SPIERINGS AT4 User manual

USER MANUAL SPIERINGS TRUCK AT4
AT4-EN-041115.doc
I
Preface
Dear user,
This operating manual provides the user of the Spierings folding crane with information concerning the crane's
construction and operation. You will find detailed technical specifications and maintenance instructions in the
maintenance part of this manual.
© Copyright Spierings Cranes.
All rights reserved.
No part of this publication may be reproduced or published, in any formor in any way, by print, photo print, microfilm or any other means without prior permission from the
manufacturer.

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Liability clause
SECTION 1. OPERATION
1.1 The Spierings truck may only be used for the purpose it was manufactured and designed for and only as
described in the user manual or in the additions to it.
1.2 Any use of the Spierings truck that differs from its design purpose or as described in the use manual or
the additions to it, will cause the product warranty and the manufacturer’s liability, for any direct or
indirect damage, to expire.
1.3 Only qualified, skilled personnel are allowed to operate the truck. The driver should have a special
driving license for driving heavy vehicles. The driver/operator must be in good physical and mental
health, so that he/she is able to carry out the work without restrictions and react with responsibility in all
given situations.
1.4 The driver/operator/user of the Spierings truck should be informed immediately of any additions/changes
to the user manual.
SECTION 2. SAFETY
2.1 For safety reasons the driver/operator/user should carry out all operations as stated in the user manual
or in the additions to it.
2.2 If more stringent safety demands are locally placed on the truck/crane than specified in the Spierings
truck user manual or additions to it, these more stringent requirements must be strictly complied with. If
not, all warranty will expire and the manufacturer will not be liable for any damage or costs.
2.3 The Spierings truck manufacturer points out explicitly, that the driver/operator/user and local personnel
should not enter the cranes/trucks danger zone. If, for any reason or cause, an unexpected situation
occurs during operation one should contact the technical department or Spierings Service department
first before proceeding.
SECTION 3. WARRANTY
3.1 It is prohibited to carry out modifications or welding to the Spierings truck without prior written permission
of the manufacturer of the Spierings truck.
3.2 Frequent maintenance and periodic checks should be carried out in accordance with the user manual, or
in the additions to it. If maintenance or checks are carried out otherwise, or less frequent, without prior
written permission of the manufacturer of the Spierings truck, all warranty will expire and any liability, for
direct or indirect damage, is explicitly excluded.

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Explanation of the symbols used
CAUTION!
Wear safety goggles!
Wear safety gloves!
Wear safety boots!
Wear head protection!
Use safety belt!
Check!
Manual action!
Automatic action!
Wrong!
Right!
Information!

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Table of contents
PREFACE ................................................................................................................................................................ I
LIABILITY CLAUSE................................................................................................................................................ II
EXPLANATION OF THE SYMBOLS USED.......................................................................................................... III
TABLE OF CONTENTS.........................................................................................................................................IV
1. GENERAL DATA AT4.............................................................................................................................. 1-1
2. OPERATION............................................................................................................................................. 2-1
2.1. Get to know the truck .................................................................................................................. 2-1
2.2. Truck cab .................................................................................................................................... 2-5
2.3. Control panel............................................................................................................................... 2-7
2.4. Driving the Spierings crane....................................................................................................... 2-15
2.4.1. Starting........................................................................................................................ 2-15
2.4.2. Switching off the engine .............................................................................................. 2-15
2.4.3. Driving on the road...................................................................................................... 2-16
2.5. Driving off the road.................................................................................................................... 2-17
2.5.1. Off the road gear (transfer case)................................................................................. 2-17
2.5.2. Longitudinal differential lock........................................................................................ 2-17
2.5.3. Transverse differential lock.......................................................................................... 2-17
2.6. Braking system.......................................................................................................................... 2-18
2.6.1. Operating brake........................................................................................................... 2-18
2.6.2. Parking brake .............................................................................................................. 2-18
2.6.3. Vacuum brake ............................................................................................................. 2-18
2.7. Parking...................................................................................................................................... 2-18
2.8. Driving with a trailer................................................................................................................... 2-19
2.9. Towing the crane....................................................................................................................... 2-19
2.9.1. Towing free.................................................................................................................. 2-19
2.9.2. Towing the crane......................................................................................................... 2-19
2.10. Independent rear axle steering.................................................................................................. 2-20
2.11. Driving with erected tower......................................................................................................... 2-21
2.12. Axle height adjustment.............................................................................................................. 2-21
3. MAINTENANCE........................................................................................................................................ 3-1
3.1. Safety.......................................................................................................................................... 3-1
3.1.1. Clothing......................................................................................................................... 3-1
3.1.2. Surroundings................................................................................................................. 3-1
3.1.3. Diesel engine................................................................................................................. 3-1
3.1.4. Moving parts.................................................................................................................. 3-1
3.1.5. Oils and coolant............................................................................................................. 3-2
3.1.6. Environment .................................................................................................................. 3-2
3.1.7. Change oil cooling system............................................................................................. 3-2
3.1.8. Fire hazard .................................................................................................................... 3-2
3.1.9. Cleaning components.................................................................................................... 3-2
3.2. Maintenance plan truck AT4........................................................................................................ 3-1
4. THE DIESEL ENGINE .............................................................................................................................. 4-1
4.1. Access to the diesel engine......................................................................................................... 4-2
4.2. Engine oil .................................................................................................................................... 4-2
4.2.1. Check engine oil level.................................................................................................... 4-2

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4.2.2. Fill up engine oil............................................................................................................. 4-2
4.2.3. Engine oil change.......................................................................................................... 4-3
4.3. Engine oil filter............................................................................................................................. 4-4
4.3.1. Oil filter replacement...................................................................................................... 4-4
4.4. Cooling system............................................................................................................................ 4-5
4.4.1. Check coolant level ....................................................................................................... 4-5
4.4.2. Fill up coolant................................................................................................................ 4-6
4.4.3. Change coolant ............................................................................................................. 4-7
4.4.4. Anti-frost........................................................................................................................ 4-7
4.5. Radiator and intercooler.............................................................................................................. 4-8
4.6. Air inlet system............................................................................................................................ 4-9
4.6.1. Cleaning the air filter...................................................................................................... 4-9
4.6.2. Air filter cartridge change............................................................................................. 4-10
4.7. Fuel system............................................................................................................................... 4-11
4.7.1. Fuel filter change/clean ............................................................................................... 4-11
4.7.2. Bleeding the fuel system ............................................................................................. 4-12
4.8. Fuel filter/Water separator......................................................................................................... 4-13
4.8.1. Drain water separator.................................................................................................. 4-13
4.8.2. Clean/replace filter water separator............................................................................. 4-14
4.9. V-belts....................................................................................................................................... 4-15
4.9.1. Check the V-belts........................................................................................................ 4-15
4.9.2. Adjust the V-belts ........................................................................................................ 4-16
4.9.3. V-belt replacement ...................................................................................................... 4-16
4.9.4. Gear belt check ........................................................................................................... 4-17
4.9.5. Gear belt adjustment................................................................................................... 4-18
4.10. Exhaust system......................................................................................................................... 4-18
4.11......................................................................................................................................................... 4-18
4.12. Check and adjust the valve clearance....................................................................................... 4-19
5. DRIVE LINE.............................................................................................................................................. 5-1
5.1. Clutch and gear box.................................................................................................................... 5-2
5.1.1. Specifications gear box ................................................................................................. 5-2
5.1.2. Maintenance gear box................................................................................................... 5-2
5.1.3............................................................................................................................................ 5-2
5.1.4. Check oil level of the gear box....................................................................................... 5-3
5.1.5. Gear box oil change ...................................................................................................... 5-3
5.2. Transfer case.............................................................................................................................. 5-4
5.2.1. Specifications transfer case........................................................................................... 5-4
5.2.2. Maintenance transfer case............................................................................................ 5-4
5.2.3. Check oil level transfer case.......................................................................................... 5-4
5.2.4. Transfer case oil change............................................................................................... 5-5
5.3. Axles ........................................................................................................................................... 5-6
5.3.1. Maintenance axles......................................................................................................... 5-6
5.3.2. Check oil level differentials............................................................................................ 5-6
5.3.3. Differential oil change.................................................................................................... 5-7
5.3.4. Check oil level hubs....................................................................................................... 5-8
5.3.5. Hubs oil change............................................................................................................. 5-8
5.4. Tires............................................................................................................................................ 5-9
5.4.1. Maintenance tires.......................................................................................................... 5-9
5.4.2. Tire pressure ................................................................................................................. 5-9
5.5. Check the brake lining thickness................................................................................................. 5-9
5.5.1. Brakes........................................................................................................................... 5-9

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5.6. Clutch........................................................................................................................................ 5-10
5.6.1. Checking the clutch..................................................................................................... 5-10
5.6.2. Venting the clutch........................................................................................................ 5-10
5.6.3. Clutch fluid change...................................................................................................... 5-11
6. STEERING SYSTEM................................................................................................................................ 6-1
6.1. Check the steering system.......................................................................................................... 6-2
6.2. Align the steering system............................................................................................................ 6-2
7. ELECTRICAL SYSTEM............................................................................................................................ 7-1
7.1. Lighting........................................................................................................................................ 7-1
7.2. Dashboard lighting...................................................................................................................... 7-1
7.3. Batteries...................................................................................................................................... 7-2
7.3.1. Check the batteries........................................................................................................ 7-2
7.3.2. Recharging the batteries ............................................................................................... 7-2
7.3.3. Replacing batteries........................................................................................................ 7-2
8. HYDRAULIC SYSTEM ............................................................................................................................. 8-1
8.1. Check oil level hydraulic tank...................................................................................................... 8-1
8.2. Hydraulic oil change.................................................................................................................... 8-2
8.3. Check the suspension’s accumulators........................................................................................ 8-3
9. PNEUMATIC SYSTEM ............................................................................................................................. 9-1
9.1. Primary system: brake system.................................................................................................... 9-1
9.2. Secondary system: accessories and gearbox............................................................................. 9-1
9.3. Air dryer....................................................................................................................................... 9-2
9.3.1. Air dryer filter change .................................................................................................... 9-2
9.4. Air vessels................................................................................................................................... 9-2
9.5. Air lubricator/water separator...................................................................................................... 9-3
9.5.1. Refill air lubricator.......................................................................................................... 9-3
9.5.2. Water separator............................................................................................................. 9-3
9.6. Check brake pressure................................................................................................................. 9-4
9.7. Hoses and connections pneumatic system................................................................................. 9-4
10. LUBRICATION........................................................................................................................................ 10-1
10.1. Central lubrication system (Option)........................................................................................... 10-1
10.1.1. Timer central lubrication system................................................................................ 10-1
10.1.2. Grease reservoir central lubrication system .............................................................. 10-1
10.1.3. Greasing points central lubrication system................................................................ 10-2
10.2. Manual lubrication..................................................................................................................... 10-3
10.2.1. Outrigger beam cylinders .......................................................................................... 10-3
10.2.2. Driven axles............................................................................................................... 10-3
10.2.3. Cardan shafts............................................................................................................ 10-4
10.2.4. Steering system......................................................................................................... 10-4
11. VARIOUS................................................................................................................................................ 11-1
11.1. Window washer fluid................................................................................................................. 11-1
11.2. Fire extinguisher........................................................................................................................ 11-1
12. TECHNICAL DATA................................................................................................................................. 12-2
13. ENCLOSURES ....................................................................................................................................... 13-1

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1. General data AT4
The AT4 carriage is especially designed for the Spierings SK477 folding crane. Extra attention is paid to a smooth
and comfortable transport to the work site. The crane is suited for driving on public roads, fully equipped with
counterweight and tools. The chassis is an especially rigid structure to create a good crane support.
In Picture 1-1 you will find the measurements of the SK477 with the AT4 carriage. The dimensions given are the
overall dimensions, axle bases and turning circle.
Picture 1-1
Drive unit:
•11.63 litres DAF diesel engine with turbo compressor and intercooler (type WS 268L).
•ZF gearbox with 16 gears forward and two gears reverse.
•STEYR high/low gear shift, transfer case, with high speed (road) and low speed (off the road) transmission.
•Four Ginaf axles, where axles two, three and four are driven.

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Steering:
•Axles one, two and four are steered.
•Mechanically coupled steering, where axle four is steered in the opposite direction of axle one and two,
realizing a small turning circle.
•Hydraulically powered 1-circuit steering system.
•Hydraulically powered 2-circuit steering system (serialno. 47752 and higher)
•Fitted with an emergency steering pump, so when the main steering pump malfunctions, the truck remains
steerable until it is at a standstill.
•Provisions for driving off the road:
•Axle height adjustable
- high/low gear shift transfer case can be put in low gear for driving off the road
- longitudinal and transverse differentials can be locked.
Suspension:
•Hydro-pneumatic suspension
•The suspension can be blocked (e.g. when driving with erected tower).
Braking system:
•Pneumatic brakes.
4-point outrigger system:
•Wide support base : 6.55 m x 6.15 m
•Narrow support base : 6.55 m x 5.1 m
Power supply:
The superstructure can be supplied with power in two different ways:
•External power-supply 40 kVA during erecting and folding, 40 kVA during operation.
•The truck built-in Leroy Somer 70 kVA generator for power supply to the superstructure when (sufficient)
external power is lacking.
Further data:
•Maximum speed limited to 85 km/h.
•Minimum speed at 1000 rpm: 1.8 km/h (is 30 m/min) .
•Truck weight including superstructure and counterweight 48,000 kg.
•The axle load is 12,000 kg per axle.

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Identification:
-Engine number: On top of the engine block.
-Carriage frame number: On the identification plate in the co-driver's leg-room (See Picture
1-2) and stamped in the right frame girder in front of the first axle
(See Picture 1-3).
Picture 1-2
Picture 1-3

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2. Operation
2.1. Get to know the truck
Picture 2-1
1. Truck cab
Besides driving the crane, with the controls in the truck cab you can adjust the carriage axle height and switch the
generator (PTO) on and off.
2. Spare tire/Extra sling box/Pallet hook support
On this location you can install one of the following options:
•Spare tire support. The spare tire support is fitted with a winch and is mounted on a swing frame. When you
swing the frame out you can lower the spare tire with the winch.
•Extra sling box
•Pallet hook support
3. Storage box/Battery box/Battery switch
On the right hand side between axle 2 and 3 a storage box (2) is located. In this box you will find the batteries (1)
of the truck. On the outside of the box the battery switch (3) is located.

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Picture 2-2
4. Storage box/Power box
In the storage box on the left side you will find the power-
box (2).
With the selector switch on the power-box, the power
supply for the crane is selected. Either an external power
supply can be connected to this power box, or the built-in
generator supplies the power. Power can also be branched
off for accessory equipment.
Picture 2-3
5. Outrigger control box
Two control boxes for the outriggers are located just behind the truck cabin. One on the left hand side and one on
the right hand side.
6. Outriggers
At both sides of the truck there are 2 extending outrigger beams, and to each beam a hydraulically operated
outrigger (See Picture 2-4). These outriggers provide stability during hoisting operation.
A: Outrigger pad holder
B: Outrigger beam
C: Antiskid
D: Outrigger cylinder
E: Outrigger pad
Picture 2-4

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7. Storage room support plates (optional)
To obtain a solid support base on a week ground, support plates can be used. Under the storage box on the left
hand side (See Picture 2-3, 1) as well as under the fuel tank there are 2 support plates each.
8. Toolbox at the rear (optional)
For extra storage room a toolbox can be mounted all along the rear of the truck.
9. Bumper
The crane has a standard bumper at the rear. When the bumper is folded up, the towing hook can be used (refer
“Driving with a trailer”).
10. Jib turning pipe
At the rear bumper the jib turning pipe is stored. This pipe is used to swing the jib in front of the tower during
erecting and back when folding the crane.
11. Sling box
A sling box (1) can be mounted on the right-hand
engine cowling (2).
Picture 2-5
12. Fuel tank
The fuel tank capacity is 400 litres.
13. Oil tank
The oil tank (2) capacity is 70 litres and is equipped with
a gauge-glass (1).(See Picture 2-6)
Picture 2-6

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14. Underneath the engine cowling
Under the engine cowling at the left hand side
the filter for the truck’s hydraulics (4) can be
found. On the right hand side the air dryer (2)
and grease pump (1) for automatic lubrication
(optional) are located. In the middle you will
find the air cleaner (3). (See Picture 2-7).
Picture 2-7
15. Exhaust valve handle
By operating the exhaust valve handle (1)
the engine exhaust gasses can be leaded
either through the upper exhaust pipe or
the lower exhaust pipe.
Picture 2-8

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2.2. Truck cab
In the truck cab you drive the crane safely and comfortably to its destination. This chapter makes you familiar with
the cab.
Getting in
Use the step under the door. Make use of the steering wheel to hold on to.
Doors
Turn the handle up to open the door from the inside. The door can only be locked up from the outside. There is an
ashtray on the inside of the door. After opening the ashtray, you push the locking device down to remove the
ashtray from the holder to empty it.
Wing mirrors
The wing mirrors may be adjusted by hand. Make sure the mirrors are adjusted before driving off, so that you
have satisfactory view. The mirror heating (optional) can be switched on with the switch on the control panel.
Seats
The cab has room for the driver and a co-driver. Both seats
are damped by spring load. The seats can be adjusted. This
should only be done when the vehicle stands still.
1. Adjusting knob lumbar support
2. Adjusting knob back position
3. Height adjusting knob
4. Adjusting knob seat position
5. Adjusting lever seat forward/backward
6. Adjusting knob seat height
Picture 2-9
Fuse box
The fuse box is mounted right-handed at the co-driver's side. You will find the fuses listed in the enclosures.

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Windscreen washer reservoir (2)
The windscreen washer reservoir is mounted on the left-handed side below the dashboard on the co-driver’s side.
(See Picture 2-10)
Picture 2-10
Battery charger remote control batteries
You will find the battery charger (1) for the remote control of the crane on the middle console of the cabin (See
Picture 2-10).
The remote control of the crane comes with 2 batteries.
While the batteries are charging, an indicator lamp will light up. As soon as they are fully charged, the lamp starts
flashing.
Fire extinguisher
One fire extinguisher is behind the co-driver's seat.
On the right behind the control box in the crane cab is the second fire extinguisher.
The fire extinguishers must be inspected every year by the authorities.

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2.3. Control panel
Picture 2-11
1. Airflow heater
2. Heater (this knob can also be located on the
left hand side of the tunnel)
3. Radio
4. Voltmeter batteries
5. Oil-pressure gauge (diesel engine)
6. Fuel gauge
7. Coolant temperature gauge
8. Revolution counter, hours counter
9. Indicator lamp full head beam
10. Indicator lamp charging batteries
11. Indicator lamps blinker
12. Indicator lamp air pressure
13. Indicator lamp air cleaner
14. Indicator lamp flame starting system
15. Indicator lamp oil pressure (diesel engine)
16. Battery charge gauge
17. Speed switch fan heater
18. Air-pressure gauge circuit 1
19. Air-pressure gauge circuit 2
20. Indicator lamp parking brake
21. Mirror heater
22. Working lights
23. Indicator lamp steering circuit 1
24. Indicator lamp steering circuit 2
25. Switch rotating beacon
26. Switch fog tail light
27. Light switch; off, parking light, dipped beam
28. Switch windscreen wiper
29. Switch windscreen washer
30. Switch cab interior light on the left
31. Switch cab interior light on the right
32. Switch alarm light
33. Blank
34. Switch transverse differential lock axle 2, 3
and 4
35. Indicator lamps differential lock axle 2, 3 and
4
36. Indicator lamp max. pressure hydraulic
system outriggers / suspension
37. Switch longitudinal differential lock transfer
case and axle 3
38. Indicator lamps longitudinal differential lock
transfer case and axle 3
39. Switch / indicator lamp levelling
40. Switch/transfer case road, terrain, PTO
41. Frequency meter generator
42. Voltmeter generator
43. Switch clock central lubrication system
(optional)
44. Reservoir clutch fluid
45. Vacuum brake / engine stop
46. Lever for blinker and full beam
47. Tachograph, speedometer, mileage, counter,
clock
48. Ignition lock
49. Clutch pedal
50. Steering wheel
51. Brake pedal
52. Accelerator pedal
53. Manual pedal hold
54. Lever parking brake
55. Switch all axles up / down
56. Switch axle 1 and 2 up / down
57. Switch axle 3 up /down
58. Switch axle 3 and 4 left up /down
59. Switch axle 3 and 4 right up /down
60. Switch / indicator lamp axles blocked
61. Indicator lamp transfer case high (road)
62. Indicator lamp transfer case low (terrain)
63. Switch/indicator lamp PTO engaged
64. Blank
65. Gear-lever with splitter

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2. Knob heater warm/cold
Turning this knob, the air of the heater can be set warmer or colder. This knob can also be
located on the left hand side of the tunnel.
4. Voltmeter Batteries
On this meter you can read the battery condition. The meter must be in the middle (approx. 24 Volt)
5. Oil-pressure gauge diesel engine
When starting this gauge will read approx. 5 bar. As soon as the oil of the diesel engine is warmed
up it will read approx. 3 bar.
6. Fuel gauge
This gauge only functions when the ignition is switched on.
7. Coolant temperature gauge
On this gauge you can read the coolant temperature. In the diesel engine safety system an
overheating sensor is built-in. As soon as the temperature exceeds 110 °C, it activates the horn.
Also the Indic
ator light “oil pressure” (15) will light up. The engine must be switched off immediately.
10. Warning lamp charging voltage batteries
If the charging voltage of the batteries is too low, this indicator lamp will light up.
12. Warning lamp air-pressure
If the air-pressure in brake circuit 1 or 2 is below 5.5 bar, this indicator lamp will light up. The crane
can and must not be driven. If this lamp is on after starting the engine, leave the engine running at
idling speed until the air-pressure is 5.5 bar. The lamp will go out.
14. Indicator lamp pre-heating diesel engine
This lamp lights up when pre-heating the diesel engine. The light remains on while holding the
ignition key in position 1. Check pre-heating times in chapter “driving with the crane”
15. Oil-pressure indicator lamp
Immediately stop the engine when this lamp lights up. The oil pressure of the diesel engine is too
low or the coolant temperature is too high.

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18. Air-pressure gauge circuit 1
It indicates the air-pressure in brake circuit 1. When the pressure is below 5.5 bar, indicator lamp 12
will light up. The crane must not be driven.
19. Air-pressure gauge circuit 2
This gauge indicates the air-pressure in brake circuit 2. When the pressure is below 5.5 bar, indicator
lamp 12 will light up. The crane must not be driven.
20. Indicator lamp parking brake
As long as the parking brake is engaged, this lamp is on (when starting the engine the parking
brake remains engaged as long as the air-pressure is below 5.5 bar).
21. Mirror heating (optional)
With this switch the mirror heating in the left en right wing mirror is switched on and off.
22. Work Lamps (optional)
At the rear of the cab or at the rear truck bumper work lamps can be installed. With this switch the
work lamps are switched on and off.
23. Indicator lamp steering pressure circuit 1
This lamp is only fitted in case the truck has a two circuit steering system (serialno. 47752 and
higher).
This Lamp lights up as soon as the oil pressure in steering circuit 1 is too low. Have the malfunction
repaired as soon as possible. If this lamp lights together with lamp 24: STOP IMMIDIATELY!
24. Indicator lamp steering pressure circuit 2
This lamp is only fitted in case the truck has a two circuit steering system (serialno. 47752 and
higher).
This lamp lights up as soon as the oil pressure in steering circuit 2 is too low. Have the malfunction
repaired as soon as possible. If this lamp lights together with lamp 23: STOP IMMIDIATELY! When
the vehicle stands still, this lamp will light.

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25. Rotating beacon
With this switch the Rotating beacon can be switched on and off.
26. Fog tail-light
With this switch the fog tail-light on the cab can be switched on and off.
27. Light switch
By pressing this switch halfway, the parking lights are switched on. By pressing the switch all the
way, the dipped beams are switched on.
28. Windscreen wiper
By pressing this switch halfway, the windshield wipers wipe at normal speed. By pressing the
switch all the way the windshield wipers wipe at high speed. There is no intermittent position.
29. Windscreen washer
By pressing this switch the windshield wiper washer is activated.
30/31. Cab lighting
The driver can operate the cab lighting by operating the switches on the dashboard. The lighting will
also go on when opening the door. We advise you not to switch on the cab lighting when driving in
the dark, to prevent annoying reflections in the windscreen.
34/35. Switch/indicator lamp transverse differential lock.
Engage the transverse differential locks on axle 2, 3 and 4.
Show if the transverse differential locks on axle 2, 3 and 4 are engaged.
36. Indicator lamp max. pressure outrigger-/suspension system
This lamp lights up and a beeper sounds at the rear outriggers as soon as the pressure in the
outrigger/suspension system becomes too high. This may happen when the outriggers, the axles or
the outrigger beams are fully in or out, or because there is an obstacle in the way when extending
the outrigger beams.
During levelling operation, when moving the axles up or down or operating the outriggers this light
could also light up. This does not present a problem.