Swing faults split into motor faults (weak swing, no swing, drift through internal leakage) and gearbox faults (noise, backlash, pinion wear). The motor and its gearbox are separate assemblies — the pinion that meshes with the swing bearing belongs to the gearbox side, and swing pinion shafts are documented on the gear parts page. The listings below are the motor assemblies on record.
Documented listingsDocumented Swing Motor Listings
| Part number | Part | Compatible with | Machine models |
|---|---|---|---|
| 14550094 | Swing motor | Volvo | EC240BC |
| 14572717 / VOE14572717 | Swing motor | Volvo | ECR88 |
| 14663485 / VOE14663485 | Swing motor | Volvo | EC750D |
| 14724048 / 14744890 | Swing motor | Volvo | EC350D |
| 165-9337 | Swing motor | Caterpillar | CAT345B |
| 169-5569 / 333-3073 / 170-9893 | Swing motor assembly | Caterpillar | E311C, 312C, 312CL, 312D |
| 170301-00041B | Swing motor | Doosan | DX225, DX225-7 |
| 170301-00111B | Swing motor | Doosan | DX225-7 |
Before You Order
- Part number and machine model — swing motors differ across serial ranges of the same model.
- The symptom: no swing, weak swing, drift, or noise. Drift with a healthy brake points inside the motor; noise points at the gearbox and pinion.
- Whether the gearbox is needed — motor-only and motor-with-gearbox listings are different numbers.
Swing motors are named components in the hydraulic repair solution, so a rebuild assessment is available before a replacement is quoted.
Delivery and preparation times are confirmed for your order in the enquiry reply, in writing and before payment: the reply states the times, the packing and the shipping method that apply to your exact part number. Times are confirmed per order rather than published as a general figure, because they follow the listing, the quantity and the destination.
Frequently Asked Questions
The upperstructure drifts when parked on a slope. Is that the motor?
Drift is usually the swing brake or internal leakage in the motor. Either way the motor assembly is the unit to quote — send the number and describe the drift, and the reply will separate motor from gearbox pricing.
Do you sell the swing gearbox separately?
Gear components including swing pinion shafts are documented on the gear parts page; gearbox assemblies are confirmed by part number in the enquiry reply.
Do the parts carry a warranty?
Warranty terms are confirmed in writing for each order before payment. Kyotechs' own FAQ states that most parts are backed by a warranty against manufacturing defects; ask for the term that applies to your listing when you enquire.
Swing Diagnosis Notes
Three swing complaints cover most cases, and each points somewhere different. Drift on a slope with the brake released is normal; drift with the brake applied means the brake or the motor's internal sealing is passing oil. A clunk at the start and stop of swing is backlash — pinion, ring gear or gearbox wear — before it is a motor fault. Swing that is strong one way and weak the other suggests relief or valve issues upstream of the motor. Working through which of these you have, before the enquiry, is what lets the reply quote a motor, a gearbox component or a valve check instead of guessing. The gear parts and swing bearing pages cover the mechanical half of the same system.
A note on case-drain measurements: motor wear announces itself in the case drain line before it announces itself in swing performance. If a flow measurement is possible during diagnosis, rising case-drain flow against the maker's limit confirms internal wear regardless of how the swing feels. Include the figure in the enquiry if you have it; a motor quoted against measured wear is a confident purchase, and a motor whose case drain is healthy points the diagnosis back to the brake or the valve.