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XCMG Truck-mounted crane High-pressure gear pump assembly 803007769
Included Components List
High-pressure gear pump main body × 1 unit
Welded flange and fitting for suction/inlet port × 1 set
High-pressure flange fitting for discharge/outlet port × 1 set
High-temperature resistant NBR O-rings × 2 (for flange connection sealing)
High-strength fastening bolts, spring washers, and nuts × 1 set
Installation Location and Associated Assemblies
1. Power Input End: Connects directly via a splined shaft into the PTO located next to the truck transmission.
2. Hydraulic Inlet: Connects to the truck-mounted hydraulic oil tank via a large-diameter oil line.
3. Hydraulic Outlet: Connects to the multi-way hydraulic control valve located beneath the crane control station via a high-pressure hose.
Core Functions and Technical Features
1. High-Pressure Gear Structure: Compared to traditional low-pressure models, this new high-pressure gear pump features optimized internal gear meshing surfaces and end-face clearance compensation, enabling it to maintain stable system operating pressure under extremely high loads.
2. Hydraulic Power Source for the Superstructure: Driven by the engine via the chassis Power Take-Off (PTO), the pump converts mechanical energy into high-pressure hydraulic energy. It continuously supplies hydraulic fluid to the superstructure's multi-way control valve, thereby powering the truck-mounted crane's boom extension/retraction, luffing (lifting/lowering), hook hoisting, and 360-degree slewing mechanisms.
3. Complete Assembly: In addition to the gear pump unit itself, the package includes dedicated inlet and outlet flange fittings, seals, and mounting bolts, facilitating direct, all-in-one replacement during servicing.
Common Faults
1. Weak lifting or slow operation: If the hydraulic oil contains fine silt or debris, it can easily cause wear on the internal side plates and housing of the gear pump (leading to internal scoring and excessive leakage), preventing the system from building up sufficient pressure.
2. Abnormal noise at the PTO (Power Take-Off): Usually caused by mechanical noise resulting from wear on the gear pump's input shaft splines or a seized internal bearing.
Replacement Tips
1. When replacing this new high-pressure gear pump, you must thoroughly clean the hydraulic oil tank and replace the hydraulic return filter element.
2. If the hydraulic oil has turned black or contains metal shavings, the entire system's hydraulic oil must be replaced; otherwise, the new pump is likely to suffer wear and failure again within a short period.
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