TRI-Ring SITOM Recirculating-ball Power Steering Gear Assembly XE142 SH-ZXQ 3401010-ST02 FN085ST02

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TRI-Ring SITOM Recirculating-ball power steering gear assembly XE142 SH-ZXQ 3401010-ST02 FN085ST02

Product Features

1. Hydraulic Power Assistance: Converts high-pressure hydraulic fluid from the steering pump into powerful mechanical thrust, allowing the wheels to be turned effortlessly with minimal manual effort-even when the truck is fully loaded or performing a stationary turn.
2. Fail-Safe Protection: Features an integrated hydraulic-mechanical design. In the event of a total hydraulic system failure-such as an engine stall or a ruptured fluid line-a rigid mechanical connection remains between the steering wheel and the wheels, ensuring the driver can still steer and perform an emergency stop using purely mechanical force.
3. Optimized Road Feel (Variable Steering Ratio): Utilizes a variable gear ratio design; the steering feels stable and steady during high-speed straight-line driving to ensure safety, while offering responsive handling during low-speed turns or parking maneuvers, along with automatic wheel self-centering after a turn.
4. Overload Protection (Limit-Based Pressure Relief): Incorporates an internal automatic hydraulic relief valve. When the steering wheel is turned to its maximum limit, the system automatically enables high-to-low pressure circulation, instantly relieving excessive hydraulic pressure in the steering system to prevent pump burnout, belt slippage, or high-pressure line failure.

Routine Maintenance and Troubleshooting
1. Strict Oil Specifications: Only hydraulic steering fluid meeting required standards must be used; the use of inferior machine oil is strictly prohibited, as it can easily damage internal high-pressure oil seals and cause leaks.
2. Heavy or Binding Steering: If the steering becomes heavy or the effort required differs between left and right turns, first check whether the steering pump's output pressure meets specifications and inspect the universal joint on the steering input shaft (at the top of the steering gear) for binding or lack of lubrication.
3. Travel Limit Valve Adjustment: After replacing the unit or overhauling the steering linkage (tie rods and drag links), the limit screw located beneath the steering gear must be readjusted. This prevents the hydraulic system from remaining under excessive pressure when the steering is turned to the lock position, which could otherwise cause the power steering pump to burn out or hydraulic lines to burst.

DETAILS

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