John Deere — Check and Adjust Rotary Injection Pump Dynamic Timing

Adjustments · Rotary fuel 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

Procedure

1. Install JT07158 (or FKM10429A) TIME TRAC Kit.
2. Install transducer or in-line SOI sensor on No. 1 fuel injection line at nozzle end; use No. 4 or No. 6 line if access restricted.
3. Install magnetic pick-up in flywheel timing hole with 0.64 mm (0.025 in.) air gap; do not stop engine at TDC.
4. Engine OFF; push ON/CLEAR; select MAG PROBE, set Trig Level to 70%, press ENTER.
5. Set Offset to 0 degrees and press ENTER.
6. Start engine, press ENTER; run engine at 1300 rpm, press ENTER to calibrate.
7. Warm engine to normal operating temperature; check slow and fast idle rpm; adjust as necessary.
8. Run engine at wide open throttle and load engine down gradually to rated speed rpm.
9. Record engine speed and timing degrees; compare to Section 06, Group 210 or machine technical manual.
10. Stop engine; loosen injection pump mounting flange nuts and adjust pump timing.
11. To advance timing rotate top of pump clockwise (viewed from rear/flywheel end); to retard rotate counterclockwise.
12. Tighten injection pump mounting flange nuts to 27 N•m (20 lb-ft).
13. Start engine and recheck dynamic timing; adjust as needed.
14. Grind away original front plate timing mark and stamp a new mark aligned with injection pump flange mark.

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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