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HOWO 371 HOWO 380 Sanitation Vehicle Sweeper-Scrubber Spray Boom Arm Assembly
Core Components
The spray bar assembly of a street washer-sweeper is not a single part but a complex unit integrating mechanical, hydraulic, and water-delivery systems.
1. Mechanical Arm Structure (Main Arm Body): Fabricated from high-strength Q345B carbon steel via bending and welding; designed to withstand prolonged exposure to high-pressure water spray and road grime.
2. Hydraulic Actuation Cylinders: Equipped with folding and lifting cylinders to control the lateral deployment and retraction of the spray bar, as well as the adjustment of its overall ground clearance.
3. High-Pressure Spray Bar Piping: A main water pipe mounted on the arm, featuring precisely spaced ports for the installation of high-pressure ceramic nozzles.
4. Anti-Collision and Shock-Absorption Mechanism: The end of the arm typically incorporates a spring-loaded obstacle-avoidance or anti-collision swing-arm design. If the arm scrapes against a curb or obstacle during sweeping operations, it automatically retracts or pivots backward to avoid damage, preventing structural deformation.
Common Failure Symptoms and Root Causes (Spray Bar Arm Assembly)
| Failure Symptom | Potential Root Causes | Troubleshooting & Maintenance Advice |
|---|---|---|
| Arm fails to deploy or retract | Hydraulic multi-way valve jammed; control solenoid valve burnt out; internal leakage in the folding hydraulic cylinder. | Check if there is an electrical signal output from the cabin switch; measure whether the solenoid coil of the corresponding hydraulic valve is intact. |
| Uneven high-pressure water spray / Localized no-water | High-pressure nozzles on the arm are clogged with silt or sand, or the ceramic nozzles are worn and deformed. | Remove the end nozzles and clear them with a fine needle, or replace them entirely; always clean the vehicle's fresh-water filter before operation. |
| Arm sagging / Severe shaking during transit | Excessive play caused by severe wear on the composite bushings and pins at the arm joints; deformed mechanical locking hook. | Replace the worn pins and copper bushings; regularly inject grease into each lubrication point (grease nipples) of the arm. |
| Structural cracking or fracturing | Reckless driving during sweeping operations resulting in a severe impact between the spray bar and the curb; metal fatigue from high-pressure pulsation. | Perform local realignment followed by reinforcement welding; replace the entire left/right arm section frame if necessary. |
DETAILS
| DESCRIPTION | Forklift Mast Roller Bearing | PART NUMBER | 180705KT |
| WEIGHT | 0.42 kg | VOLUME | d/Inner Diameter 25.00mm D/Outer Diameter 80.00 mm B/Width 22.00 mm |
| TRUCK MOLDE | QUALITY | Copy,High Copy, OEM,Original | |
| MOQ | 1 | WARRANTY | 1 year |
| PAYMENT | TT/WESTEN UNION | SHIPMENT | by air/sea/railway |
| BRAND | SINOSACHS | PLACE OF ORIGIN | JINAN CITY,CHINA |
| STOCK | IN STOCK | APPLICABLE SITE |
|
| PACKAGE | Carton/Woodenbox | PORT OF LANDING | Qingdao Port,China |
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