A high-quality 331/36910 heater control knob by GX-AFTER. This is a control element for the heating and air conditioning (HVAC) system in the operator's cab. Fits a very wide range of JCB machines, including popular backhoe loaders (3CX, 4CX), telehandlers (Loadall), tracked and wheeled excavators (JS), mini excavators, and other construction equipment.
GX-AFTER is the smart choice for your machine. We provide high-class replacements that combine excellent build quality with an attractive price. Our cab parts are precisely fitted, ensuring operator comfort and ergonomics.
| Machine Type | Example Models / Series |
|---|---|
| Backhoe Loaders | 1CX, 2CX, 3C, 3CX, 4C, 4CN, 4CX, 5CX (many generations) |
| Telehandlers (Loadall) | 515-40, 520-40, 520-50, 524-50, 525-60, 527-58, 531-70, 533-105, 535-95, 535-125, 535-140, 540-140, 540-170, 541-70, 550-80 etc. |
| Excavators (JS) | JS115, JS130, JS145, JS160, JS180, JS190, JS200, JS210, JS220, JS240, JS260, JS300, JS330, JS360, JS370, JZ140 |
| Wheeled Excavators | JS145W, JS160W, JS175W, JS200W, Hydradig 110W |
| Mini / Midi Excavators | 801x, 802x, 803x, 804x, 805x, 806x, 808x series, and newer 16C-1 to 100C-1 |
| Other Machines | Wheel Loaders (406, 407, 409), Teletruk, Fastrac, Vibromax Rollers, Midi CX |
The model list is for reference. The knob is very universal and fits most JCB machines from the 90s and newer.
The knob is mounted on the shaft of a rotary switch (e.g., blower or A/C switch). If the knob itself is loose or cracked, replacing it usually solves the problem. If the issue lies deeper (no response to turning), the entire switch might need replacement.
The knob is the interface between the operator and the ventilation/heating system. It allows for smooth or stepped adjustment of operating parameters (e.g., fan speed).
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In many JCB models, the same knob is used for both blower speed (fan) and temperature (heating) control. Check the appearance of your knobs in the cab.
Do you have doubts or need confirmation to avoid costly downtime? Call us. Our experts will help you select the right part to get your equipment back to work as quickly as possible.
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Ventilator regulating knob suitable for JCB 3CX 4CX backhoe loaders and many models of mini excavators.

















