John Deere — Check Cold Start Advance System Operation—Rotary Pumps
Testing & diagnosis
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
- After checks are completed, return cold start circuits to original configuration to ensure proper injection pump timing and conformance to emission control standards.
Procedure
- Install JT07158 (FKM10429A) TIME TRAC Kit; checks must be performed on a cold engine.
- Verify voltage potential (12 or 24 volts) to the cold start solenoid.
- Disconnect wiring connector from the cold start advance solenoid.
- Start cold engine and run at 1200 rpm; check and record injection pump timing.
- Connect wiring connector to cold start advance solenoid.
- After approximately 30 seconds, check injection pump timing.
- Stanadyne: there should be a 7—10° increase in timing; Delphi/Lucas: a 7—10° decrease.
- If no change, service the cold start advance solenoid and valve, or have the injection pump serviced by an authorized ADS Diesel Repair Station.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Cold Start Switch—Torque 5 N•m (3.5 lb-ft) (42 lb-in.)
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.