In October 2018, UD Trucks filed a statutory recall with Japan's Ministry of Land, Infrastructure, Transport and Tourism (MLIT) concerning the Cooling System, covering the Quon. The filing affects 31 vehicles manufactured between May 2018 and June 2018.
Overview
| MLIT filing number | 1143650 |
|---|---|
| Type | Statutory Recall (government-mandated recall) |
| Date filed | October 30, 2018 |
| Manufacturer(s) | UD Trucks |
| Component | Cooling System |
| Production period | May 2018 — June 2018 |
| Vehicles affected | 31 units |
Filing in context
The Cooling System is the most frequently cited component category in this archive, appearing in 34 of its 4,890 filings. This filing is one of 35 UD Trucks notifications from 2018 in this archive. For scale, 4,301 of the 4,890 filings in this archive report a larger number of affected vehicles; the vehicles involved here were manufactured over a span of about 1 month.
Defect
On large all-wheel-drive vehicles, the stud bolts securing the fan hub to the radiator cooling fan are improperly torqued during assembly. This causes cracks to form at the stud bolt insertion points in the hub, allowing the bolts to loosen. The cooling fan then develops rotational runout, imposing excessive load on the water pump housing at the hub mounting point. If the water pump housing fractures, the cooling fan assembly can detach and fall toward the radiator. In the worst case, the radiator core is damaged and coolant leaks, rendering the vehicle inoperable, or fragments of the water pump housing fall onto the road.
Corrective action
On all vehicles, replace the fan hub and stud bolts with new parts and torque the bolts to the specified value.
Affected models & chassis ranges
This filing lists 2 type code(s). A vehicle is affected if its chassis number falls within one of the ranges below.
| Type code (型式) | Model | Chassis ranges |
|---|---|---|
| 2DG-CF5AL | QUON | JNCMBN0B7JU032894 — JNCMBN0B8JU034413 |
| 2DG-CZ5BL | QUON | JNCMBP0E4JU032938 — JNCMBP0E7JU034635 |
Original Japanese (MLIT source text)
Show the original Japanese filing text
状況
大型総輪駆動車の冷却装置において、ラジエータ冷却ファンと締結するファンハブに取付けたスタッドボルトの締付け方法が不適切なため、当該ハブのスタッドボルト挿入部に亀裂が発生し緩むものがある。そのため、冷却ファンが回転振れし当該ハブ固定部のウォーターポンプハウジングに負荷が掛かりウォーターポンプハウジングが破断すると、冷却ファンと一体でラジエータ側へ脱落して、最悪の場合、ラジエータコアが損傷し冷却水漏れにより走行不能、または、ウォーターポンプハウジングの一部破片が路上に落下するおそれがある。
改善措置
全車両、ファンハブとスタッドボルトを新品と交換し、当該ボルトを規定トルクで締付ける。
Source & verification
This entry reproduces public data from Japan's MLIT recall registry. English text is jdmvin.com's own translation; always verify against the official source:
https://renrakuda.mlit.go.jp/renrakuda/ris-detail-car.html?class=recalldatacar&id=3004381
Related recalls
Same manufacturer, same component
Other UD Trucks filings involving the Cooling System, closest to this one by filing date.
Cooling System — affects 708 vehicles.
Open recall detail →Cooling System — affects 1,075 vehicles.
Open recall detail →Cooling System — affects 10,248 vehicles.
Open recall detail →Other recalls affecting the same models
Filings whose affected type codes overlap with this one, newest first.
Other (Control Device) — affects 26,885 vehicles.
Open recall detail →Propeller Shaft — affects 17,587 vehicles.
Open recall detail →Computer — affects 899 vehicles.
Open recall detail →Other (Engine) — affects 18,386 vehicles.
Open recall detail →Propeller Shaft — affects 7,074 vehicles.
Open recall detail →All UD Trucks recalls · All 2018 recalls · Recall Archive home