FAW Rear Housing Assembly: تحليل خبير ل 22 المكونات الأساسية

Welcome to this expert analysis of the FAW Rear Housing Assembly (الجزء لا. 1701505-A9P), the critical “auxiliary box” أو “range box” for the manual transmission in the FAW Jiefang CA4251P66K24T1A3E5 6×4 جرار نصف مقطورة ديزل.

هذا FAW Rear Housing Assembly is the foundation of the transmission’s “splitter” أو “range” قسم. It bolts to the back of the main transmission case and contains the crucial gearset that provides the “high” و “low” ranges, effectively doubling the number of available gears (على سبيل المثال, turning a 6-speed into a 12-speed).

This in-depth guide is an essential resource for professional transmission technicians and parts specialists. سنقوم بتفكيك الكل FAW Rear Housing Assembly فيه 22 مكونات صالحة للخدمة, including the main housing, the output shaft bearings, the critical adjustment shims, and the speedometer drive system.

المكون الأساسي: The Rear Housing Assembly (1701505-A9P)

The foundation of this entire assembly is the ‘Rear housing with steel wire sleeve set assy’ (1701505-A9P). This is the main structural casing of the FAW Rear Housing Assembly (auxiliary box). It is a massive, precision-machined casting, typically made of aluminum to save weight and dissipate heat.

Its function is to house the entire “range” gearset, which includes the range synchronizer and the “high” و “low” ratio gears. It must hold the auxiliary output shaft and auxiliary counter-shaft in perfect, parallel alignment under thousands of pound-feet of multiplied torque.

ال “steel wire sleeve set” designation is a critical, high-quality feature. It means that the high-stress threaded holes in the aluminum FAW Rear Housing Assembly are pre-fitted with “Helicoils” (steel wire thread inserts). This prevents technicians from stripping the soft aluminum threads when tightening the heavy-duty steel bolts, dramatically increasing the component’s service life and durability.

The Critical “Shimming” System: Adjustment Gaskets

The most complex and “logical” جزء من FAW Rear Housing Assembly is its shimming system. The parts list details ten different ‘Adjustment gasket-sub box intermediate shaft’ عناصر (جزء رقم. 1701526-A9P through 1701537-A9P). These are not standard gaskets; they are **selective shims**.

When a transmission is built, ال “end-play” (the amount of fore-and-aft movement) of the counter-shaft is a critical, zero-tolerance specification. If the shaft is too “loose,” the helical gears will “whine” and fail to mesh properly. If it is too “tight,” the bearings will overheat, seize, and be destroyed.

المذكرة “(See 1701526-A9P)” indicates that these parts form a set. A technician assembles the FAW Rear Housing Assembly, measures the end-play with a dial indicator, and then consults a service manual. The manual will instruct them to select *one specific shim* (على سبيل المثال, 1701528-A9P) from this set. Each shim has a minutely different thickness.

Installing this one, correct shim sets the bearing “preload” to the perfect factory specification. This shimming procedure is the single most important step in rebuilding a FAW Rear Housing Assembly, as it ensures a quiet, موثوق, and long-lasting gearbox.

The Output System: محامل, Caps, and Speedometer

ال FAW Rear Housing Assembly provides the final output to the vehicle’s driveshaft. This is supported by the ‘Rear bearing-sub box output shaft’ (1701586-A9P). This is a massive roller bearing that supports the final output shaft, which is subjected to the full, multiplied torque of the selected gear ratio.

This bearing is held in place by the ‘Rear bearing cap-sub box output shaft’ (1701521-A9P), which is a heavy-duty cap that bolts to the rear of the FAW Rear Housing Assembly. This cap not only retains the bearing but also houses the main output shaft oil seal (not pictured), which prevents all the gear oil from leaking out.

This sub-assembly also contains the ‘Speedometer driven shaft assembly’ (1701440-11) and its corresponding ‘Driven gear-speedometer’ (1701446-A9P). This is the mechanical “إقلاع الطاقة” for the speedometer. A plastic gear on the output shaft spins this driven gear, which in turn spins a cable or electronic sensor (via the ‘Speedometer connector’ 1701447-A9P) to provide the vehicle speed to the dashboard. This is a critical data-reporting function of the FAW Rear Housing Assembly.

خدمة, يدعم, and Fasteners

ال FAW Rear Housing Assembly is designed for service. It includes an ‘Oil filler plug assembly’ (1701765-A2K) and its ‘Gasket’ (1701042-A2K) for filling the auxiliary box with its own separate oil supply. It also features a ‘Cover-sub box shifting oil hole’ (1701517-A9P) for accessing and servicing the range-shifter mechanism.

كامل FAW Rear Housing Assembly is supported and held rigid by the ‘Tension rod flexible cushion assembly’ (1302050-01) and its associated ‘Cushion’ (1302052-01). هؤلاء “stay rods” connect the heavy transmission to the chassis crossmembers, preventing the entire powertrain from twisting under torque and allowing the ‘Tension bolt’ (1702129-1ح) to maintain perfect alignment.

The assembly is held together with a massive number of high-tensile fasteners, including ‘Hex flange bolts’ (Q1841035S, Q1841085S, Q1841035S) and ‘Hex head bolts’ (CQ1500512S). The ‘Spring gaskets’ (س40308, Q40405) and ‘Hex nuts’ (CQ34008) are critical for ensuring none of these fasteners vibrate loose, which would be catastrophic for the FAW Rear Housing Assembly.

FAW Rear Housing Assembly Parts List

الجدول التالي يوفر كامل, تفصيل مفصل للجميع 22 components identified in the ‘Rear Housing Assembly’ (Sub-Box) رسم تخطيطي للجرار FAW CA4251P66K24T1A3E5. A rebuild of the FAW Rear Housing Assembly requires careful selection of the correct adjustment gaskets.

المواصفات الفنية وسياق التجميع

المواصفات ل FAW Rear Housing Assembly are defined by its function as the structural, precision-machined “sub-box” أو “range box”. كامل FAW Rear Housing Assembly is a zero-tolerance component.