|Years in operation||2015 – Present|
|Engine||Volvo D9B310 EC60B|
|Transmission||ZF Ecolife 6 AP 1400 B|
|Accessibility||Low Floor & Wheelchair-accessible|
|Emission Standard||Euro V (SCR)|
The Volvo B9L (Bus chassis, 9-litre engine, Low-floor) is a low-entry single-deck city bus built by Volvo Buses between 2005 and 2013, replacing the Volvo B7L and Volvo B10L. An articulated model, the Volvo B9LA, was also available. Like other Volvo buses, the chassis was manufactured in Sweeden.
Local private bus operator ComfortDelGro Bus acquired 32 units of diesel-powered Volvo B9L buses(bodied by SC Auto) for use on NUS Internal Shuttle Bus (ISB) routes. These routes serve the Kent Ridge Campus of the National University of Singapore (NUS).
The Volvo B9L was produced between 2005 and 2013, available as a chassis alone or an integral product, able to be fitted as a Volvo 7500, Volvo 7700 or Volvo 7900. The option for diesel or compressed natural gas (CNG) powered versions were also provided. CNG variants would have the gas tanks mounted on the roof of the bus.
The full low-floor design was made possible by mounting the engine vertically and to the left of the rear, achieving a continuous low-floor passage that could accommodate a third door at the rear if needed. This provided added convenience to the passengers, and the increase in transport efficiency due to the low-floor design. Production stopped in 2013 when Volvo Buses decided to develop on the hybrid Volvo B5LH chassis instead, which succeeded the Volvo B9L.
The Volvo B9L and B9LA feature an inline six-cylinder Volvo D9B diesel engine, available in 260hp, 310hp and 360hp power outputs, and comply with Euro V emissions standards through the use of Selective Catalytic Reduction (SCR). For natural gas buses, the Volvo G9A offers 260hp or 300hp power outputs. Both types of engines can be paired with ZF EcoLife or Voith DIWA gearbox options.
In 2015, private bus operator ComfortDelgro Bus brought in its first fully low-floor bus, the Volvo B9L. Painted in the orange and blue colors of the National University of Singapore (NUS), it was intended for deployment on NUS Internal Shuttle Bus (ISB) routes, which the company operates.
- Volvo D9B310-EC06B diesel engine
– Turbocharged & intercooled, 9365cc
– 310 hp (228 kW) @ 1900 rpm
– Torque rating of 1400 Nm @ 1100 – 1500 rpm
- Euro V compliant
Selective Catalytic Reduction (SCR) technology requiring diesel exhaust fluids such as AdBlue.
- ZF Ecolife 6 AP 1400 B gearbox
Six-speed automatic with integrated retarder
- SC Auto Bodywork
Bodied by SC Auto in Singapore, modelled after the SC Chivalrous bodywork.
- Shenzhen Kabym Technology Co. Ltd BYM-17616P8*10Y-BUS
EDS & GPS Stop Reporter
Orange LED matrix design. Front, side and rear (3 units)
Kabym AL-K80 EDS controller
ComfortDelGro Bus’ Volvo B9L buses were bodied by local coach bodybuilder SC Auto modelled after the SC Chivalrous styling, which was previously built for high floor and low entry coaches. The Volvo B9L bodywork design chares the same head design as the coach counterpart.
Volvo B9L buses made their debut on NUS ISB routes in early August 2015, in time to complement the start of a new school term. Configured as an urban bus, the Volvo B9L joined the Scania K230UB buses to enhance the higher-demand routes of NUS, such as Service A1/A2 and D1/D2, where transit buses are more suited to the loading patterns of such services (frequent boarding and alighting of commuters). These buses were gradually deployed to Service B, C and BTC1, replacing ComfortDelgro’s ageing Isuzu LT133P high-floor coaches and the Sunlong 6.7m midibuses on these routes.
Inside, the buses feature a stop-reporting system configured for automatic operation by relying on GPS by Shenzhen Kabym Technology Co. Ltd, a system previously trialled on the Scania K230UB. A display unit at the front of the bus relays bus stop information to commuters coupled with announcements.
Buses were later modified (~2019) with a partitioning barrier between the driver’s cab and the aisle to prevent passengers from standing too close to the bus driver and obstructing their field of vision. A scuffing protector was also installed underneath the front overhang to mitigate underfloor damage sustained by the front overhang.
While the Volvo D9B packs lots of power well-suited for heavy commuter loads and the steep slopes of Kent Ridge, the six-speed ZF EcoLife transmission it cycles through makes the bus feel draggy. The lack of sound insulation makes the engine feel very loud, both from within and outside the vehicle. As the chassis was designed for a left-hand drive market, the vertically-mounted cooling package is located on the left of the bus, which results in loud engine noise facing passengers waiting at a bus stop. As with other low-floor buses, standing space is limited along the narrow aisle between the rear door and the last row of seats. Nevertheless, the bus is a welcome replacement for the high-floor Isuzu LT133P bus, promoting passenger flow and easy access.
List of Buses
PA2A PA33K PC3738E PC3763G PC3769R PC3785T PC3787M PC3849T PC3853E PC3867R PC3876P PC3880B PC3906L PC3925G PC3929X PC3931M PC3940L PC3947T PC3954Y PC3957P PC3967K PC3972U PC3983M PC3989Y PC3995D PC4009U PC4019R PC4032B PC4038K PC4051X PC4068Z PC4071M
dnata Singapore acquired two Volvo B9L units for use as apron buses at Singapore Changi Airport. Bodied by Gemilang Coachworks of Malaysia, these buses were equipped with a rear door located behind the rear axle, maximizing the full-low floor feature of the chassis.
Photo credits to ADAMS Coachlines. More photos of the bus can be found in their photo album here.