8X-7921 Slack Adjuster Group is a heavy-duty Caterpillar brake-system component designed to regulate brake slack on off-highway trucks. With a compact design, STOR port configuration, and factory-specified dimensions, it supports reliable brake adjustment for CAT 777-series trucks operating in mining, quarrying, construction, and heavy earthmoving environments.
| Item | Specification |
|---|---|
| Product Name | Slack Adjuster Group / Brake Lines Slack Adjuster |
| Part Number | 8X-7921 |
| Brand | Caterpillar (CAT) |
| Machine Model | CAT 777C / 777D / 777G |
| Weight | 18.8 kg |
| Material | Steel and alloy components |
| Condition | Brand New – Genuine |
| Warranty | 6 Months |
| Packaging | Standard Export Carton |
| Availability | Generally in stock |
| Origin | China |
The 8X-7921 Adjuster Group is a brake-system component designed to regulate brake slack and support proper brake adjustment on Caterpillar off-highway trucks. It helps maintain controlled brake operation under demanding hauling conditions in mining, quarrying, and heavy earthmoving applications.
Cat specifications identify the component as a Slack Adjuster Group with STOR ports. Its overall dimensions are approximately 237.74 mm in length and 174.62 mm in width.
Key benefits include:
The 8X-7921 Slack Adjuster Group is listed for:
Cat also lists compatibility with 777F and 777E configurations. Exact fit can depend on the machine configuration and serial number, so verification is recommended before ordering.
YLCM supplies construction and mining machinery parts for Caterpillar and other major equipment brands, helping customers source critical components with compatibility support and reliable international delivery.
The 8X-7921 Adjuster Group is packed using export-standard packaging designed to protect the component during handling and transportation. Depending on order quantity and shipping requirements, packaging can include reinforced cartons, wooden cases or crates, moisture-proof protection, shockproof protection, and rust prevention.
YLCM provides flexible international logistics solutions according to destination, order size, and delivery requirements:
Q1: What is 8X-7921?
A: 8X-7921 is a Caterpillar Slack Adjuster Group used in heavy-duty braking systems.
Q2: What does the 8X-7921 adjuster do?
A: It provides a means of adjusting brake slack to help maintain proper brake system operation.
Q3: Which CAT machines use 8X-7921?
A: It is listed for CAT 777C, 777D, 777G, 777F and 777E applications.
Q4: What are the dimensions of 8X-7921?
A: Cat lists a length of 237.74 mm and a width of 174.62 mm.
Q5: What type of ports does it use?
A: The Cat specification identifies the port type as STOR.
Q6: Is 8X-7921 suitable for mining trucks?
A: Yes. It is used in Caterpillar off-highway truck braking systems, making it suitable for demanding mining and quarry hauling applications.
Q7: Is this part covered by warranty?
A: YLCM provides a 6-month warranty for this product under its standard warranty terms.
Q8: How can I confirm compatibility?
A: Send us your part number, machine model, serial number, required quantity, and destination. Our technical team can help verify the application before quotation.
Looking for 8X-7921 Slack Adjuster Group for CAT 777C, 777D, or 777G? Contact YLCM for the latest price, stock status, lead time, packaging and shipping options.
Please provide your part number, machine model, serial number, quantity, and destination so our team can confirm compatibility and prepare an accurate quotation.
