John Deere 4045 / 6068 — Remove and Install Pressure Limiter
Repair & overhaul · Fuel pressure limiter on HPCR
For the John Deere 4045 / 6068, from the John Deere service manual.
Applies to: John Deere 4045, John Deere 6068
Before you start
- Wait a minimum of 15 minutes after engine is stopped before disconnecting any high pressure fuel lines.
- Do NOT reuse the pressure limiter once removed from the rail.
Procedure
- Thoroughly clean all fuel lines, fittings, components, and chamfered area around the pressure limiter.
- Disconnect leak-off line then remove fitting (C) from pressure limiter (B) using a backup wrench.
- Remove pressure limiter. Check entire assembly is together; use clean magnet for loose components.
- Scrap the pressure limiter as it is not reusable.
- Install new pressure limiter (B) into common rail (A). Tighten to specification.
- Install leak-off line fitting (C) to pressure limiter using a backup wrench. Tighten nut to specification.
- Connect leak-off line then tighten tube nuts until seated.
- Bleed fuel system.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Pressure Limiter 176 N·m (130 lb-ft)
- High Pressure Common Rail Leak-off Line Fitting 6 N·m (11 lb-ft)
Full service-parts list: John Deere 4045 →, John Deere 6068 →
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.