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Moisture and contaminants are the enemies of any compressed air system, especially in the heavy‑duty braking and suspension circuits of SANY trucks. The genuine HQ3555015SQ38 Pneumatic System Filter Dryer is an OEM‑grade combined filtration and desiccant drying unit engineered to deliver laboratory‑clean, bone‑dry air to your vehicle’s pneumatic network. As a vital component in the portfolio of SANY parts, the HQ3555015SQ38 guarantees perfect fitment, precise dew‑point suppression, and unmatched corrosion protection.
It integrates a high‑efficiency coalescing pre‑filter, a moisture‑hungry desiccant bed, and a self‑cleaning purge system – all in one robust housing. Whether your SANY truck operates in the humid tropics or the freezing arctic, this filter dryer ensures that every brake application is safe, every suspension leveling valve responds instantly, and costly pneumatic component failures are avoided.
Pneumatic System Filter Dryer
Осушитель с фильтром пневмосистемы
Secador Filtro del Sistema Neumático
Compressed air leaving the air compressor is hot, saturated with moisture vapor, and laden with oil aerosol and solid contaminants. The HQ3555015SQ38 is a multi‑stage purification device. First, incoming air passes through a cyclonic spin chamber that centrifuges out bulk liquid water and large particles. Next, it encounters a high‑efficiency coalescing filter element that removes oil aerosols down to 0.01 microns. The air then flows through a deep bed of hygroscopic desiccant beads – typically activated alumina or molecular sieve – which adsorb water vapor through capillary action. The dry air (dew point as low as -40°C) exits to the air reservoirs, protected by an integral check valve.
During the compressor’s unload phase, a small portion of this dry air is expanded and routed backward through the desiccant, purging the collected moisture to atmosphere. This self‑regeneration cycle gives the HQ3555015SQ38 an exceptionally long service life.
The integrated electronic timer and heater (on certain variants) ensure reliable purge valve operation even in sub‑zero temperatures, preventing freeze‑ups that plague standard air dryers. A built‑in pressure regulator maintains optimal operating pressure for the dryer itself, independent of system pressure fluctuations. The HQ3555015SQ38 also features a replaceable spin‑on cartridge design, allowing the desiccant and filter elements to be serviced quickly without removing the entire mounting bracket.
SANY engineers have calibrated the purge volume and regeneration timing to match the duty cycle of the truck’s air compressor, minimizing air loss while maximizing drying efficiency. This intelligent design is why the HQ3555015SQ38 is the preferred choice for SANY heavy‑duty vehicles operating in demanding environments.
The HQ3555015SQ38 housing is die‑cast from corrosion‑resistant A380 aluminum alloy, protected by a durable powder‑coat finish that withstands 500+ hours of salt spray testing. The desiccant bed consists of premium spherical beads with high crush strength, preventing dusting and channeling that would reduce drying efficiency. The coalescing filter media is a borosilicate micro‑fiber matrix, pleated to maximize surface area and treated with a proprietary oleophobic coating to shed oil and water.
An integrated safety relief valve protects the system from over‑pressurization. All internal seals are made from HNBR (hydrogenated nitrile rubber), offering exceptional resistance to high temperatures, oil, and ozone. Every HQ3555015SQ38 unit is leak‑tested at the factory to ensure zero internal and external leakage – a level of quality control that generic aftermarket units simply cannot match.
The purge valve assembly in the HQ3555015SQ38 is a masterpiece of pneumatic design. It utilizes a low‑power solenoid with a balanced poppet to ensure reliable operation across a supply voltage range of 18‑32V DC. The valve seat is machined from stainless steel and the diaphragm from FKM fluoroelastomer, ensuring millions of trouble‑free cycles.
The timing circuitry is potted in thermally conductive epoxy, protecting it from vibration and thermal shock while dissipating heat efficiently. For cold‑climate operation, an optional 24V DC heater cartridge maintains the purge valve temperature above freezing, preventing ice from blocking the exhaust port. These engineering details, invisible to the naked eye, make the HQ3555015SQ38 the most robust and reliable air dryer in its class.
The table below provides comprehensive technical data for the genuine SANY HQ3555015SQ38 Filter Dryer. These parameters are essential for verifying compatibility and understanding the performance capabilities of this critical pneumatic system protector.
| Parameter | Specification | Details |
|---|---|---|
| OEM Part Number | HQ3555015SQ38 | Genuine SANY Identification |
| Component Name | Pneumatic System Filter Dryer | Air Dryer with Integral Filter |
| Maximum Working Pressure | 12.5 bar (181 psi) | Standard for Heavy Truck Air Systems |
| Rated Flow Capacity | 850 l/min @ 7 bar | Sufficient for Large Displacement Engines |
| Desiccant Type | Activated Alumina / Molecular Sieve | High Crush Strength, Spherical Beads |
| Dew Point Suppression | -40°C (-40°F) at nominal flow | Prevents Ice Formation in Valves |
| Filtration Efficiency (Coalescer) | 99.97% @ 0.01 microns | Removes Oil Aerosols & Fine Dust |
| Purge Volume | 15 – 20% of inlet flow | Optimized for Regeneration |
| Heater Voltage (Optional) | 24V DC, 80W | For Sub‑Zero Operation |
| Solenoid Voltage | 24V DC | Standard Truck Electrical System |
| Port Threads | M22 x 1.5 / NPT 1/2″ (Model Dep.) | Direct Replacement Fit |
| Mounting Type | Bracket Mount or Direct Spin‑On | Cartridge Replaceable |
| Housing Material | A380 Aluminum Alloy | Corrosion‑Resistant Coating |
| Seal Material | HNBR / FKM | High Temp & Oil Resistance |
| Operating Temperature | -40°C to +80°C | Continuous Duty |
| Service Interval | 2 years / 2000 hours (typical) | Replace Cartridge Assembly |
| Weight (Complete) | 2.8 kg | Includes Mounting Bracket |
| Compatible SANY Models | SY Series, SYM Series, SYL Series | Verify with VIN or Chassis |
Replacing the HQ3555015SQ38 Filter Dryer is a service task that requires proper depressurization of the air system. Begin by parking the vehicle on a level surface, applying the parking brake, and chocking the wheels. Drain all air reservoirs completely to ensure zero pressure in the system. Disconnect the electrical connector from the purge solenoid. Mark and disconnect the air lines from the dryer inlet, outlet, and purge exhaust. Remove the mounting bolts securing the dryer to its bracket. Clean the mounting surface thoroughly. Install the new genuine HQ3555015SQ38 unit, torquing the mounting bolts to the specification in the service manual (typically 12‑18 Nm).
Reconnect the air lines, ensuring they are fully seated and the O‑rings are undamaged. Reconnect the electrical harness. Close the reservoir drains. Start the engine and allow the system to build pressure; listen for any air leaks and verify the purge cycle operates correctly (a brief puff of air every 60‑90 seconds during compressor unload). A successful installation restores full drying and filtration performance.
The HQ3555015SQ38 is a direct OEM replacement, but compatibility must be verified. While it is the standard dryer for many SANY heavy‑duty trucks, some models may require different port orientations or heater options. Always cross‑reference the part number HQ3555015SQ38 with your vehicle’s VIN or the original equipment part label. Using the correct dryer ensures proper purge timing and check valve function. SANY recommends replacing the complete dryer assembly at the specified interval; however, the spin‑on cartridge version allows the desiccant and filter to be replaced while reusing the head.
Always use a new gasket or O‑ring when servicing the cartridge. Never attempt to rebuild the dryer with non‑genuine desiccant; the bead size and chemical formulation are specific to the HQ3555015SQ38 and affect dew point performance.
Before installing the new HQ3555015SQ38, inspect the compressor discharge line for carbon buildup or excessive oil. A contaminated discharge line can quickly saturate a new desiccant bed. If oil is visible, the compressor may need service and the line should be cleaned or replaced.
Moisture in compressed air condenses and freezes in cold weather, locking brake valves and causing complete brake system failure. The HQ3555015SQ38 suppresses dew point to -40°C, ensuring that no liquid water remains to freeze. This reliability is essential for winter operations in northern climates and mountainous terrain.
Oil aerosol from the compressor attacks rubber seals, causing them to swell and deteriorate. It also varnishes internal passages in valves and air dryers. The 99.97% efficient coalescing filter in the HQ3555015SQ38 removes virtually all oil, protecting downstream components and extending the life of the entire pneumatic system.
Water in the air system causes rust inside steel air tanks, lines, and valve bodies. Rust particles then migrate through the system, scuffing seals and clogging orifices. By delivering completely dry air, the HQ3555015SQ38 halts this corrosion cycle, preserving the integrity of reservoirs and extending component life by years.
Clean, dry air is the lifeblood of pneumatic controls. The HQ3555015SQ38 removes abrasive dust and moisture that cause valves to stick, diaphragms to harden, and O‑rings to fail. Fleet data shows that vehicles equipped with a properly functioning SANY air dryer experience 50‑70% fewer pneumatic valve failures compared to those without.
The HQ3555015SQ38 is the only air dryer validated to SANY’s specific purge volume, flow capacity, and dew point requirements. It is covered by the manufacturer’s warranty and supported by a global service network. Using a genuine part ensures that your truck’s braking system remains compliant with all safety regulations and that no warranty claims are voided.
A failing filter dryer sends clear distress signals. The most common sign is the presence of water in the air reservoirs – check the reservoir drain valves; if water comes out, the desiccant bed is exhausted. You may also notice oil or sludge in the reservoirs, indicating the coalescing filter is saturated. Audible clues include the purge valve exhausting continuously or failing to exhaust at all, and a hissing leak from the dryer body.
On vehicles with a heated dryer, an inoperative heater will cause ice formation around the purge exhaust in freezing weather. The vehicle’s brake warning light may illuminate if system pressure drops below normal. Visually inspect the dryer for external damage or corrosion. If the desiccant cartridge has exceeded its recommended service interval (typically two years), it should be replaced preventively, even without obvious symptoms.
Ignoring these warning signs invites system‑wide failure. Wet air causes rapid corrosion of air tanks; rust particles can lodge in brake valves, causing them to stick open or closed – a direct safety hazard. Oil contamination leads to swollen seals and ultimately complete valve seizure. The cost of replacing a single multi‑circuit protection valve or treadle valve far exceeds the price of a new genuine HQ3555015SQ38 dryer. Proactive replacement is the most cost‑effective maintenance strategy.
To maximize the service life of your HQ3555015SQ38, adhere to these maintenance guidelines. Daily – drain the air reservoirs completely to remove any accumulated moisture; this reduces the workload on the dryer. Monthly – inspect the dryer for physical damage and listen for purge cycle operation.
Annually – replace the spin‑on cartridge or complete dryer assembly according to the severe‑service schedule. Always use only genuine SANY replacement cartridges; the desiccant quantity and grade are precisely matched to the HQ3555015SQ38 head. Keep the dryer exterior clean; mud and debris can insulate the heater and corrode the housing.
If the vehicle is equipped with an electronic dryer timer, have the control module diagnosed during routine electrical system checks. A faulty timer can cause the purge valve to stay open, wasting air and preventing the dryer from regenerating. Store spare HQ3555015SQ38 cartridges in a cool, dry environment; activated alumina will adsorb moisture from ambient air if left unsealed, reducing its effectiveness when installed. By integrating these simple practices into your preventive maintenance program, the SANY air dryer will deliver reliable, dry air for many thousands of miles.
The aftermarket is flooded with “will‑fit” air dryers that claim to match the SANY HQ3555015SQ38. In reality, these products are assembled from off‑the‑shelf components that have never been tested together. Their desiccant is often low‑grade, with high dusting tendency and poor crush strength; this dust migrates downstream, clogging valves.
Their coalescing filters may have lower efficiency, allowing oil to pass. Their solenoid valves may not be sealed against the environment, failing prematurely. The purge timing may be incorrect, either wasting excessive air or failing to regenerate the bed. And there is no warranty coverage or engineering support.
The genuine SANY HQ3555015SQ38 is the result of thousands of hours of laboratory and field validation. It is the only air dryer calibrated to the exact compressor output and duty cycle of SANY trucks. It is the only dryer whose desiccant volume, flow path, and purge orifice are matched to deliver -40°C dew point at the specified flow rate.
When you choose the HQ3555015SQ38, you are not simply buying a part – you are buying the assurance that your truck’s braking system will perform safely and reliably in any condition. For fleet managers who understand that downtime is the true cost, and for owner‑operators who place their lives and livelihoods on the line every day, the genuine SANY filter dryer is the only rational choice.
How often should I replace the HQ3555015SQ38 desiccant cartridge?
SANY recommends replacement every two years or 2000 operating hours in normal service. In severe environments (high humidity, heavy oil carryover), replace annually. Always follow the restriction indicator or reservoir water check.
Can I rebuild the dryer with bulk desiccant?
No. The dryer is engineered as a system; the desiccant bed depth, bead size, and filter placement are all critical. Using bulk desiccant will not achieve the correct dwell time or dew point and may allow dust to escape. Always use a genuine SANY cartridge.
What causes oil to pass through a new dryer?
Oil carryover is usually caused by a worn air compressor, not a defective dryer. If you observe oil in the reservoirs after installing a new HQ3555015SQ38, the compressor should be inspected and repaired. The dryer is a filter, not an oil eliminator for a failed compressor.
Does the HQ3555015SQ38 require a heated version for cold climates?
For continuous operation below -20°C, the heated version with an integrated 24V heater is recommended. The standard dryer will still dry the air, but the purge exhaust may ice up, preventing regeneration. Check your vehicle’s original equipment specification.
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