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Read articles →An owner-operator who has run his SA-424 for five years and 230 hours walks through fixing a throttle lever that wouldn't hold RPM. He shows exactly which dash panels to remove, names every bolt size (10mm, 14mm, 24mm), locates the friction disc under the steering column, and explains which nut to tighten. Best for SA-424 owners facing the same creeping-throttle symptom who want a confirmed DIY fix with the actual tools listed.
An owner-operator sharing a real-world repair from his own machine, with no apparent dealership or brand affiliation evident from the transcript.
The friction disc under the dash, which the throttle lever is mounted to, has loosened over time and needs to be tightened to restore holding tension.
Remove the steering wheel (24mm nut), take off the top dash panel (three 10mm bolts), then remove the lower dash halves (two more 10mm bolts) to expose the disc.
A 14mm wrench, a 10mm wrench and socket with extension, a Phillips head screwdriver, and a 24mm socket for the steering wheel nut.
The owner's tractor had about 230 hours and this was the first throttle adjustment needed after five years of use.
![Yanmar Tractor SA424 Throttle Friction Disc Adjustment [EASY DIY]](https://i.ytimg.com/vi/rFohIX62HAQ/mqdefault.jpg)