29547630 Main housing Allison spare parts

29547630 Main housing Allison spare parts

The 29547630 main housing is an OE-grade core load-bearing component specifically developed for Allison 3000/4000 series (3000HS/3200HS/4000HS/4500HS/ORS) heavy-duty automatic transmissions. This product is widely used in heavy-duty equipment equipped with this series of transmissions, such as heavy-duty trucks, mining dump trucks, port tractors, construction machinery, and oilfield special vehicles. It is crucial for the positioning, installation, and load-bearing of the internal clutch assembly (C3/C4, etc.), planetary gear set, main oil pump, and retarder hydraulic module. It integrates the main oil circuit, shift control oil passage, and retarder cooling oil passage, directly connecting to the torque converter housing, tail housing, and side covers to form the core rigid frame of the transmission. This ensures precise power transmission, reliable hydraulic system sealing, significantly reduces housing cracking, deformation, oil leakage, and other faults, and extends the overall service life of the transmission.

Core technical parameters:

– Product Model: 29547630
– Material Specifications: Body (high-strength ductile iron QT600-3, quenched and tempered heat treatment, hardness HB 180~220); Valve seat/bearing housing (40Cr insert, wear-resistant and impact-resistant); Seals (fluororubber/FKM); Surface (electrophoretic anti-corrosion + wear-resistant coating for the inner cavity)
– Operating environment: Operating temperature -40℃~190℃
– Mechanical and sealing performance: tensile strength ≥600MPa, yield strength ≥370MPa, torsional stiffness ≥8000N·m/°, impact toughness ≥15J (-20℃), can withstand 3200N·m input torque impact; static leakage rate ≤5×10⁻⁷Pa·m³/s, sealing test pressure ≥4.0MPa, maximum working pressure 20MPa, flow channel resistance loss ≤5%.
– Precision and structural parameters: Clutch chamber/planetary carrier stop coaxiality ≤0.015mm; mating surface flatness ≤0.01mm; mounting hole position accuracy ≤0.02mm; valve hole tolerance ≤±0.005mm; input end stop diameter: 3000 series Φ447.7±0.05mm, 4000 series Φ511.2±0.05mm; mounting bolt torque: main bolt 45~50N·m, side cover bolt 30~35N·m.
– Structural features: Integrated C3/C4 clutch chamber, planetary carrier mounting position, and main oil pump bearing housing; built-in main oil circuit/shift oil passage/retarder oil passage; reserved PTO mounting position and temperature/pressure sensor interface; M20×1.5 drain port, 1/8″ NPT pressure test port, one-stop solution to meet the gearbox load-bearing, hydraulic control and installation requirements.
– Compatible Models/Scenarios: Core compatibility with Allison 3000HS/3200HS/4000HS/4500HS/ORS series automatic transmissions, widely used in scenarios such as heavy-duty trucks going downhill, heavy-duty transportation in mines, frequent start-stop operations in ports, construction machinery, and special vehicles in oil fields. It is also suitable for needs such as transmission overhaul, housing crack replacement, and hydraulic system upgrades, and is suitable for complex working scenarios with heavy loads, high-frequency vibrations, and lots of oil contamination.
– Service life: ≥30,000 hours under normal heavy load conditions, with fatigue cycles ≥10⁶.

The 29547630 main housing, with its precise original factory fit, high rigidity and deformation resistance, precise positioning, and long-lasting sealing properties, has become the core preferred component for overhauling and replacing housings of Allison 3000/4000 series heavy-duty transmissions. We strictly control the entire production process; each product undergoes non-destructive testing (RT/PT), precision inspection, hydraulic seal testing, vibration fatigue testing, and high/low temperature aging testing to ensure compliance with original factory standards, GB/T 31400, GB/T 18276-2017, and ASTM A536 standards. We also provide comprehensive after-sales support and standardized packaging for bulk purchases, along with installation torque and sealing assembly guidelines. Suitable for repair shops, transmission overhaul centers, and heavy-duty vehicle fleets requiring bulk use, it helps heavy-duty equipment transmissions achieve long-term stable and efficient operation.

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