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Home›Repair guides›John Deere›Remove Stanadyne Model DB2 and DB4 Injection Pump

John Deere — Remove Stanadyne Model DB2 and DB4 Injection Pump

Repair & overhaul · Stanadyne DB2/DB4 injection pump

From a John Deere service manual covering: 4045, 4045TF120, 6068, 6068TF120, 6068TF250, T06068TF220, T06068TF250, T06068TFM50. Check it applies to your exact model before use.

Applies to: John Deere 4045, John Deere 4045TF120, John Deere 6068, John Deere 6068TF120, John Deere 6068TF250, John Deere POWERTECH 4.5 L & 6.8 L Diesel Engines (4045 / 6068) engine

Before you start

  • Never steam clean or pour cold water on a fuel injection pump while the pump is running or while it is warm.

Procedure

  1. Clean the fuel injection pump, lines and area around the pump with cleaning solvent or a steam cleaner.
  2. Disconnect shut-off cable, speed control linkage and electrical connections; tag wires.
  3. Disconnect fuel return line and fuel supply line.
  4. Disconnect all fuel delivery (pressure) lines using a 17 mm deep-well crowsfoot socket.
  5. Remove injection pump drive gear cover.
  6. Remove drive gear retaining nut and washer from end of pump shaft; do not let washer fall inside timing gear cover.
  7. Attach JDG1560 Drive Gear Puller to injection pump drive gear.
  8. Evenly tighten two 6 mm Grade 12.9 cap screws and snugly tighten center forcing screw against end of pump shaft.
  9. Tighten center forcing screw until pump drive gear is free from the tapered shaft; remove puller.
  10. Check timing marks on back side of front plate and pump flange are present and aligned.
  11. Remove three injection pump mounting stud nuts and remove injection pump.

Tools required

  • JDG1560 Injection Pump Drive Gear Puller Amazon
  • 17 mm deep-well crowsfoot socket Amazon

Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.

Specs & values

  • Stanadyne DB2 Drive Gear-to-Shaft Retaining Nut—Torque 125 N•m (92 lb-ft)
  • Stanadyne DB4 Drive Gear-to-Shaft Retaining Nut—Torque 200 N•m (148 lb-ft)

Full service-parts list: John Deere 4045 →, John Deere 6068 →, John Deere 6068TF250 →

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.

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