Roper Dryer Timer Knob Broken Off — What Part Fixes This?
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Understanding the Problem
A broken or stripped timer knob on a Roper dryer is a common mechanical failure — usually caused by excessive force when turning the dial, plastic fatigue over time, or a worn/stripped timer shaft. When the knob snaps off, you may no longer be able to set the cycle or the knob may spin freely without engaging the timer. In many cases only the plastic knob is damaged and a simple knob replacement will restore control. However, if the plastic knob slipped because the internal shaft that it attaches to is rounded, corroded, or the retaining spline inside the knob is damaged, replacing just the knob will not fix the problem long-term. In that case you need to inspect the timer shaft and the timer control itself; replacing the timer switch assembly may be necessary when the shaft or internal gears are damaged or the timer does not advance reliably.
Common Symptoms
Knob snapped or spinning freely; unable to select cycles; dryer won't start or timer won't advance; intermittent or no cycle selection.
Common Causes
- Plastic knob material fatigued or cracked from repeated use or accidental force
- Stripped or rounded timer shaft splines so the knob no longer engages
- Internal damage to the timer control (worn gears or broken cam) causing knob to spin without advancing
Popular Parts That Fix This Problem
These are the most common replacement parts that fix this problem. When you're ready to order, click below to find the right part at PartsDiscount.com — just search by your appliance model number for a guaranteed fit.
Helpful Repair Tip
Remove the broken knob stub and try to turn the timer shaft with pliers: if the shaft turns firmly and the dryer cycles normally, you only need a replacement knob; if it slips, is rounded, or the timer doesn't advance, replace the timer or timer shaft assembly.
Frequently Asked Questions
Can I just glue the broken knob back on?
Glue is a temporary fix at best. If the knob is only cosmetic broken but the splines and shaft are intact, you may get short-term use, but glue will usually fail under torque and high heat. It's better to replace the knob with a proper replacement that matches the shaft splines or replace the timer if the shaft is damaged.
How do I identify the correct replacement part for my Roper dryer?
Locate the dryer model and serial number (usually on a tag around the door opening or on the back panel). Use that model number when searching parts stores or contact authorized parts dealers. Many replacement knobs are inexpensive and sold as model-specific or universal spline sizes; timer assemblies must match the exact model.
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