John Deere — Remove and Install High Pressure Common Rail
Repair & overhaul · High Pressure Common Rail (HPCR)
From a John Deere service manual — check it applies to your exact model before use.
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Before you start
- Wait a minimum of 15 minutes after engine is stopped before disconnecting any high pressure fuel lines.
Procedure
- Wait a minimum of 15 minutes after engine is stopped before disconnecting high pressure fuel lines.
- Disconnect pressure sensor wiring harness.
- Disconnect leak-off line from elbow fitting.
- Remove pump-to-rail high pressure lines.
- Remove high pressure delivery lines from rail; do not remove flow damper.
- Loosen cap screw and remove the high pressure common rail from engine.
- Install bracket on engine; install rail on bracket and tighten cap screw to 70 N•m.
- Install 90 degree elbow fitting into rail leak off port; tighten to 15 N•m.
- Install high pressure delivery lines; tighten to 30 N•m.
- Install pump-to-rail high pressure lines; tighten to 30 N•m.
- Connect leak-off line to elbow fitting; connect wiring harness to pressure sensor.
- Bleed fuel system.
Specs & values
- High pressure common rail bracket to engine—70 N•m (52 lb-ft)
- High pressure delivery lines to rail—30 N•m (22 lb-ft)
- Pump-to-rail high pressure lines—30 N•m (22 lb-ft)
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.