Adjuster auto-tension suitable for the JCB engine
GX-AFTER

Adjuster auto-tension suitable for the JCB engine

Catalog number:SKX976191A Nr OEM:320/08759 Manufacturer:GX-AFTER
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Belt tensioner suitable for JCB DieselMax / EcoMax engine - 320/08657

Technical Specification & Compatibility

High-quality GX-AFTER belt auto-tensioner for JCB 444 DieselMax and EcoMax engines. It maintains correct belt tension for alternator, water pump and A/C drive, ensuring quiet operation and long accessory life.

Primary P/N: 320/08657
Cross-refs: 320/08584, 320/08759, 320/08651, 320/A8586, 320/08652, 320/A8538
Type: Belt auto-tensioner with pulley
Engine / Use: JCB 444 DieselMax, JCB EcoMax (incl. JCB generators using these engines)
Housing / Pulley material: aluminium housing; steel/composite pulley (depending on batch)
Key dimensions (approx.): pulley Ø ~70 mm, belt width ~31 mm; assembly ~150 × 83 × 88 mm (W×H×D)

Applications

Brand Models / Types
JCB 2CX, 3CX, 4CX; Loadall: 520-50, 527-55, 535-95, 540 (among others); Telemaster
JCB Generators with DieselMax/EcoMax engines
Wheel loaders / excavators Units fitted with JCB 444 DieselMax / EcoMax (incl. selected JS variants; confirm by VIN)

Unsure about fitment? Share your machine serial/engine type and we’ll confirm.

Fitting essentials

  • New multi-rib belt (matched to A/C configuration).
  • Check idler/guide pulley and pulley alignment.
  • Clean pulley grooves; inspect alternator bearings.

What does it do & symptoms of wear

The auto-tensioner compensates belt stretch/load changes. Worn units cause belt squeal, vibrations, irregular belt wear and risk of overheating due to slip at the water pump.

Why choose our product?

GX-AFTER combines proven quality with OEM-level fit. Precision build and robust materials deliver long service life and hassle-free installation.

  • Accurate build: stable belt tension, reduced vibration.
  • OEM compatibility: interchangeable with 320/08657, 320/08584, 320/08759, 320/08651 etc.
  • Tech support: we help select the right belt and companion pulleys.

Installation Tips

  1. Track belt run: engine ON — confirm the belt does not wander on pulley edges.
  2. Pulley alignment: even slight misalignment shortens belt/tensioner life.
  3. Tightening torques: follow JCB manual to avoid loosening or thread damage.
  4. Replace glazed/cracked belts: new tensioner with old belt often keeps the noise.
  5. Spin test: with engine OFF, rotate the pulley — rough noise = replace.

FAQ

Is 320/08657 interchangeable with 320/08584, 320/08759, 320/08651?

Yes — common cross-refs for JCB 444 DieselMax/EcoMax engines. Always confirm by VIN/engine label.

When should I replace the tensioner?

Belt squeal, vibration, heat marks, pulley play and unstable tensioner pointer indicate replacement.

Does it fit A/C variants?

Yes; the tensioner is common, but belt length/routing differs with A/C. Select the correct belt.

Approximate pulley dimensions?

Pulley Ø ~70 mm, belt width ~31 mm (typical for 320/08651-/08657-/08759 family).

Key Benefits

🛡️

Stable Tension

Less slip, quieter accessory drive

🎯

Exact Fit

DieselMax / EcoMax compatible

📦

Hassle-free Install

GX-AFTER quality, OEM-level fit

Question mark

Need help with compatibility? Contact us — we’ll match the part and advise on fitting.

SKX976191A
320/08759
1.14 kg

Data sheet

SUITABLE FOR
JCB
MACHINE TYPE
ARTICULATED / DUMP TRUCK
BACKHOE LOADER
EXCAVATOR
GENERATOR
ROBOT
TELESCOPIC HANDLER
WHEELED LOADER
OEM NUMBERS
320/08657 / 320/08584 / 320/08759 / 320/08651 / 320/A8586 / 320/08652 / 320/A8538
ENGINE
JCB DIESELMAX
JCB ECOMAX

Specific References

MPN
320/08759
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Adjuster auto-tension suitable for the JCB engine

Catalog number: SKX976191A
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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

85.49 zł

net price
69,50 zł
Available in large quantity Temporarily unavailable
69,50 zł
net price

85.49 zł

gross price
Nie możesz dodać więcej produktów
  • You will receive 7 points, it gives you 2.80 zł
  • Lowest price from 30 days before the discount: 85.49 zł
    PRODUCT SPECIFICATION
    SUITABLE FOR
    JCB
    MACHINE TYPE
    ARTICULATED / DUMP TRUCK
    BACKHOE LOADER
    EXCAVATOR
    GENERATOR
    ROBOT
    TELESCOPIC HANDLER
    WHEELED LOADER
    Show more
    OEM NUMBERS
    320/08657 / 320/08584 / 320/08759 / 320/08651 / 320/A8586 / 320/08652 / 320/A8538
    ENGINE
    JCB DIESELMAX
    JCB ECOMAX

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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)

    Email



    Gadu-Gadu communicator
    GG: 4185846 - Daniel
    Phone
    +48 17 864 31 00
    +48 17 864 00 24
    +48 17 864 25 96

    Mobile phone
    +48 607-700-547
    +48 695-944-818
    +48 691-330-531
    +48 690-906-751

    Fax
    +48 17 864 31 20