In March 2021, UD Trucks filed a statutory recall with Japan's Ministry of Land, Infrastructure, Transport and Tourism (MLIT) concerning the Shock Absorber, covering the Quon. The filing affects 127 vehicles manufactured between July 18, 2017 and March 2018.
Overview
| MLIT filing number | 1149241 |
|---|---|
| Type | Statutory Recall (government-mandated recall) |
| Date filed | March 31, 2021 |
| Manufacturer(s) | UD Trucks |
| Component | Shock Absorber |
| Production period | July 18, 2017 — March 2018 |
| Vehicles affected | 127 units |
Filing in context
The Shock Absorber is the most frequently cited component category in this archive, appearing in 11 of its 4,890 filings. This filing is one of 35 UD Trucks notifications from 2021 in this archive. For scale, 3,776 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 8 months.
Defect
On large trucks, (1) the shock absorber piston design on vehicles equipped with an air suspension height-adjustment system is incorrect. Lateral forces cause excessive contact pressure between the piston and cylinder wall. Repeatedly raising the vehicle to maximum height and lowering it during loading and unloading operations allows the piston ring groove to score the cylinder's inner wall. Continued use in this condition causes metal fragments to accumulate and seize in the piston ring area, leading to bending or fracture of the shock absorber. In the worst case, the damaged shock absorber may contact the tire, causing a burst or generating enough heat to ignite a vehicle fire.
Corrective action
(1) On all vehicles, replace the shock absorber with the corrected part. In addition, distribute a supplementary addendum to the owner's manual describing the characteristics of the height-adjustment system.
Affected models & chassis ranges
This filing lists 10 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 |
|---|---|---|
| 2PG-CD5BA | QUON | JNCMBN0C1JU027814 — JNCMB02C8JU031052 |
| 2PG-CD5CA | QUON | JNCMB02C9HU022497 — JNCMB02CXJU031683 |
| 2PG-CD5CE | QUON | JNCMB02C9JU031576 |
| 2PG-CG5CA | QUON | JNCMB02G2JU026738 — JNCMB02G6JU031733 |
| 2PG-CG5CL | QUON | JNCMB02G6JU026676 — JNCMB02G9JU028969 |
| 2PG-CW5AL | QUON | JNCMB02DXHU025076 — JNCMB02D0JU029983 |
| 2PG-CW5CA | QUON | JNCMB02D6JU030216 — JNCMBP0D7JU030690 |
| 2PG-CW5CL | QUON | JNCMBP0DXHU025266 — JNCMBP0D4JU028928 |
| 2PG-GK5AAB | QUON | JNCMB22A7JU027262 — JNCMBP0A7JU030551 |
| 2PG-GK5AAD | QUON | JNCMB22A4JU027834 — JNCMB22A5JU030547 |
Original Japanese (MLIT source text)
Show the original Japanese filing text
状況
大型トラックにおいて、 （１） エアサスペンション仕様の車高調整装置装備車におけるショックアブソーバのピストン構造が不適切なため、横力によってピストンとシリンダの接触面圧が過大となり、荷役作業時等で最大車高まで上昇させ下降する動作を繰り返すと、ピストンリング溝部で内壁を傷つけることがある。そのため、そのままの状態で使用を続けると、当該ショックアブソーバのピストンリング部に金属片が溜まり固着して、曲りや折損が発生し、最悪の場合、タイヤと干渉してバーストまたは発熱により発火するおそれがある。
改善措置
（１） 全車両、ショックアブソーバを対策品と交換する。また、取扱説明書に車高調整装置の特性に関する記述の追補版を配布する。
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=3004934
Related recalls
Same manufacturer, same component
Other UD Trucks filings involving the Shock Absorber, closest to this one by filing date.
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 →Pressure Control / Transmission Component — affects 127 vehicles.
Open recall detail →Steering Linkage — affects 127 vehicles.
Open recall detail →Other (Frame/Body) — affects 11 vehicles.
Open recall detail →Other (Engine) — affects 18,386 vehicles.
Open recall detail →All UD Trucks recalls · All 2021 recalls · Recall Archive home