DieselMAX Engine Valve Cotter (fits JCB) - OEM 320/03528
OEM-quality engine valve cotter (tapered collet / valve keeper) for JCB DieselMAX and EcoMax engines (444, 448). This is a critical cylinder head component — a two-piece tapered locking collet seated in the groove of the valve stem that holds the valve spring under constant tension and ensures correct valve closure after every opening cycle. 2 pieces required per valve. OEM quality — exact dimensional fit and material hardness matching the factory DieselMAX engine specification.
⚠ Critical Safety Warning: Incorrect installation or failure of a valve cotter can cause the valve to drop into the cylinder while the engine is running — resulting in immediate and total destruction of the piston, cylinder head and bore. Always use the correct valve spring compressor tool and verify correct seating in the stem groove before starting the engine.
Technical Specification:
| Part Type |
Valve cotter (tapered collet, two-piece) |
|---|
| Parts Category |
Engine / Cylinder Head / Valves |
|---|
| Part Number |
320/03528 |
|---|
| Engine |
JCB DieselMAX / EcoMax (444, 448) |
|---|
| Qty per valve |
2 pcs. |
|---|
| Quality |
OEM (first fit quality) |
|---|
Application (JCB Machines with DieselMAX Engine):
Backhoe Loaders
3CX Entry Level (Global) · 3CX · 3DX · 4CX · 4DX · 5CX
Rough Terrain Forklifts
926 · 930 · 940 · 945 · 950
Construction Dumpers
6 Tonne · 7 Tonne · 9 Tonne
Skid Steer Loaders
225 · 250 · 260 · 270 · 270 S3.1/3.2 · 280 · 300 · 300 S3.1/3.2
330 · MC · Teleskid · Teleskid S3.1/3.2
Telescopic Handlers
506 · 507 · 508 · 509 · 510 · 512 · 514 · 520 · 525 · 526 · 527
530 · 531 · 532 · 533 · 535 · 536 · 538 · 540 · 541 · 542 · 550 · 555 · 558 · 560
Telescopic Wheel Loaders
TM 200 · TM 300 · TM 400
Tracked Excavators
JS Series (Tracked) · JZ Series · X Series · XR Series
Wheeled Excavators
Hydradig · JS Series (Wheeled)
Wheeled Loaders
411 · 412/412S · 413/413S · 416/416S · 417/417HT · 433 · 437 · 440 · 455
Workshop Technical Tip: Valve cotters are typically replaced during cylinder head overhaul — when renewing valves, valve guides or head gaskets. Always replace cotters as a full set (2 pcs per valve) together with the valve being fitted — reusing old cotters on a new valve stem increases the risk of loosening. Before fitting, inspect each cotter visually for cracks, worn groove surfaces or irregularities on the tapered face. Always use a dedicated valve spring compressor — fitting without the correct tool risks incorrect seating and catastrophic engine failure. After head assembly, verify cotter seating by lightly tapping each valve stem before installation.
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