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Mr. Perry Wu International Sales Director
FAST 8JS85C Gearbox Parts - Auxiliary Case Main Shaft/Countershaft/Housing/Cylinder Assembly
|
Model |
8JS85C/85E |
|
Brand |
Fast |
|
Number of Gears |
8 forward gears + 2 reverse gears |
|
Shifting Mode |
Manual Transmission |
|
Maximum Input Torque |
850 N.m |
|
Adapted Vehicles |
Suitable for harsh working conditions and high-intensity heavy-duty operations, widely applied in buses, coaches, trucks, tractors, trailers and special vehicles |
Product Description
These parts are engineered exclusively for the FAST 8JS85C 8-speed manual gearbox, tailored to heavy-duty scenarios like long-haul transportation, logistics and special vehicle operations.
Crafted from premium materials—high-strength steel for shafts and gears, wear-resistant rubber for seals, and durable engineering plastics for structural components—all parts undergo professional precision processing. Key processes include forging, heat treatment, CNC machining and airtightness testing, meeting the gearbox’s 850 N.m maximum input torque requirement. Strict dimensional accuracy and performance inspections ensure full compatibility with original equipment.
Auxiliary Case Main Shaft Assembly Parts
Main shaft, synchronizer assembly, reduction gear and flange nut—core components for stable power transmission of the auxiliary case.
Left and Right Countershafts of Auxiliary Case
Welded countershafts, cylindrical roller bearings and circlips—supporting balanced torque distribution in heavy-load operations.
Auxiliary Case Housing Assembly Parts
Housing, gaskets, odometer sensor and flange plate—forming the auxiliary case’s structural protection and sealing system.
Auxiliary Case Cylinder Assembly Parts
Cylinder, piston, shift fork and O-rings—ensuring reliable range shift switching of the auxiliary case.
Direct-fit design allows hassle-free installation without modification, fully interchangeable with original parts. Ideal for routine maintenance, emergency repairs and fleet bulk procurement.
Detail Parts List
1、 Auxiliary Case Main Shaft Assembly
|
No. |
Parts No. |
Part Name |
Qty. |
|
1 |
Q43135 |
Elastic Retaining Ring for Shaft |
1 |
|
2 |
RN307M/YA |
Cylindrical Roller Bearing |
1 |
|
3 |
JS85T-1707140 |
Auxiliary Case Synchronizer Assembly |
1 |
|
4 |
JS85T-1707161 |
Stop Ring |
2 |
|
5 |
JS85T-1707105 |
Auxiliary Case Main Shaft |
1 |
|
6 |
JS85E-1707121 |
Auxiliary Case Main Shaft Reduction Gear |
1 |
|
7 |
JS85T-1707107 |
Auxiliary Case Main Shaft Washer |
1 |
|
8 |
JS85T-1707108 |
Auxiliary Case Main Shaft Gear Pressure Plate |
1 |
|
9 |
J80-1701157 |
Flat Washer |
1 |
|
10 |
J90-1701170 |
Flange Nut |
1 |
2、Left and Right Countershafts of Auxiliary Case
|
No. |
Parts No. |
Part Name |
Qty. |
|
1 |
NJ306EN/C3 |
Cylindrical Roller Bearing |
2 |
|
2 |
Q43372 |
Flattened Wire Circlip for Shaft |
2 |
|
3 |
JS85E-1707047 |
Auxiliary Case Countershaft Welded Assembly |
2 |
|
4 |
NF307EM |
Cylindrical Roller Bearing |
2 |
3、Auxiliary Case Housing Assembly
|
No. |
Parts No. |
Part Name |
Qty. |
|
1 |
JS85T-1707016 |
Auxiliary Case Housing Gasket |
1 |
|
2 |
Q1231630 |
Stud Bolt |
2 |
|
3 |
Q40316 |
Spring Washer |
2 |
|
4 |
Q341B16 |
Hexagon Nut |
2 |
|
5 |
JS85T-1707015 |
Auxiliary Case Housing |
1 |
|
6 |
6JS160T-1709588-1 |
O-Ring |
1 |
|
7 |
6JS160T-1709587-1 |
Pipe Plug |
1 |
|
8 |
Q1421032 |
Hexagon Head Bolt and Spring Washer Assembly |
14 |
|
9 |
Q1421070 |
Hexagon Head Bolt and Spring Washer Assembly |
4 |
|
10 |
6212N |
Deep Groove Ball Bearing |
1 |
|
11 |
C01020 |
Stop Ring |
1 |
|
12 |
F500-1802064 |
Spacer Sleeve |
1 |
|
13 |
J70-1701157-1 |
Odometer Rotor |
1 |
|
14 |
JS85T-1707156 |
Auxiliary Case Rear Bearing Cover Gasket |
1 |
|
|
C03054-30 |
Electronic Odometer Sensor Assembly |
1 |
|
17 |
X11412 |
Odometer Protection Sleeve |
1 |
|
18 |
JS85T-1707155 |
Auxiliary Case Rear Bearing Cover |
1 |
|
19 |
Q2140512 |
Socket Head Cap Screw with Ball End |
1 |
|
20 |
Q40305 |
Spring Washer |
1 |
|
21 |
Q1421080M |
Pre-Coated Hexagon Head Bolt and Spring Washer Assembly |
4 |
|
23 |
6J55T-1701161 |
Rear Cover Oil Seal |
1 |
|
24 |
J80-1701160 |
Dust Cover |
1 |
|
25 |
J80I-1701159-6 |
Flange Plate |
1 |
4、Auxiliary Case Cylinder Assembly
|
No. |
Parts No. |
Part Name |
Qty. |
|
1 |
JS85T-1707067 |
Auxiliary Case Shift Fork |
1 |
|
2 |
Q1421040M |
Pre-Coated Hexagon Head Bolt and Spring Washer Assembly |
2 |
|
3 |
JS85T-1707066 |
Auxiliary Case Shift Fork Shaft |
1 |
|
4 |
GB3452.1-C0212G |
O-Ring |
1 |
|
5 |
JS85T-1707053 |
Auxiliary Case Cylinder Assembly Gasket |
1 |
|
6 |
JS85T-1707061 |
Auxiliary Case Cylinder |
1 |
|
7 |
JS125T-1707073 |
Sealing Gasket |
1 |
|
8 |
JS125T-1707072 |
Pipe Fitting |
1 |
|
9 |
12845 |
90 Elbow Pipe Fitting |
2 |
|
10 |
GB3452.1-16X2.65 |
O-Ring |
1 |
|
11 |
JS85T-1707063 |
Auxiliary Case Cylinder Piston |
1 |
|
12 |
GB3452.1-D0487G |
O-Ring |
1 |
|
13 |
Q40112 |
Flat Washer |
1 |
|
14 |
Q32812 |
Type 1 Hexagon Lock Nut with Non-Metallic Insert |
1 |
|
15 |
JS85T-1707064 |
Auxiliary Case Cylinder Gasket |
1 |
|
16 |
JS85T-1707062 |
Auxiliary Case Cylinder Head |
1 |
|
17 |
Q1421038M |
Pre-Coated Hexagon Head Bolt and Spring Washer Assembly |
1 |
|
18 |
Q1421038 |
Pre-Coated Hexagon Head Bolt and Spring Washer Assembly |
3 |
Product Advantages
8JS85C Exact Fit
100% matched to original dimensions, no fitment issues for heavy-duty repairs.
Heavy-Duty Durability
Withstands 850 N.m torque and harsh working conditions, extending service life.
Stable Power Transmission
Precision-machined main shaft and countershafts guarantee consistent torque delivery.
Superior Sealing Performance
High-quality gaskets and O-rings prevent oil leakage and dust intrusion.
Easy Maintenance
Modular design enables quick replacement without full gearbox disassembly.
Payment & Shipping Terms
● MOQ: 1 piece
● Packaging: Customizable wooden crate/carton
● Delivery: 3-20 working days (express: DHL/FedEx; sea freight for bulk)
● Payment: L/C, T/T, Western Union; tracking number provided in 24hrs
● After-Sales Service：24-hour technical support, global service network