Description
CAT 439-7224 Diaphragm Pump
| CAT 439-7224 Diaphragm Pump |
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The CAT 439-7224 is a Caterpillar original equipment twin-cylinder air-cooled air compressor assembly, compatible with Cat C13, C15, C18 and other heavy-duty diesel engines. It provides compressed air for vehicle braking systems, pneumatic control components, and auxiliary air equipment. The following is raw data and does not include information on replacement parts.
Core Technical Parameters (Raw Data)
Item Details Basic Attributes Model 439-7224, Type: Twin-cylinder air-cooled reciprocating piston air compressor, Material: Cylinder block/cylinder head is gray cast iron (HT250, hardness HB190-240), piston is forged aluminum alloy (6061-T6, hardness HB95-110), crankshaft is 42CrMo alloy steel (quenched hardness HRC52-58), connecting rod is 40Cr alloy steel (tempered hardness HB220-250), Single weight 28.5 kg, Rated displacement 420 L/min (at engine speed 1800 rpm), Rated working pressure 10 bar (1 MPa), Maximum working pressure 12 bar (1.2 MPa), Working temperature -40℃ to +120℃, Lubrication method: Pressure lubrication (compatible with SAE 15W-40 diesel engine oil), Drive method: Gear transmission (gear ratio…) 1:1.8), Protection Rating IP54
Key Dimensions: Cylinder Bore φ90 mm (Tolerance +0.010/-0 mm), Piston Stroke 70 mm (Tolerance ±0.10 mm), Cylinder Center Distance 110 mm (Tolerance ±0.15 mm), Crankshaft Main Journal Diameter φ65 mm (Tolerance -0.010/-0.020 mm), Crankshaft Connecting Rod Journal Diameter φ55 mm (Tolerance -0.010/-0.020 mm), Compressor Overall Length 520 mm (Tolerance ±1.0 mm), Overall Width 280 mm (Tolerance ±1.0 mm), Overall Height 310 mm (Tolerance ±1.0 mm), Mounting Hole Center Distance 220 mm (Tolerance ±0.20 mm)
Performance Parameters: Exhaust Pressure Range 0-10 bar (adjustable), Exhaust Temperature ≤180℃ (Ambient Temperature) At 25℃, volumetric efficiency ≥85% (rated operating conditions), specific power ≤6.5 kW/(m³/min), crankshaft speed ≤3200 rpm, continuous operating time ≥8000 hours, vibration acceleration ≤5 m/s², noise ≤95 dB (at 1 m distance).
Structural and Performance Advantages:
Twin-cylinder air-cooled design: The twin-cylinder structure increases displacement, and air cooling eliminates the need for an additional cooling system, adapting to compact engine installation spaces and reducing system complexity.
High-strength materials: The cylinder block/cylinder head is made of HT250 gray cast iron, which is high-temperature resistant and wear-resistant; the pistons are made of 6061-T6 aluminum alloy, which is lightweight and has good heat dissipation; the crankshaft and connecting rods are made of alloy steel, ensuring the strength and durability of the transmission system.
Pressure lubrication system: Pressure lubrication is provided through the engine oil pump, ensuring sufficient lubrication of moving parts such as the crankshaft and connecting rods, extending service life.
Highly adaptable: Compatible with heavy-duty engines such as Cat C13, C15, and C18, meeting the continuous compressed air requirements of braking systems and pneumatic components, and compatible with various harsh operating conditions.
Installation and Maintenance Points (Original Data)
Installation: Clean the mounting surface (free from oil, rust, and scratches). During installation, ensure the parallelism error between the crankshaft centerline and the engine crankshaft centerline is ≤0.10 mm, and the coaxiality error is ≤0.20 mm. Tighten the bolts to a torque of 120-140 N·m, and ensure the gear meshing clearance is 0.15-0.25 mm. After installation, check for smooth rotation (no jamming or abnormal noise). Connect the intake and exhaust pipes and ensure a seal (no leakage).
Maintenance: Check the air filter every 1000 hours (replace if clogged); check the intake and exhaust valves every 2000 hours (grind or replace if worn); change the compressor oil every 2500 hours (change at the same time as the engine oil); check piston ring wear every 5000 hours (replace if the gap exceeds 0.5 mm); check crankshaft bearing clearance every 8000 hours (replace if it exceeds 0.10 mm).
Troubleshooting: Insufficient exhaust volume is often due to a clogged intake filter or leaking valves; replace the filter or grind the valves. Excessive exhaust pressure is often due to a faulty pressure regulator; replace the pressure regulator. Overheating is often due to poor lubrication or clogged radiator fins; change the engine oil and clean the radiator fins. Abnormal noises are often due to worn bearings or poor gear meshing; replace the bearings or adjust the gear clearance.
