SINOTRUK HOMAN Limit Valve Assembly / Hydraulic Limit Valve FG9804731075

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HOMAN Limit Valve Assembly / Hydraulic Limit Valve FG9804731075

Core Functions and Operating Principle
1. Maximum Lift Limit: The dump truck's cargo bed rises under the thrust of the hydraulic cylinder (FG9804741007). Upon reaching the designed maximum safe tipping angle, a cable, linkage, or the cargo bed itself triggers the limit valve's mechanical actuator (control lever).
2. Pneumatic Circuit Switching and Hydraulic Cut-off: Once the limit valve is actuated, its internal pneumatic circuit switches instantly, directing the control air supply to the lift control valve.
3. Prevention of Hydraulic Over-extension: Upon receiving the pneumatic signal, the control valve automatically cuts off the flow of high-pressure hydraulic fluid to the cylinder and redirects the fluid to flow straight back into the hydraulic reservoir. Consequently, the cargo bed stops rising and remains securely held at the safe maximum tipping angle, thereby preventing damage caused by the cylinder over-extending (bottoming out) or vehicle rollover accidents resulting from excessive lifting.

Common Faults and Routine Troubleshooting
1. Cargo bed fails to lift to the maximum height or does not lift at all: The cause is often a stuck internal spool in the limit valve or a mechanical rocker arm that fails to return to its neutral position. This keeps the valve in a "limit" state-where air pressure is released and hydraulic flow is cut off-preventing high-pressure oil from entering the cylinder.
2. Cylinder fails to stop extending at the limit angle, leading to continued pressure buildup or snapping of the limit cable: Causes include a limit cable that is too loose or broken, or an internal air leak in the limit valve preventing the spool from shifting. This is a highly dangerous operating condition that can easily result in cylinder oil leakage or damage to the top of the cylinder.

DETAILS

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