GB/T 28693-2012 English PDF (GBT28693-2012)

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GB/T 28693-2012: Tractors and machinery for agricultural and forestry -- Requirements of the lighting and light-signalling devices
GB/T 28693-2012
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 65.060.10
T 68
Tractors and machinery for agricultural and forestry -
Requirements of the lighting and light-signaling
devices
ISSUED ON: SEPTEMBER 03, 2012
IMPLEMENTED ON: JANUARY 01, 2013
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Terms and definitions ... 5 
4 General requirements ... 6 
5 Main performance requirements ... 7 
6 Product inspection requirements ... 12 
7 Rules for inspection and judgement ... 13 
Tractors and machinery for agricultural and forestry -
Requirements of the lighting and light-signaling
devices
1 Scope
This Standard specifies general requirements, main performance requirements,
product inspection requirements, inspection and judgment rules for the lighting
and light-signaling devices of tractors and machinery for agricultural and
forestry.
This Standard is applicable to tractors and machinery for agricultural and
forestry (hereinafter referred to as the tractor).
2 Normative references
The following referenced documents are indispensable for the application of
this document. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any
amendments) applies.
GB 4785, Prescription for installation of the external lighting and light-
signaling devices for motor vehicles and their trailers
GB/T 10485, Road vehicles - Lighting and light-signaling devices -
Environmental endurance
GB 11564, Retro reflector for motor vehicles
GB 18447.1, Safety requirements for tractors - Part 1: Wheeled tractors
GB 18447.2, Safety requirements for tractors - Part 2: Walking tractors
GB 18447.3, Safety requirements for tractors - Part 3: Crawler tractors
GB 18447.4, Safety requirements for tractors - Part 4: Belt-drive wheeled
tractors
JB/T 6701, Tractor - Headlight
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1 tractors headlights
Lamps that provide high beam, or low beam, or far and low beam illumination
of the road ahead of the tractor
3.2 main-beam headlight
lamps for lighting the long-distance road ahead of the tractor
3.3 dipped-beam headlight
lamps that illuminate the road ahead of the tractor and do not cause dazzling
or discomfort to oncoming drivers and other road users
3.4 front position (side) lamp
lamps that indicate the presence and width of the tractor when viewed from the
front of the tractor
3.5 rear position (side) lamp
lamps that indicate the presence and width of the tractor when viewed from the
rear of the tractor
3.6 stop lamp
lamps to indicate to other road users behind the tractor that the tractor is braking
3.7 direction-indicator lamp
lamps used to indicate to other road users that the tractor will turn left or right
3.8 hazard-warning signal lamp
turn on all the turn signals on the tractor at the same time to draw the attention
of other road users that the tractor temporarily has some special hazard
3.9 reflex reflector
it consists of one or more retro-reflection optical units and has retro-reflection
function; a device that indicates the presence of the tractor to an observer
located near the light source through reflected light from an external light source
A non-triangular retroreflector is a retroreflector whose shape is not triangular.
inspection items and sequence in Table 4.
5.3.2 After the stop lamp is installed on the tractor, turn on the stop lamp and
rear position (side) lamp installed on the tractor separately. The luminous
intensity of the stop lamp should be more than 5 times that of the rear position
(side) lamp. The stop lamp and rear position (side) lamp are visually discernible
at night at a distance of 150m directly behind the tractor.
5.4 Position lamp
5.4.1 The light distribution performance requirements of the front and rear
position lamps shall comply with the provisions of the front position lamps and
rear position lamps for agricultural and forestry tractors and machinery. Anti-
environmental test and other requirements shall comply with the provisions of
GB/T 10485. Carry out the inspection according to the inspection items and
sequence in Table 4.
5.4.2 After the rear position lamp is installed on the tractor, turn on the rear
position lamp and stop lamp installed on the tractor separately. The luminous
intensity of the rear position lamp should be less than 1/5 of the luminous
intensity of the stop lamp. The rear position lamp and stop lamp can be visually
recognized at night at a distance of 150m directly behind the tractor.
5.5 Hazard-warning signal lamp
5.5.1 The light distribution performance requirements of hazard-warning signal
lamp shall comply with the regulations of direction-indicator lamp for agricultural
and forestry tractors and machinery. Anti-environmental test and other
requirements shall comply with the provisions of GB/T 10485. Carry out the
inspection according to the inspection items and order in Table 4.
5.5.2 After hazard-warning signal lamp is installed on the tractor, all direction-
indicator lamps are turned on by individually configured switches and flash
synchronously. The flash frequency should reach (1.5±0.5)Hz. After starting the
light signal switch, it should light up within 1.5s. Then flash at the specified
frequency.
5.5.3 If the tractor has a trailer, the hazard warning signal control switch on the
tractor should also control all direction-indicator lamps on the trailer. Even if the
engine control device is in a situation where it cannot be restarted, it should be
able to issue a hazard warning signal.
5.6 Reflex reflector
5.6.1 The shape, size, structure, chromaticity, photometric and anti-
environmental test requirements of the reflex reflector shall comply with the
requirements of GB 11564. Carry out according to the inspection items and