John Deere — Adjust Fuel Injection Nozzle
Adjustments
From a John Deere service manual — check it applies to your exact model before use.
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Before you start
- The nozzle tip must always point away from the operator; fuel can penetrate skin
Procedure
- On RSN nozzles unscrew spring chamber cap using JDG1521
- Loosen and remove lock nut of lift adjusting screw
- Loosen lock nut of pressure adjusting screw
- Connect nozzle to tester and adjust opening pressure by turning pressure adjusting screw
- Tighten lock nut to 10 N•m then recheck opening pressure
- Screw lift adjusting screw until it bottoms on spring seat
- Unscrew lift adjusting screw by specified number of turns
- Tighten lock nut of lift adjusting screw to 5 N•m and recheck opening pressure
Tools required
- JT25510 nozzle tester Amazon
- KJD10109 pressure line Amazon
- JDG949 wrench Amazon
- JDG1515-2 wrench Amazon
- JDG1521 Amazon
- JDG1522 Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Pressure adjusting screw lock nut 10 N•m (7 lb-ft)
- Lift adjusting screw lock nut 5 N•m (3.5 lb-ft)
- 3029D FridayParts $21.96 SinoCMP $1499.00 non-certified valve lift 1/2 turn
- 3029T FridayParts $145.00 SinoCMP $299.00 non-certified valve lift 3/4 turn
- 3029 certified/non-certified valve lift 3/4 turn
- RSN 3029D FridayParts $21.96 SinoCMP $1499.00 certified valve lift 7/8 turn
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.