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HOWO Dump truck Double H valve WG2203250003, used for HW19710 gearbox, work toghter with sinotruk air pneumatic lock valve.
As an important gearbox part, double H valve is mainly used to realize high and low gear switching and basic gear switching with auxiliary box. This model is mainly used in the gearbox of Sinotruk series.
Function
1. Air passage switching: Its internal passages resemble the letter "H". The vertical lines on the left and right connect to the external high-pressure and low-pressure air lines, respectively; the horizontal line in the middle is the ventilation chamber inside the gearbox.
High-Gear Mode: When the driver shifts into "high gear," the valve's baffle moves, opening the passage between the left vertical line (high-gear air passage) and the central horizontal line, and closing the right vertical line (low-gear air passage). At this point, air pressure can only enter the high-gear air chamber of the transmission from the left, causing the clutch inside the gearbox to lock into high gear.
Low-Gear Mode: When shifting into "low gear," the valve moves, opening the passage between the right vertical line and the central horizontal line, and closing the left vertical line. Air pressure can only enter the low-gear air chamber from the right, causing the clutch inside the gearbox to lock into low gear.
2. Gear Shift Command Control: This system is connected to the gear shift lever in the driver's cab. When the driver pulls the lever, moves the shift fork, or presses the foot switch, the gear shift solenoid valve in the cab activates. However, this gear shift solenoid valve is only a control switch (on/off); it cannot directly open the high and low gear channels inside the gearbox. It requires an intermediate component, which is the dual H-valve.
Control process: When the shift solenoid valve is energized, the internal coil is energized, generating a magnetic field. This magnetic field attracts or repels the small valve core (actuator) inside the double H valve. The valve core is pushed, causing the gate to rotate, completing the switching between the high-gear and low-gear channels.
DETAILS
| DESCRIPTION | Double H valve | PART NUMBER | WG2203250003 |
| WEIGHT | 0.5KG | VOLUME | 5*5*7cm |
| MOQ | 1 | WARRANTY | 1 year |
| PAYMENT | TT/WESTEN UNION | SHIPMENT | by air/sea/railway |
| BRAND | SINOSACHS | COUNTRY OF ORIGIN | CHINA |
| STOCK | IN STOCK | APPLICABLE SITE | gearbox |
Symptoms
1. The most typical symptoms are the inability to engage high gear or low gear. This is due to the air circuit not switching correctly, leading to gear jamming or difficulty in shifting gears.
2. Unusual noises during gear shifting indicate a potential malfunction in the pneumatic control system.
3. Some vehicle models may be equipped with a gear shift malfunction indicator light; if the air pressure signal is abnormal, a warning light will illuminate on the instrument panel.
Replacement Advice
1. It is recommended to inspect the pneumatic control system every 150,000 to 200,000 kilometers. If shifting becomes difficult or air pressure leaks occur, it is recommended to replace the entire assembly immediately.
2. If the air valve is stuck, the seals are aged and leaking, or the air pipe connectors are rusted or corroded, the entire assembly needs to be replaced.
3. Before replacement, it is recommended to check whether the air pipe connectors on the gearbox are loose or leaking to confirm that the malfunction is not simply due to a pipeline problem.
For the maintenance of the double H valve, it is necessary to check whether it is leaking or blocked. Most of the time, the double h valve assembly needs to be replaced directly. It is recommended to replace the high-quality original parts or accessories from the factory.
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