2015 YAMAHA GRIZZLY 550 coolant temperature

4-2
4
EBU26696Indicator lights and warning lights
EBU17991Low-range indicator light “ ”
This indicator light comes on when the transmis-
sion is in the low-range position.EBU17981High-range indicator light “ ”
This indicator light comes on when the transmis-
sion is in the high-range position.EBU17861Neutral indicator light “ ”
This indicator light comes on when the transmis-
sion is in the neutral position.EBU17831Reverse indicator light “ ”
This indicator light comes on when the transmis-
sion is in the reverse position.EBU17971Park indicator light “ ”
This indicator light comes on when the transmis-
sion is in the park position.
1. On-Command differential gear lock indicator light “DIFF. LOCK”
2. Low-range indicator light “L”
3. High-range indicator light “H”
4. Neutral indicator light “N”
5. Reverse indicator light “R”
6. Park indicator light “P”
7. On-Command four-wheel-drive/differential gear lock indicator “ ”/“ ”
8. Engine trouble warning light “ ”
9. Coolant temperature warning light “ ”
10.Electric Power Steering warning light “EPS” (for EPS model)U2LB61E0.book Page 2 Friday, February 21, 2014 3:03 PM

4-3
4
EBU30531Coolant temperature warning light “ ”
This warning light comes on when the engine
overheats. When this occurs during operation,
stop the engine as soon as it is safe to do so and
allow it to cool down for about 10 minutes.
The electrical circuit of the warning light can be
checked by turning the key to “ ” (on). The
warning light should come on for a few seconds,
and then go off.
If the warning light does not come on initially when
the key is turned to “ ” (on), or if the warning
light remains on, have a Yamaha dealer check the
electrical circuit.NOTICEECB00892The engine may overheat if the ATV is over-
loaded. In this case, reduce the load to spec-
ification.
 The engine may also overheat if mud or dirt
has accumulated on the radiator (i.e., after
riding in wet terrain). In this case, see page
8-19 for an explanation on how to access the
radiator. 
Start the engine after making sure that the
warning light is out. Continuous use while
the warning light is on may cause damage to
the engine.
EBU30481Engine trouble warning light “ ”
This warning light comes on or flashes when an
electrical circuit monitoring the engine is not work-
ing correctly. When this occurs, have a Yamaha
dealer check the self-diagnosis system. (See page
4-7 for an explanation of the self-diagnosis de-
vice.)
The electrical circuit of the warning light can be
checked by turning the key to “ ” (on). The
warning light should come on for a few seconds,
and then go off.
If the warning light does not come on initially when
the key is turned to “ ” (on), or if the warning
light remains on, have a Yamaha dealer check the
electrical circuit.
U2LB61E0.book Page 3 Friday, February 21, 2014 3:03 PM

6-1
6
EBU19882
OPERATION
EBU19902Read the Owner’s Manual carefully before riding
the ATV. If there is a control or function you do not
understand, ask your Yamaha dealer.
WARNING
EWB00632Read the Owner’s Manual carefully to become
familiar with all controls in order to help pre-
vent any loss of control, which could cause an
accident or injury. EBU30561Starting the engineNOTICEECB00151See the “Engine break-in” section on page 6-4
prior to operating the engine for the first time. 1. Turn the key to “ ” (on) and the engine stopswitch to “ ”.
The following warning lights should come on
for a few seconds, then go off.
Coolant temperature warning light 
Engine trouble warning light
The EPS warning light should come on, then
go off when the engine is started. (for EPS
model)
NOTICEECB00825If a warning light does not go off, see page 4-2
for the corresponding warning light circuit
check. To avoid possible damage, do not oper-
ate the ATV if a warning light stays on. 2. Apply the brake pedal, and then shift the drive select lever into the neutral or park position.
The corresponding indicator light should
come on. If the indicator light does not come
on, have a Yamaha dealer check the electrical
circuit.TIPThis model is equipped with an ignition circuit cut-
off system. The engine can be started under the
following conditions:
The drive select lever is in the neutral or park po-
sition.
U2LB61E0.book Page 1 Friday, February 21, 2014 3:03 PM

8-32
83. If the coolant is at or below the minimum level
mark, remove panel D to access the coolant
reservoir. (See page 8-10.)
4. Remove the coolant reservoir cap, add cool- ant or distilled water to the maximum level
mark, install the reservoir cap, and then install
the panel. NOTICE: If coolant is not avail-
able, use distilled water or soft tap water
instead. Do not use hard water or salt wa-
ter since they are harmful to the engine. If
water has been used instead of coolant,
replace it with coolant as soon as possible,
otherwise the cooling system will not be
protected against frost and corrosion. If
water has been added to the coolant, have
a Yamaha dealer check the antifreeze con-
tent of the coolant as soon as possible,
otherwise the effectiveness of the coolant
will be reduced.
[ECB01012]
TIP The radiator fan is automatically switched on or
off according to the coolant temperature in the
radiator.
 If the engine overheats, see page 8-68 for fur-
ther instructions. 1. Coolant reservoir cap
2. Maximum level mark
3. Minimum level markCoolant reservoir capacity (up to the maxi-
mum level mark):
0.24 L (0.25 US qt, 0.21 Imp.qt)
U2LB61E0.book Page 32 Friday, February 21, 2014 3:03 PM

10-5
10
Coolant temperature warning light:LED
EPS warning light: YFM550PF LED
YFM550PHF LED
Park indicator light: LED
On-Command four-wheel-drive/differential gear lock
indicator: LCD
Engine trouble warning light:
LED
High-range indicator light: LED
Low-range indicator light: LED
Differential gear lock indicator light:
LEDFuses:Main fuse:40.0 A
Fuel injection system fuse:
15.0 A
EPS fuse: YFM550PF 40.0 A
YFM550PHF 40.0 A
Headlight fuse: 10.0 A
Signaling system fuse: 5.0 A
Ignition fuse:
10.0 A Auxiliary DC jack fuse:
10.0 A
Four-wheel-drive motor fuse: 10.0 A
Radiator fan motor fuse:
20.0 A
EBU30402For Europe only
The figures quoted are emission levels and are not
necessarily safe working levels. Whilst there is a
correlation between the emission and exposure
levels, this cannot be used reliably to determine
whether or not further precautions are required.
Factors that influence the actual level of exposure
of work-force include the characteristics of the
work room, the other sources of noise, etc. i.e. the
number of machines and other adjacent process-
es, and the length of time for which an operator is
exposed to the noise. Also the permissible expo-
sure level can vary from country. This information,
however, will enable the user of the machine to
make a better evaluation of the hazard and risk.
U2LB61E0.book Page 5 Friday, February 21, 2014 3:03 PM

12-1
12
INDEX
AAccessories and loading ................................................ 6-6
Accessories, auxiliary jack ........................................... 4-23
Air filter element, cleaning ........................................... 8-39
Axle boots .................................................................... 8-52BBattery ......................................................................... 8-55
Brake fluid, changing ................................................... 8-49
Brake fluid level, checking ........................................... 8-47
Brake lever, front ......................................................... 4-14
Brake levers, checking and lubricating ........................ 8-53
Brake pads, checking the front and rear ..................... 8-46
Brake pedal and rear brake lever ................................. 4-14
Brake pedal, checking and lubricating ........................ 8-54
Brake pedal free play, adjusting .................................. 8-50
Brakes .......................................................................... 8-46
Brakes, front and rear .................................................... 5-3CCables, checking and lubricating ................................ 8-52
Carrier, front ................................................................. 4-21
Carrier, rear .................................................................. 4-21
Chassis fasteners .......................................................... 5-7
Cleaning ......................................................................... 9-1
Coolant .................................................................5-3, 8-31
Coolant temperature warning light ................................ 4-3DDifferential gear oil ................................................5-3, 8-29
Drive select lever ......................................................... 4-15
Drive select lever and driving in reverse ........................ 6-2Drive select lever safety system cable, adjusting ........ 8-46
EEngine break-in .............................................................. 6-4
Engine oil ....................................................................... 5-3
Engine oil and oil filter cartridge .................................. 8-22
Engine stop switch ........................................................ 4-8
Engine trouble warning light .......................................... 4-3
EPS warning light (for EPS model) ................................ 4-4FFinal gear oil ......................................................... 5-3, 8-26
Four-wheel-drive/differential gear lock indicator ........... 4-4
Front and rear brake lever free play, checking ............ 8-49
Fuel ....................................................................... 4-16, 5-3
Fuel tank cap ............................................................... 4-15
Fuses, replacing .......................................................... 8-59HHandlebar switches ....................................................... 4-7
Headlight beam, adjusting ........................................... 8-63
Headlight bulb, replacing ............................................. 8-61
High-range indicator light .............................................. 4-2
Horn switch .................................................................... 4-8IIdentification numbers ................................................. 11-1
Indicator lights and warning lights ................................. 4-2
Instruments, lights and switches ................................... 5-7LLabel locations ............................................................... 1-1
Light switch ................................................................... 4-8
Low-range indicator light ............................................... 4-2
U2LB61E0.book Page 1 Friday, February 21, 2014 3:03 PM