8330-3121 Coleman-Mach AC Selector Shaft Extender
8330-3121 Coleman-Mach AC Selector Shaft Extender
Restore smooth, wobbly-free knob operation in your Coleman-Mach RV air conditioner control assemblies with this genuine OEM selector shaft extender. Designed to slip over the original steel temperature-selector shaft, it provides the precise length and fit needed for accurate thermostat adjustments.
📋 Compatibility & Fit
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OEM replacement for part numbers 8330-312 and 8330-3121
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Works with Coleman-Mach Mach 3 (38203-066/069), Mach 3 Plus, Mach 8 and 9-Series control boxes
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Compatible with thermostats such as 8330-3362 (analog zone control) and 8330A3341 (5-button Zone Control)
⚙️ Technical Specifications
| Specification | Details |
|---|---|
| Material | Black-anodized aluminum |
| Inner Diameter | 1/4 inch (fits 0.250″ selector shaft) |
| Outer Diameter | 3/8 inch (0.375″) |
| Length | 1.75 inches |
| Included Hardware | (2) Stainless set screws, nylon washer |
🔧 Customer Benefits
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Ensures firm engagement between the shaft and thermostat knob for precise temperature control
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Genuine OEM fit prevents slippage and reduces service callbacks
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Simple slip-over installation—no modifications, drilling, or adhesives required