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Welcome to this critical, in-depth guide on the FAW Transmission Housing Assembly, the complete structural “skeleton” for the gearbox in the FAW Jiefang CA4251P66K24T1A3E5 6×4 diesel semi-trailer tractor. This is the foundation upon which the entire transmission is built.
O FAW Transmission Housing Assembly is not a single part, but a set of precision-machined casings, including the ‘Front housing’ (1701015-A9P) and ‘Mid-housing’ (1701035-A9P). Its function is to contain the gear oil, protect all internal gears and shafts, and provide rigid mounting points to the engine and chassis.
This guide is an essential resource for professional transmission rebuilders, fleet technicians, and parts managers. We will deconstruct the entire FAW Transmission Housing Assembly into its 37 serviceable components, including every cover, plugue, gasket, and fastener required for a complete overhaul.
O FAW Transmission Housing Assembly é a “two-piece” ou “split-case” design, consisting of two main structural components.
**1. Carcaça frontal (1701015-A9P):** This is the ‘Front housing with steel wire sleeve assy’. This is the “bell housing” section of the FAW Transmission Housing Assembly. Its primary function is to connect the entire gearbox to the back of the engine’s flywheel housing. It also contains the clutch release mechanism (fork and bearing). O “steel wire sleeve” (Por exemplo, Helicoil) designation is a high-quality feature, indicating that the aluminum casting has been reinforced with steel thread inserts for the high-torque mounting bolts, preventing stripping and ensuring durability.
**2. Mid-Housing (1701035-A9P):** This is the ‘Mid-housing with steel wire sleeve assy’. This is the main “caixa de câmbio,” the largest part of the FAW Transmission Housing Assembly. This heavily-ribbed casting (likely aluminum for light weight and heat dissipation) is the “skeleton” that holds all the critical, torque-bearing shafts: the main shaft, the counter-shaft, and the reverse idler shaft. Its internal, precision-bored “saddles” are where the main shaft bearings are seated.
These two halves of the FAW Transmission Housing Assembly are located with ‘Dowel pins’ (1701052-A9P, 1701037-A2K) and bolted together with numerous high-tensile ‘Hex flange bolts’ (Q1840820S, Q1841030S, etc.) to form a single, rigid, leak-proof unit.
O FAW Transmission Housing Assembly is designed for serviceability. This is evident from its multiple access covers. The ‘Cover – upper left’ (1701037-A9P) and ‘Cover – canto inferior direito’ (1701043-A9P) are “idler gear” covers. They seal the large holes in the casing that are necessary for the factory to assemble the counter-shaft and idler gear clusters. These covers are sealed with gaskets and secured with ‘Hex flange bolts’ (Q1841060S, Q1841065S).
Adicionalmente, the ‘Front housing’ (bell housing) features a ‘Cover – outer observation hole’ (1601042-A2K), which is sealed by a ‘Gasket’ (1601041-A2K). This small, removable plate is the “clutch inspection cover.” It allows a technician to use a light and a mirror to inspect the condition of the clutch friction disc, the pressure plate, and the release bearing, without having to remove the entire transmission. This is a critical diagnostic feature of the FAW Transmission Housing Assembly.
O FAW Transmission Housing Assembly is also a “sump” that holds several gallons of heavy-duty gear oil. This parts list details all the service points for this fluid.
**1. Filler Plugs:** The ‘Oil filler plug’ (1701042-A2K) is the main “fill” port, located high on the side of the FAW Transmission Housing Assembly. The transmission is filled until oil begins to weep from this hole, which is how the correct level is set.
**2. Drain Plug:** The ‘Drain plug assy’ (1701765-A2K) is the service point for removing the old oil. This plug is located at the absolute lowest point of the FAW Transmission Housing Assembly. It is magnetic, designed to trap microscopic metal particles and provide a visual “health check” of the internal gears during an oil change. It is sealed with a ‘Gasket-plug, drain’ (1701042-A2K… *Correction*: 1701042-A2K is listed as filler plug and gasket, likely a typo in list, should be drain plug gasket 1701765-A2K’s sub-part).
**3. Oil Sump:** The ‘Oil sump assembly’ (1701025-A9P) is a bolted-on component at the bottom of the FAW Transmission Housing Assembly. This acts as the main oil reservoir, ensuring the oil pump pickup is always submerged.
The most critical function of the FAW Transmission Housing Assembly is to hold the input, main, and counter shafts in perfect, parallel alignment under thousands of pound-feet of torque. This is achieved by several key components.
The ‘End cap – intermediate shaft front bearing’ (1701028-A9P) is a heavy-duty cap that bolts to the front of the main housing, securing the “pocket bearing” of the counter-shaft. De forma similar, the ‘Cover – Rolamento traseiro do primeiro eixo’ (1701141-A7G) and its ‘Gasket’ (1701142-A7G) seal and secure the main bearing on the transmission’s output shaft.
Esse FAW Transmission Housing Assembly also provides the mounting points for the shift-fork shafts. The ‘Bushing-shift fork shaft’ (1701013-A9P) and ‘Bushing-reverse idler shaft’ (1701014-A9P) are the “wear” surfaces. These bronze bushings are pressed into the case, providing a low-friction, replaceable surface for the hardened steel shift shafts to slide in.
The following table provides the complete, detailed breakdown of all 37 components for the FAW Transmission Housing Assembly.
| Mark | Parte não. | Nome da peça | Quantidade |
|---|---|---|---|
| 1 | 1701035-A9P | Mid-housing with steel wire sleeve assy | 1 |
| 2 | Q1840820S | Hex flange bolt, coarse rod (Tipo padrão) | 8 |
| 3 | 1701037-A9P | Cobrir – upper left | 1 |
| 4 | 1701052-A9P | Dowel pin-sub housing | 2 |
| 5 | 1701042-A2K | Gasket-plug, drain | 1 |
| 6 | 1701041-A2K | Bujão de enchimento de óleo | 1 |
| 7 | 1701765-A2K | Drain plug assy | 1 |
| 8 | Q214046 | Cross head screw | 1 |
| 9 | 1701046-A9P | Placa de nome de transmissão | 1 |
| 10 | 1701025-A9P | Oil sump assembly | 1 |
| 11 | CQ1500825 | Hex head bolt | 2 |
| 12 | 1701037-A2K | Dowel pin | 2 |
| 13 | Q18410110S | Hex flange bolt, coarse rod (Tipo padrão) | 4 |
| 14 | 1701028-A9P | End cap – intermediate shaft front bearing | 1 |
| 15 | Q1841030S | Hex flange bolt, coarse rod (Tipo padrão) | 4 |
| 16 | 1701142-A7G | Junta – first shaft bearing cap | 1 |
| 17 | 1701141-A7G | Cobrir – Rolamento traseiro do primeiro eixo | 1 |
| 18 | Q1841030S | Hex flange bolt, coarse rod (Tipo padrão) | 6 |
| 19 | Q1841030S | Hex flange bolt, coarse rod (Tipo padrão) | 4 |
| 20 | 1701028-A9P | End cap – intermediate shaft front bearing | 1 |
| 21 | 1701015-A9P | Front housing with steel wire sleeve assy | 1 |
| 22 | 1601041-A2K | Junta – outer observation hole cover | 1 |
| 23 | 1601042-A2K | Cobrir – outer observation hole | 1 |
| 24 | Q40306 | Spring gasket | 2 |
| 25 | CQ1500616 | Hex head bolt | 2 |
| 26 | 1701013-A9P | Eixo do garfo de mudança de bucha | 7 |
| 27 | Q1840820S | Hex flange bolt, coarse rod (Tipo padrão) | 8 |
| 28 | 1701043-A9P | Cobrir – canto inferior direito | 1 |
| 29 | Q1841065S | Hex flange bolt, coarse rod (Tipo padrão) | 1 |
| 30 | Q1841060S | Hex flange bolt, coarse rod (Tipo padrão) | 20 |
| 31 | 1701047-A9P | Placa de nome de transmissão | 1 |
| 32 | 1701711-A2K | Lifting eye | 1 |
| 33 | Q2140610 | Cross head screw | 4 |
| 34 | CQ1211640 | Stud bolt | 3 |
| 35 | Q40316 | Spring gasket | 3 |
| 36 | CQ34116 | Noz hexadecimal | 3 |
| 37 | 1701014-A9P | Bushing-reverse idler shaft | 1 |
The specifications for the FAW Transmission Housing Assembly are defined by its function as the structural, precision-machined skeleton for a heavy-duty manual transmission. The entire FAW Transmission Housing Assembly is built for durability.
| Vehicle Application | FAW Jiefang CA4251P66K24T1A3E5 6×4 Tractor |
| Component Group | FAW Transmission Housing Assembly |
| Housing Type | Two-Piece (Split-Case) Projeto |
| Carcaça frontal (Bell Housing) | 1x (Parte não. 1701015-A9P) |
| Main Housing (Mid-Case) | 1x (Parte não. 1701035-A9P) |
| Material (Typical) | Cast Aluminum (with Steel Wire Thread Inserts) |
| Service Points | Plugue de preenchimento de óleo (1701041-A2K), Drain Plug (1701765-A2K) |
| Inspection Port | 1x Clutch Observation Cover (1601042-A2K) |
| Shift Shaft Mounts | Bronze Bushings (1701013-A9P, 1701014-A9P) | Tipo
| Primary Function | To house, protect, and lubricate all transmission gears and shafts, and to ensure their perfect alignment. |
FAW parts, including the Cylinder Block Assembly, are packaged with care to ensure safe delivery. Each component is secured in protective materials to prevent damage during transit. The logistics network guarantees timely shipments worldwide, supporting efficient maintenance operations. Below is an image illustrating the standard packaging for FAW truck parts, showcasing the attention to detail in handling and storage.
This packaging approach minimizes the risk of corrosion or impact damage, ensuring that parts like the FAW Cylinder Block Assembly arrive in perfect condition. Customers can rely on FAW’s logistics for consistent quality and reliability.
FAW é um dos maiores e mais antigos fabricantes automotivos da China, com capital social de RMB 35.4 bilhões de yuans e ativos totais de RMB 457.83 bilhão de yuans.
CHINA FAW GRUPO CO., LTDA. (abreviação de FAW), anteriormente China First Automobile Works, pode traçar suas raízes até julho 15, 1953, quando sua primeira montadora começou a ser construída. FAW é um dos maiores e mais antigos fabricantes automotivos da China, com capital social de RMB 35.4 bilhões de yuans e ativos totais de RMB 457.83 bilhão de yuans.
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