FAW J6P Sub-Enclosure: Deconstructing 22 Critical Parts for Flawless Drivetrain Integrity

Welcome to this expert analysis of the FAW J6P Sub-Enclosure, the foundational housing for the CA10TA160M auxiliary gearbox. This component is essential for the FAW Jiefang CA3250P66K2L1T1E 6×4 dump truck. This guide analyzes the 22 part types that seal, support, and complete the FAW J6P Sub-Enclosure (with PTO) for professional service.

The FAW J6P Sub-Enclosure is the “chassis” of the 10-speed transmission’s range box. Its logic is to provide a perfect, rigid alignment for the high-torque auxiliary countershafts and the main spindle. It also contains the oil and provides the mounting point for the critical Power Take-Off (PTO) unit.

Core 1: The “Structural” Logic (The FAW J6P Sub-Enclosure & PTO)

This group contains the main structural casting, the “chassis” of the auxiliary gearbox, and the lifting lug used to service it. The FAW J6P Sub-Enclosure is the literal foundation.

1. Component: ‘Sub-box housing’ (1701501AA1K)
This (Comp 2) is the FAW J6P Sub-Enclosure itself. This is a massive, complex component, precision-cast from high-strength iron or aluminum. Its logic is threefold: alignment, sealing, and heat dissipation.

The Alignment Logic is its most critical function. This main case has multiple, perfectly parallel bores machined into it to hold the bearings for the ‘Sub-Box Spindle’ and the various countershafts (like the ‘Left Upper’ and ‘Right Lower’ shafts). Any warping or damage to the FAW J6P Sub-Enclosure will cause shaft misalignment, leading to rapid gear and bearing failure.

The Sealing Logic is its obvious function. It acts as a large “sump” or “oil bath” for the auxiliary gear set. It is designed with multiple machined faces for gaskets (like Comp 1, 7, 21) to create a leak-proof enclosure.

The PTO Port Logic is its special feature. The note “(带取力器)” (with PTO) on the diagram title confirms this FAW J6P Sub-Enclosure is cast with a standardized 6-bolt or 8-bolt “window” or “aperture” on the side. This port is designed to mount the truck’s hydraulic pump PTO, allowing the gearbox to power the dump body.

2. Component: ‘Lifting lug’ (1702096-A7G)
This (Comp 18) is a heavy-duty steel bracket bolted to the top of the FAW J6P Sub-Enclosure (using bolts Comp 19).

The Service Logic is its function. A complete transmission assembly is extremely heavy. This ‘Lifting lug’ provides a secure, balanced attachment point for an engine hoist or chain, allowing technicians to safely remove and install the entire gearbox from the truck’s chassis.

Core 2: The “Output Shaft Seal” Logic (Spindle Interface)

This group is dedicated to sealing the largest, most critical rotating component of the FAW J6P Sub-Enclosure: the final output shaft (spindle).

1. Component: ‘Rear bearing cover – sub-box output shaft’ (1701586-A7K)
This (Comp 8) is the main bearing retainer for the ‘Sub-Box Spindle’. It is a large, cast cover that bolts to the very back of the FAW J6P Sub-Enclosure (using bolts Comp 16).

The Bearing Pre-load Logic is this cover’s primary job. It “traps” the outer race of the ‘Double-row tapered roller bearing’ (from the Spindle assembly). The ‘Gasket – output shaft’ (Comp 7) sits between this cover and the main housing, and its thickness is critical for setting the spindle’s bearing pre-load.

2. Component: ‘Oil seal assy’ (1701605-A7G)
This (Comp 15) is the main output shaft oil seal. It is pressed *into* the ‘Rear bearing cover’ (Comp 8).

The Sealing Logic is this component’s “no-fail” function. It is the final, dynamic seal of the entire drivetrain. Its flexible lip rides on the spinning ‘Output flange’ (from the Spindle assembly). Its logic is to keep 100% of the gear oil *inside* the FAW J6P Sub-Enclosure while keeping 100% of road dirt, water, and debris *out*. A failure here results in a major, high-speed oil leak.

Core 3: The “Countershaft Pre-load” Logic (The Shim Stack)

This group contains the hardware for sealing and, most importantly, setting the pre-load for the auxiliary countershafts (like the ‘Left Upper’ and ‘Right Lower’ shafts) as they mount into the FAW J6P Sub-Enclosure.

1. Component: ‘Rear bearing cover – sub-box intermediate shaft’ (1701521-A7G)
This (Comp 20) is the bearing retainer for one of the countershafts. It is a cover that bolts to the FAW J6P Sub-Enclosure, “trapping” the outer race of the shaft’s tapered roller bearing.

2. Component: ‘Gasket – sub-box intermediate shaft’ (1701523-A7G)
This (Comp 21) is the paper or cork gasket that seals the ‘Bearing cover’ (Comp 20) to the FAW J6P Sub-Enclosure, preventing oil leaks from the bearing bore.

3. Component: ‘Adjusting gasket (shim) – sub-box intermediate shaft’ (Comp 22)
This (Comp 22) represents a large set of ‘Adjusting gaskets’, or “shims,” of various, precisely-controlled thicknesses (e.g., 1701526-A7G, 1701527-A7G, etc.). They are listed as “As required.”

The Pre-load Logic is the most high-precision task in servicing the FAW J6P Sub-Enclosure. Tapered roller bearings on the countershafts require a specific “pre-load” (squeeze) to function. A technician assembles the shaft, measures the “end play” with a dial indicator, and then selects *one* shim (or a stack) from this group.

This shim (Comp 22) is placed *between* the ‘Bearing cover’ (Comp 20) and the ‘Gasket’ (Comp 21). Its exact thickness is what “sets” the bearing pre-load. Using the wrong shim will cause the bearing to fail very quickly. This makes the FAW J6P Sub-Enclosure a high-precision item to service.

Core 4: The “Speedometer & Fastener” Logic (All Hardware)

This final group includes all the miscellaneous hardware that completes the FAW J6P Sub-Enclosure assembly, from the speedometer drive to the myriad of fasteners.

1. The “Speedometer” Group (Comp 9, 10, 11, 12, 13, 14)
This is the complete assembly for the mechanical speedometer drive. It includes the ‘Lever – for speedometer drive’ (Comp 9), the ‘Joint – speedometer flexible shaft’ (Comp 11), a ‘Fastening screw’ (Comp 14), and ‘O-ring seals’ (Comp 10, 12) with a ‘Spring washer’ (Comp 13) for the screw.

The Drive Logic is how the truck’s dashboard gets its speed reading. A plastic “speedo gear” (on the Sub-Box Spindle) spins the ‘Lever’ (Comp 9). This ‘Lever’ (or drive gear) is housed in the ‘Joint’ (Comp 11), which is a 90-degree adapter that bolts to the FAW J6P Sub-Enclosure. The truck’s flexible speedometer cable then screws onto this ‘Joint’.

The Sealing Logic for this sub-assembly is the job of the two ‘O-ring rubber seals’ (Comp 10 and 12). These are critical for preventing gear oil from wicking up the speedometer drive and leaking out of the FAW J6P Sub-Enclosure.

2. The “Fastener & Sealing” Group (All Others)
This group contains all the hardware (Comp 1, 3, 4, 5, 6, 16, 17, 19) that holds the FAW J6P Sub-Enclosure together.

The Fastener Logic includes a large assortment of high-tensile bolts: ‘Hexagon head bolt with guide neck’ (Comp 4, 5, 6) and ‘Hexagon flange bolt’ (Comp 16, 17, 19). The “guide neck” bolts are for high-precision alignment of bearing covers. The “flange” bolts have a built-in washer to resist vibration.

The Sealing Logic is provided by ‘Gasket’ (Comp 1), ‘Gasket – output shaft’ (Comp 7), and the ‘Spring washers’ (Comp 3). The gaskets provide the “static seal” between flat, metal surfaces. The 19 ‘Spring washers’ (Comp 3) are the primary “anti-vibration” logic, providing constant tension on the bolts to prevent them from backing out and causing a catastrophic oil leak or misalignment of the FAW J6P Sub-Enclosure.

FAW J6P Sub-Enclosure: Complete 22-Part Breakdown

The following table provides the complete, detailed breakdown of all 22 component types in the FAW J6P Sub-Enclosure assembly for the FAW Jiefang CA3250P66K2L1T1E 6×4 dump truck.

Core Specifications

The specifications for the FAW J6P Sub-Enclosure are defined by its role as the primary structural, alignment, and sealing component for the auxiliary (range) gearbox.