SEARCH FOR YOUR PRODUCT
Brand: C.OEFT
OE numbers: 8870
Product Name: Transmission Valve Body Assembly
Compatible model:
Product status: Remanufactured
Product weight: 6.733KG
Packaging size: 63X41X36cm
Product packaging: Neutral Packaging
Car Series: Japanese
Car Type: for Toyota Crown 300
1. Precise 6-Speed Heavy-Duty Shift Control
Through 6 groups of high-performance solenoid valves (SL1-SL6), it drives the C1-C3 clutches and B1-B3 brakes to realize the switching of 6 forward gears and 1 reverse gear: SL1 controls the C1 clutch (power transmission for 1st/4th gears), SL2 controls the C2 clutch (power transmission for 2nd/5th gears), SL3 controls the C3 clutch (power transmission for 3rd/6th gears), and SL4-SL6 respectively control the B1-B3 brakes (reverse gear and gear locking). Combined with the "heavy-duty reduction ratio optimization" of the planetary gear set (1st gear reduction ratio: 6.8, 6th gear reduction ratio: 0.85), it balances heavy-duty starting power (meeting the starting needs of 100-ton fully loaded heavy-duty trucks) and high-speed cruising economy (engine speed is only 1800rpm when the vehicle speed is 90km/h).
2. Heavy-Duty Adaptive Oil Pressure Regulation
The SLT solenoid valve dynamically adjusts the main line pressure according to engine load (torque signal), vehicle speed, and road conditions (slope sensor signal): it decreases to 1.5MPa under no-load conditions (to reduce energy consumption) and increases to 3.2-3.5MPa when climbing with full load (to ensure power transmission). The ATF pressure switch feeds back oil pressure data every 3ms, forming a closed-loop control. Even during shifting under full load, the pressure fluctuation can be controlled within 0.1MPa, ensuring smooth shifting and avoiding shifting slippage under heavy loads.
3. Shift Logic for Commercial Vehicle Scenarios
Equipped with a three-mode switching function: "Heavy-Duty Mode", "Cruise Mode", and "Climbing Mode". In Heavy-Duty Mode (automatically activated when fully loaded), upshifting is delayed (e.g., the speed for shifting from 2nd to 3rd gear is increased from 40km/h to 45km/h) to enhance power output; in Cruise Mode (vehicle speed 60-90km/h), upshifting is advanced (the speed for shifting from 5th to 6th gear is reduced from 85km/h to 80km/h) to lower the engine speed and save fuel; in Climbing Mode (activated when the slope is >10%), low gears (within 3rd gear) are locked to avoid power interruption caused by frequent shifting, adapting to the mountain transportation scenario of heavy-duty trucks.
1.Precise Matching for Heavy-Duty Power
The 8870 is specifically designed for large-displacement diesel engines with 8-16L displacement, featuring a maximum operating pressure of the valve body increased to 3.5MPa. It can be adapted to power systems with a maximum torque of 2000N・m, perfectly matching the usage scenarios of heavy-duty trucks and large buses, such as "full-load transportation and climbing under heavy load". Compared with peer valve bodies for commercial vehicles in the same class, its power transmission efficiency is improved by 6%. When matched with a heavy-duty truck equipped with a 12L diesel engine, the power response time is shortened by 0.5 seconds when climbing with full load (15% slope), avoiding power lag under heavy-duty conditions and meeting the high-efficiency needs of logistics transportation and long-distance passenger transport.
2.High-Strength Structure for Impact Resistance
It adopts a "double-layer reinforced valve body" structure: the outer layer is made of high-strength cast steel (ZG270-500) with a tensile strength of 500MPa, and its impact resistance is 80% higher than that of ordinary aluminum alloy valve bodies. The key stress-bearing areas in the inner layer (such as solenoid valve mounting seats and oil circuit interfaces) are equipped with additional reinforcing ribs, with the thickness increased to 15mm. It can withstand the instantaneous impact force during heavy-duty shifting (maximum impact pressure up to 4.0MPa), preventing the valve body from deformation or cracking and adapting to the working conditions of frequent heavy-duty shifting for commercial vehicles.
3.Wear-Resistant Design for Core Components
The internal valve core of the valve body adopts the "high-speed steel + nitriding treatment" process (material: W18Cr4V), with a surface hardness of over HRC65, and its wear resistance is 60% higher than that of ordinary alloy steel. The valve sleeve adopts a "copper alloy inlay" structure (ZCuSn10Pb1), which reduces the friction loss between the valve core and the valve sleeve. The service life is extended to more than 500,000 kilometers, far exceeding the average service life of 300,000 kilometers of ordinary commercial vehicle valve bodies, reducing the maintenance and replacement frequency of heavy-duty trucks and buses.
4. Customized Maintenance Design for Commercial Vehicles
The maintenance interval is extended to 100,000 kilometers (compared with 80,000 kilometers for ordinary commercial vehicle valve bodies). Although the ATF oil replacement volume requires 12L, it adopts a "long-life ATF oil compatible design" and can be adapted to CK-4 grade long-life diesel engine oil, reducing the frequency of oil replacement during maintenance. Meanwhile, the side of the valve body is equipped with a "quick inspection window", allowing the detection of solenoid valves and pressure sensors without disassembling the transmission. The maintenance time is shortened to less than 4 hours (ordinary valve bodies require 8 hours), significantly reducing the downtime of commercial vehicles and lowering the loss in logistics transportation.
INQUIRE NOW 
