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

John Deere — Install 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

  • Do not tighten hex nuts more than three full turns on mounting studs.
  • Do not use tightening force of pump mounting stud nuts to pull pump shaft into drive gear ID.

Procedure

  1. Lubricate a new square sealing ring with clean engine oil and install into groove on front face of pump mounting flange.
  2. Slide injection pump onto mounting studs while inserting pump shaft into drive gear.
  3. Check pump shaft and index pin for proper alignment with pump drive gear key slot.
  4. Install three flat washers, lock washers and hex nuts; tighten nuts three turns only.
  5. Install pump mounting flange flush to engine front plate with drive gear held flush.
  6. Finger tighten mounting stud nuts with pump shaft index pin engaged in drive gear key slot.
  7. Push pump drive gear firmly onto shaft taper; install washer and retaining nut.
  8. Tighten retaining nut: DB2 125 N•m (92 lb-ft); DB4 200 N•m (148 lb-ft).
  9. Install access cover plate using a new O-ring; apply LOCTITE 242 to cap screw threads; tighten to 6 N•m (4.5 lb-ft).
  10. Align timing mark on pump flange with timing mark on front plate.
  11. Tighten three hex nuts securing the pump to the front plate to 27 N•m (20 lb-ft).
  12. Connect injection pump pressure lines in firing order (1-5-3-6-2-4 on 6-cylinder; 1-3-4-2 on 4-cylinder); tighten to 27 N•m (20 lb-ft).
  13. Connect fuel supply line and fuel return line.
  14. Bleed air from fuel system; start engine, run several minutes and check entire fuel system for leaks.

Tools required

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

Specs & values

  • Rotary Injection Pump Front Access Plate Cap Screws—Torque 6 N•m (4.5 lb-ft) (54 lb-in.)
  • Rotary Injection Pump Mounting Nuts—Torque 27 N•m (20 lb-ft)
  • Fuel Injection Pump Delivery Lines—Torque 27 N•m (20 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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