utility Tractor Repair Manual

Remove the rear PTO driveshaft as described in the Power Train Repair section (Group 20 - Rear PTO Driveshaft) and inspect the shaft seal and bushing for wear or misalignment. Replace the seal and check the shaft for scoring before reassembly. Grease the PTO shaft at the interval in the General Information section to prevent dry running that accelerates seal wear. Verify the transmission and hydraulic system fluid level (12.3 L spec) after any seal work before returning to service.

Clean the radiator screen first - it collects chaff and debris quickly and is the most common cause on these compact tractors. Then check the hydraulic filter (LVA16054) for restriction and replace on schedule. The Hydraulic Tests section covers pump pressure verification at 138 bar (2000 psi); if pressure is low, the pump may have internal wear driving heat. Check the transmission and hydraulic fluid level against the 12.3 L (3.25 gal) capacity and top up with the approved fluid grade from the Fuel and Lubricants section.

The Engine section documents the dipstick access point and the correct wipe-and-recheck procedure for each Yanmar variant. Pull the dipstick fully, wipe clean, reinsert to the stop, then remove and read without resting the tube on the threads. Low oil on these Yanmar 3-cylinder engines causes premature main bearing wear; check at every 10-hour interval or before each daily use. Crankcase capacity is 2.7 L (2.9 qt) with filter for all three models (3TNM74, 3TNV80, 3TNV76).

Inspect the fuel system for water contamination or algae growth in the tank and bleed the system using the procedure in the Fuel System section (Section 30, Group 05). Cold start issues on the 3TNM74 and 3TNV80 are often compounded by a fouled primary air filter (M113621). Replace the primary and secondary air filters at the intervals in the General Information section. The manual also covers the optional air heater start aid fitted to some 1023E units.