Fast Transmission Range/Shift Cylinder Assembly JS220-1707060-16

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Fast Transmission Range/Shift Cylinder Assembly JS220-1707060-16

Compatible with Fast Gear 12-speed and 16-speed classic heavy-duty dual intermediate shaft gearbox series (such as 12JS200T, 12JSDX220T, 12JS160T, etc.).

Widely installed across major domestic heavy-duty truck platforms, including 

Shacman (Delong F2000, F3000, M3000, X3000, X5000, X6000 series);

Sinotruk (HOWO and Haohan models equipped with Fast transmissions);

FAW Jiefang, Foton Auman, and Dongfeng Tianlong models featuring Fast 12-speed or 16-speed transmission systems.

List of Core Internal Components for the Cylinder Assembly (BOM)
1. 12JS160T-1707062: Range-shift cylinder housing (twin-bore die-cast aluminum casing with an anti-oxidation and anti-corrosion surface coating).
2. 12JS200T-1707061: Range-shift shift fork shaft (hardened piston rod with a mirror-polished finish; connects directly to the high/low range synchronizer shift fork).
3. 14341: Range-shift cylinder piston (designed for a balance of lightweight construction and high wear resistance).
4. 14344 & 14765: Core cylinder O-ring / Piston double-lip seal (made from high-specification rubber resistant to wear and low temperatures; ensures an airtight, smooth-operating pneumatic system even in freezing winter conditions as low as -30°C).
5. 12JS160T-1707063: Auxiliary section cylinder anti-loosening plug.
6. 14349: Cylinder head gasket (for static sealing of the outer cover plate).

Common Fault Symptoms and Replacement Recommendations
1. Failure to shift between high and low ranges or inability to engage a gear: This is the most common symptom. When toggling the high/low range switch in neutral, a faint hissing sound is heard from the auxiliary gearbox, yet the system fails to shift from low to high range, or it automatically drops back to neutral while in the high range.
This is usually caused by air leakage due to worn cylinder seals, preventing air pressure from driving the shift fork fully into position.
2. Continuous air leakage from the exhaust port: During operation of the transmission control valve or dual-rod valve, a continuous hissing sound of escaping air is heard from the rear of the cylinder or the air distribution valve exhaust port. This causes a drop in the vehicle's overall air pressure and, in severe cases, triggers a low-pressure warning for the braking system.
3. Overhaul and replacement advice: If inspection reveals severe scratches on the cylinder's inner wall or wear and deformation of the piston rod, it is recommended to replace the entire JS220-1707060-16 cylinder assembly rather than simply replacing the internal seal kit; this provides a permanent solution to high/low range shifting issues.

DETAILS

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