Precision Remanufacturing Backed by Real Testing

At Turbo Kings, every Sheppard HD94PK3 power steering gearbox is rebuilt through a controlled, in-house remanufacturing process designed to restore OEM steering precision, hydraulic integrity, and long-term reliability.

Manufactured by Sheppard, the HD94PK3 belongs to the HD94 gearbox family — a heavy-duty, integral hydraulic steering gearbox engineered for high front-axle loads, continuous duty cycles, and demanding commercial service environments. This gearbox converts hydraulic pressure into controlled mechanical steering force, delivering consistent assist while maintaining tight on-center feel and predictable response.

Unlike light-duty steering units, the HD94 series uses a robust worm shaft, sector shaft, and piston assembly housed in a high-strength cast iron gearbox body. The PK3 configuration identifies a specific port orientation, mounting pattern, and internal valving calibration tailored to certain chassis and axle geometries.

At Turbo Kings, this is not a reseal or cosmetic refresh. Each gearbox is fully disassembled down to the bare housing. All internal components are cleaned, inspected, measured, and requalified to Sheppard OEM specifications.

What Makes a Turbo Kings Rebuild Different

Every HD94PK3 gearbox undergoes a complete remanufacturing sequence:

• Complete Teardown & Inspection – Worm shaft, sector shaft, piston, and valve assemblies are measured for wear, scoring, and fatigue.

• Precision Machining – Critical sealing surfaces, bores, and shaft interfaces are restored to OEM tolerances.

• OEM-Grade Internal Components – Seals, O-rings, bearings, bushings, and wear components are replaced using Sheppard-spec materials.

• Hydraulic Integrity Restoration – Internal valving is rebalanced to ensure smooth assist and consistent steering response.

• Controlled Assembly & Torque Verification – All components are assembled using calibrated torque procedures to maintain alignment and preload.

No shortcuts. No reused wear parts. Every internal function is restored, not assumed.

Why Fleets and Owner-Operators Trust Turbo Kings

Steering gearboxes are safety-critical components. Fleets choose Turbo Kings because each HD94PK3 gearbox is validated under real hydraulic conditions before it ever leaves the shop.

Once assembled, every unit is hydraulically bench-tested to verify:

• Leak-free operation under pressure

• Proper steering assist response

• Internal bypass and relief function

• Smooth shaft rotation and consistent effort

Only gearboxes that meet Sheppard OEM performance standards are serialized, documented, and cleared for shipment. This eliminates guesswork, reduces comeback risk, and ensures predictable steering behavior once installed.

Our Process at a Glance

• Full Disassembly & Core Inspection

• Precision Cleaning & Surface Preparation

• Replacement of All Wear Components

• OEM-Spec Assembly & Torque Control

• Hydraulic Pressure & Leak Testing

• Final Inspection, Serialization & Documentation

Standard Features

• Fully Remanufactured Sheppard HD94PK3 Gearbox
• Hydraulically Pressure-Tested
• Restored OEM Steering Feel & Assist
• Leak-Free Sealing Integrity
• Installation-Ready Unit
• 12-Month Unlimited-Mileage Warranty
• Fast Core Exchange Program

Applications

Compatible with heavy-duty trucks and chassis originally equipped with Sheppard HD94PK3 power steering gearboxes.
Visual and OEM verification of part number, mounting pattern, and port orientation is required before installation.