Plate brake friction suitable for CAT machines
FEROSTEM

Plate brake friction suitable for CAT machines

Catalog number:SKX663705FM1 Nr OEM:1337234 Manufacturer:FEROSTEM
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FEROSTEM BRAKE FRICTION DISC (SBRZ) FOR CAT 428C, 428D, 432D - 1337234

Technical Specification and Compatibility

A key component of the wet brake pack – this is a precision-made brake friction disc by FEROSTEM. It is designed for the drive axles in CATERPILLAR backhoe loaders (e.g., 424D, 428D, 428C, 416B, 428B, 432D, 436C, 438D, 442D) and compactors (CP/CS). Unlike steel plates, this disc features a high-performance Sintered Bronze (SBRZ) friction material and 22 internal teeth (splines) to engage the axle shaft. The special "waffle" groove pattern (SPR/WAG) ensures optimal oil circulation, cooling, and smooth braking.

Part number: 1337234 / 133-7234
Alternative part numbers: 47123297, 87305713, 2304017, 2399956
Manufacturer: FEROSTEM
Material: Sintered Bronze (SBRZ)
Groove Type: SPR/WAG (Waffle Pattern)
Outer Diameter: 204.5 mm
Inner Diameter (Spline): 53.3 mm
Thickness: 4.8 mm
No. of Teeth (Splines): 22

FEROSTEM is a specialized manufacturer of brake system components, delivering high-quality discs and plates that are precisely engineered to meet the rigorous demands of construction machinery, ensuring safety and durability.

Essential for Brake Service

  • › Steel Separator Plates (e.g., 9R9401 or 9R2476): Friction discs work in alternation with steel plates. The entire pack should always be replaced together.
  • › Axle Oil (with LSD additive): Required to refill the axle after the brake service.
  • › Axle Seals: Brake replacement requires removing the planetary hub, which necessitates replacing the axle seals.

Application in machines

Brand Type / Series / Model
CATERPILLAR Backhoe Loaders: 424D, 428D, 428C, 416B, 428B, 432D, 436C, 438D, 442D

The list above is for reference. We recommend verifying the part number or exact dimensions (OD 204.5mm / 22 Teeth / Thickness 4.8mm) before purchasing.

⚠️ Safety Warning

Servicing wet brakes in a drive axle is an advanced repair. It requires the machine to be securely supported on stands and involves removing heavy components (wheels, planetary hub). A faulty brake system is a fatal hazard. Ensure the system is properly bled after repair.

Part's Role in the Machine and Failure Diagnostics

The friction disc is the executive component in a wet brake pack. It has internal splines (22 teeth) that engage the axle shaft. During braking, a piston compresses the pack, and the friction between these SBRZ discs and the steel separator plates stops the machine. Wear or damage to these discs is the primary cause of brake failure.

  • › Weak or fading braking power (pedal feels spongy or goes to the floor).
  • › Loud grinding, scraping, or squealing from the axle during braking.
  • › Overheating of the axle and a distinct burning smell.
  • › Presence of dark sludge (friction material) in the axle oil.

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🔧 Expert's Guide: Key Installation Tips

  1. Replace as a Kit: Never replace just one friction disc. Always replace the entire kit (all friction discs 133-7234 and all steel plates, e.g., 9R9401 or 9R2476, depending on model) on both sides of the axle to ensure even braking and correct pack clearance.
  2. Absolute Cleanliness: The brake system is a hydraulic system. Assembly must be done in sterile conditions. The smallest contaminant can damage the brake pump or piston.
  3. Oil Submersion: Before assembly, all new friction discs must be generously soaked in the correct axle oil (with LSD additive). Do not install them dry.
  4. Bleeding: After reassembly and refilling with oil, the brake system must be thoroughly bled according to the service procedure.

Frequently Asked Questions (FAQ)

1. What is the difference between this disc (9R2477) and a separator plate?

This disc (9R2477/133-7234) is the friction component (made of Sintered Bronze - SBRZ) and has internal teeth (22 splines) that engage the axle shaft. A Separator Plate (e.g., 9R9401 or 9R2476) is the smooth steel disc that goes between the friction discs.

2. What does SBRZ and SPR/WAG mean?

SBRZ stands for Sintered Bronze, which is the high-performance friction material used in wet brakes. SPR/WAG (Spring/Waffle) refers to the specific "waffle" groove pattern on the disc's surface, which helps oil circulation and cooling.

3. My machine is a CAT 428B. Which steel plate do I use with this disc?

The 428B model typically uses this friction disc (9R2477) in combination with the thinner 9R2476 (2.7 mm) steel plate. Newer models like the 428C/D often use the thicker 9R9401 (4.5 mm) plate. You must verify your machine's specific axle setup.

Znak zapytania

Have doubts or need confirmation to avoid costly downtime? Call us. Our experts will help you choose the right part to get your equipment back to work as soon as possible.

SKX663705FM1
1337234
0.70 kg

Data sheet

SUITABLE FOR
CAT
MACHINE TYPE
BACKHOE LOADER
OEM NUMBERS
1337234
OUTER DIAMETER (MM)
204,5
INNER DIAMETER (MM)
53,3
THICKNESS (MM)
4,8
NUMBER OF TEETH
22

Specific References

MPN
1337234
Łączna ocena:
0,0
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Plate brake friction suitable for CAT machines

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Manufacturer

  • Serwis Kop Sp. z o.o. Sp. K.
  • Podkarpacka 57A
  • 35-082 Rzeszów
  • Poland
  • [email protected]
  • +48178643100

Responsible person

  • Serwis Kop Sp. z o.o. Sp. K.
  • Podkarpacka 57A
  • 35-082 Rzeszów
  • Poland
  • [email protected]
  • +48178643100
gross price

38.75 zł

net price
31,50 zł
Available in large quantity Temporarily unavailable
31,50 zł
net price

38.75 zł

gross price
Nie możesz dodać więcej produktów
  • You will receive 3 points, it gives you 1.20 zł
  • Lowest price from 30 days before the discount: 38.75 zł
    PRODUCT SPECIFICATION
    SUITABLE FOR
    CAT
    MACHINE TYPE
    BACKHOE LOADER
    OEM NUMBERS
    1337234
    OUTER DIAMETER (MM)
    204,5
    INNER DIAMETER (MM)
    53,3
    THICKNESS (MM)
    4,8
    NUMBER OF TEETH
    22

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    WE OFFER PRODUCTS OF THE BEST BRANDS

    SERWIS KOP Sp. z o.o. Sp.k.
    ul. Podkarpacka 57A, 35-082 Rzeszów
    NIP: 813-352-97-49 REGON: 180286726

    Opening hours
    Telephone support - Monday - Friday (8:00 AM – 5:00 PM)
    Order pick-up - Monday - Friday (8:00 AM – 4:30 PM)

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