John Deere 4045 / 6068 — Remove and Install High Pressure Fuel Pump
Repair & overhaul · Denso HP3 High Pressure Fuel Pump
For the John Deere 4045 / 6068, from the John Deere service manual.
Applies to: John Deere 4045, John Deere 6068
Procedure
- Disconnect wiring harness from suction control valve (A), fuel temperature sensor (B) and pump position sensor (C).
- Remove high pressure fuel lines (D).
- Remove fuel leak-off line (E).
- Disconnect fuel supply line (F).
- Remove the 3 nuts (G) fixing adapter plate on engine front plate.
- Carefully remove high pressure pump assembly from engine.
- Disassemble pump from adapter plate, replace parts as necessary.
- Reassemble: install pump on adapter plate with new O-ring, install gear and tighten nut, install pump position sensor and fittings.
- Install: rotate engine to TDC of number 1 cylinder and install JDG1571 Timing Pin in flywheel.
- Install pump so timing mark can be seen through timing gear cover opening; install 3 nuts.
- Install high pressure fuel lines and leak-off line and fuel supply line.
- Reconnect wiring harness and reinstall plug.
- Bleed fuel system.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- High pressure pump to adapter plate 40 N·m (30 lb-ft)
- High pressure pump gear nut 70 N·m (52 lb-ft)
- Pump position sensor to adapter plate 15 N·m (11 lb-ft)
- Fuel supply elbow fitting nut 20 N·m (15 lb-ft)
- Fuel leak-off fitting nut 15 N·m (11 lb-ft)
- Adapter plate to engine front plate 40 N·m (30 lb-ft)
- High pressure fuel line (both ends) 30 N·m (22 lb-ft)
- Plug to access gear timing mark 50 N·m (37 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.