10.7 - Steering¶

Full hydraulic steering with no mechanical linkage: a PSC pump feeds a PSC orbital steering control valve, which drives a double-ended ram. Ram stroke is limited to Dana 44 spec by Busted Knuckle Off-Road steering stops, and the ram mounts via an Artec Industries Dana 60 ram mount cut down to fit the Dana 44. A Mishimoto fluid cooler with fan (gated by a 180 °F inline thermostat) cools the circuit.¹

Component part numbers below come from the PSC FHK400TJ kit — the 1997-2006 TJ/LJ Extreme Series full hydraulic kit with a 2.75" double-ended cylinder (PSC's 40"+ tire kit).² The orbital valve and cylinder carry over directly; the kit pump is the exception — its PK40JP2-FH bracket is Jeep 4.0L-specific and does not fit this build's Cummins R2.8.

Specifications¶

System Components¶

Hydraulic Pump¶

Pump is engine-specific — the kit pump does not fit. The FHK400TJ kit ships a PK40JP2-FH pump kit built for the Jeep 4.0L accessory drive. This build runs a Cummins R2.8, so the kit pump/bracket does not bolt up — a Cummins-compatible PSC pump must be sourced. The kit's orbital valve and cylinder are engine-agnostic and carry over unchanged.

Steering Control Valve¶

Steering Ram¶

Reservoir¶

Cooler¶

Fluid Specifications¶

Outstanding Items¶

Build Tasks¶

• Source a Cummins R2.8-compatible PSC pump + bracket (kit PK40JP2-FH is 4.0L-only)
• Confirm pump drive type (belt vs Cummins gear-drive), flow rate, and pressure
• Confirm the Dana 44 stroke length set by the Busted Knuckle stops
• Document Artec Industries ram mount part number and the Dana 44 cut dimensions
• Confirm remote reservoir model and mounting location
• Confirm fluid system fill quantity
• Confirm Mishimoto cooler fan current draw fits the PMU Out 8 (~15A) budget
• Document hydraulic line routing

Related Documentation¶

• Front Axle
• Suspension