John Deere — Install Piston Rings
Repair & overhaul
From a John Deere service manual covering: 4045, 4045TF120, 6068, 6068 HF485, 6068HF158, 6068TF120, 6068TF250, 6068TFM50, 6068TFM76. Check it applies to your exact model before use.
Applies to: John Deere 4045, John Deere 4045TF120, John Deere 6068, John Deere 6068 HF485, John Deere 6068TF120, John Deere 6068TF250, John Deere 6068TFM50, John Deere 6068TFM76
Before you start
- Piston rings can be damaged if expanded too far
Procedure
- Use piston ring expander to install oil ring expander in bottom ring groove.
- Install oil control ring over expander with end gap opposite expander gap.
- Identify top side of compression rings by marks.
- Install rectangular compression ring in center groove with top toward top of piston.
- Position gap opposite the oil control ring gap.
- Install keystone compression ring in top groove with top toward top of piston.
- Position gap opposite the rectangular compression ring gap.
- Stagger ring gaps as shown.
Tools required
- JDE85, JDE135 or KJD10140 Piston Ring Expander Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Full service-parts list: John Deere 4045 →, John Deere 6068 →, John Deere 6068 HF485 →, John Deere 6068TF250 →, John Deere 6068TFM50 →, John Deere 6068TFM76 →
Source: John Deere service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.