John Deere 4045 / 6068 — Remove and Install Suction Control Valve
Repair & overhaul · Suction Control Valve on high pressure fuel pump
For the John Deere 4045 / 6068, from the John Deere service manual.
Applies to: John Deere 4045, John Deere 6068
Before you start
- DO NOT handle replacement valve parts with dirty hands or gloves.
- DO NOT allow engine coolant or brake fluid to contact o-rings.
- DO NOT use any tool to connect wire harness.
Procedure
- Thoroughly clean suction control valve area and surrounding surfaces.
- Disconnect the suction control valve wire connector (A). Avoid damaging connector. DO NOT twist.
- Loosen 2 retaining bolts (B) with a 5 mm Allen hex tool. Do not completely remove bolts.
- Remove the suction control valve from pump body by hand, pulling straight out. DO NOT twist or pry.
- Remove and discard the 2 retaining bolts.
- Remove any residual gasket material; remove o-ring if stuck.
- Verify overall reference length of valve is 27.6 mm (1.09 in.).
- Lubricate large and small o-rings with diesel fuel.
- Install large o-ring into groove in pump housing.
- Install new suction control valve assembly into pump body by hand until flange nearly contacts pump housing.
- Install new retainer bolts and tighten evenly to specification.
- Connect suction control valve wire harness, connect negative battery cable, start engine and perform computer diagnostics.
- Check joint for fuel leaks; verify proper operation.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Suction Control Valve to Pump Housing 9 N·m (7 lb-ft)
- Valve reference length 27.6 mm (1.09 in.)
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.