Product Name: Transmission Pull-Type Input Shaft Cover (First Shaft Cover / Clutch Release Bearing Cover)
OEM Number: AZ2222020001
Brand: SINOTRUK / CNHTC
Application: SINOTRUK HOWO T7H and T5G series heavy duty trucks with pull-type clutch and manual transmission

--- WHAT IT IS ---

The AZ2222020001 is a transmission input shaft cover specifically designed for pull-type clutch systems on SINOTRUK HOWO T7H and T5G heavy duty trucks. It mounts to the front face of the gearbox housing and serves as the sealing and support cover for the input shaft (first shaft) and clutch release bearing mechanism.

In a pull-type clutch configuration, the release bearing pulls the clutch diaphragm spring instead of pushing it. This cover provides the precise mounting interface and sealing surface for the release bearing assembly, while also protecting the transmission interior from dust, moisture, and contamination.

--- THE PROBLEM IT SOLVES ---

The input shaft cover is subject to constant vibration, heat cycling, and mechanical load from the clutch release mechanism. Over time, the original cover can develop cracks, warpage, or corrosion. A damaged or warped cover leads to several problems: transmission oil leaks at the front seal, improper alignment of the clutch release bearing, difficulty shifting gears, clutch drag or incomplete release, and premature failure of the input shaft bearing.

This replacement cover restores the correct alignment and sealing of the pull-type clutch system, ensuring smooth clutch operation and preventing transmission oil loss.

--- WHY CHOOSE THIS UNIT ---

Genuine SINOTRUK OEM specification ensures exact fitment on T7H and T5G transmissions without modification.

The cover is manufactured from high strength cast iron or ductile iron, providing the rigidity needed to support the pull-type clutch release bearing mechanism.

Precision machined mating surfaces guarantee a perfect seal against the transmission housing, eliminating oil leaks.

The component includes all necessary bolt holes, alignment dowel positions, and the central bore for the input shaft and release bearing.

This part is specifically engineered for pull-type clutch systems, which are common on modern HOWO heavy duty trucks. Using a non-OEM or incorrect cover can cause clutch release failure.

--- TECHNICAL DETAILS ---

OEM Number: AZ2222020001
Component Type: Transmission input shaft cover (pull-type clutch cover)
Application: Front cover of gearbox, mating with clutch housing
Clutch Type: Pull-type (release bearing pulls diaphragm spring)
Material: High strength cast iron or ductile iron
Mounting: Bolt-on to transmission front face
Sealing: Uses gasket or sealant (as per OEM spec)
Bore Diameter: Matches input shaft and release bearing dimensions
Surface Finish: Machined faces, black anti-corrosion paint

--- PRODUCT PARAMETERS ---

Condition: New
Warranty: 12 months
Applicable Industries: Heavy duty truck fleet maintenance, auto repair shops, commercial vehicle parts wholesale
Weight: Approximately 1.5 to 2.5 kg
Video outgoing-inspection: Available upon request
Machinery Test Report: Available upon request
Marketing Type: Regular product (OEM grade)
Standard or Nonstandard: Standard (OEM specification)
Structure: One-piece cast cover
Body Material: Cast iron / ductile iron
Place of Origin: Shandong, China
Brand Name: SINOTRUK (OEM grade)
Product Name: Transmission Pull-Type Input Shaft Cover
OE Number: AZ2222020001
Color: Black or natural cast
Quality: High-Quality (OEM grade)
Package: Neutral carton with foam protection
Delivery time: 7 to 15 working days after order confirmation
Payment terms: T/T, Western Union, PayPal
MOQ: 1 piece
Sample: Available (customer pays shipping)

--- MATERIAL COMPOSITION ---

Base Material: High strength cast iron (HT250 or equivalent) for vibration damping and wear resistance
Surface Coating: Black anti-rust paint or e-coat
Machined Surfaces: Mating face to transmission housing, bore for input shaft, bolt hole bosses
Hardware: Cast-in threaded holes or through holes as per original design

--- COMPATIBLE VEHICLE APPLICATIONS ---

Confirmed fitment (verify by VIN or original part number):

SINOTRUK HOWO T7H series (all heavy duty tractor, dump truck, and concrete mixer variants with pull-type clutch)
SINOTRUK HOWO T5G series (medium-heavy duty trucks with pull-type clutch)
Other SINOTRUK HOWO models equipped with the same pull-type transmission

Note: This component is specific to pull-type clutch systems. Do not use on push-type clutch applications. Always confirm by checking the original part number AZ2222020001 and comparing the old cover before ordering. The cover is typically the same for left and right drive configurations.

--- INSTALLATION NOTES ---

Transmission removal is required to access the input shaft cover. The gearbox must be separated from the engine.

Drain the transmission oil before removal. Remove the clutch release mechanism as needed.

Unbolt the old input shaft cover. Clean the mating surface on the transmission housing thoroughly.

Apply a new gasket or sealant as per SINOTRUK workshop manual specifications.

Install the new cover, ensuring alignment dowels are properly seated. Torque mounting bolts to factory specification (typically 25 to 35 Nm depending on bolt size).

Reassemble the clutch release bearing and related components. Refill transmission with correct oil.

Reinstall the transmission and test clutch operation before returning vehicle to service.

Professional installation recommended due to the complexity of transmission and clutch systems. Full procedure available digitally upon request.

--- WHEN TO REPLACE ---

Replace the input shaft cover if you observe transmission oil leaking from the front of the gearbox, visible cracks on the cover, signs of impact damage, corrosion that compromises sealing, or during a complete clutch or transmission rebuild.

It is also recommended to replace the cover if the original has been previously welded or repaired, as structural integrity may be compromised.

--- PACKAGING AND DELIVERY ---

Packaging: Neutral carton with foam padding or bubble wrap to prevent damage during transit
MOQ: 1 piece
Delivery Time: Regular orders within 24 to 48 hours. Bulk orders require 5 to 10 working days
Place of Origin: Shandong, China
Payment Terms: T/T, Western Union, PayPal
Shipping Terms: EXW, FOB Qingdao, CFR, CIF, DDU

--- CONTACT ---

Sales Manager: William
Phone / WeChat: +86 19050562894
Email: Sales22@chinatruck.cc
Company: Authorized commercial vehicle parts supplier

--- WARRANTY AND OFFERS ---

12 month warranty against manufacturing defects.
Free basic installation guidance (digital document) upon request.
Bulk order discounts available for 10 pieces or more.
Express shipping available for urgent replacement needs.
Free VIN based compatibility check before ordering.