check engine YAMAHA WOLVERINE 2018 Owner's Manual

8-29
8
18. When coolant begins to flow out, tightenthe bleed bolt.
19. Start the engine and let it idle for ten mi- nutes.TIPWhile the engine is idling, check the cooling
system for leaks.
20. Rev the engine five times, then stop theengine and allow it to cool.TIPWhile waiting for the engine to cool, clean up
the used coolant and prepare it for disposal
according to local regulations. 21. When the engine is cool, remove the radi-
ator cap and check the coolant level in
the radiator. WARNING! Never attempt
to remove the radiator cap when the
engine is hot.
[EWB04250]
If necessary, add
coolant until the radiator is full. Install the
radiator cap.
22. Check the coolant level in the reservoir and replenish if necessary.
23. Install the panels and the hood.
EBU32400Axle bootsCheck the axle boots for holes or tears.
If any damage is found, have them replaced
by a Yamaha dealer.
1. Cylinder head air bleed boltTightening torque: Cylinder head air bleed bolt:10 N·m (1.0 kgf·m, 7.4 lb·ft)
1
UB3D7AE0.book Page 29 Tuesday, November 7, 2017 9:38 AM

8-32
8
Installation1. Clean the surface of the spark plug gas-
ket and its mating surface, and then wipe
off any grime from the spark plug
threads.
2. Install the spark plug and tighten it to the specified torque. If a torque wrench is not
available when you are installing the
spark plug, a good estimate of the cor-
rect torque is one-quarter to one-half turn
past finger tight. Have the spark plug
tightened to the specified torque as soon
as possible.
3. Install the spark plug cap.
EBU33581Cleaning the air filter elementThe air filter element should be cleaned every
20–40 hours. It should be cleaned and lubri-
cated more often if the vehicle is operated in
extremely dusty areas. Each time air filter ele-
ment maintenance is performed, check the air
inlet to the air filter case for obstructions.
Check the air filter elem ent rubber joint to the
throttle body and manifold fittings for an air-
tight seal. Tighten all fittings securely to avoid
the possibility of unfiltered air entering the en-
gine.NOTICEECB02270Never operate the engine with the air filter
element removed. Doing so would allow
unfiltered air to enter, causing rapid en-
gine wear and possible engine damage.
Additionally, the fuel injection system
would be affected, re sulting in poor engine
performance and possible overheating.
Spark plug gap: 0.8–0.9 mm (0.031–0.035 in)
Tightening torque: Spark plug:11 N·m (1.1 kgf·m, 8.1 lb·ft)
UB3D7AE0.book Page 32 Tuesday, November 7, 2017 9:38 AM

8-37
8
EBU33691V-belt case drain plugThe V-belt case drain plug is located behind
the left panel. (See page 8-11 for left panel re-
moval and installation procedures.)
After operating in water deep enough to allow
water to enter the V-belt case, remove the
drain plug to drain any water from the case.
If water drains from the V-belt case after re-
moving the drain plug, have a Yamaha dealer
inspect the vehicle, as the water may affect
other engine parts.
EBU32450Cleaning the spark arrester
WARNING
EWB03370Hot exhaust system may cause burns. To
avoid burns or fires, make sure that the en-
gine is stopped and the exhaust system is
cool before cleaning the spark arrester. Do
not start the engine while cleaning the ex-
haust system. 1. Remove the tailpipe bolts.
1. Air intake duct check hose
2. Air filter case check hose2
1
1. V-belt case drain plug
1
UB3D7AE0.book Page 37 Tuesday, November 7, 2017 9:38 AM

8-39
8
EBU32460Valve clearanceThe correct valve clearance changes with
use, resulting in improper fuel/air supply or
engine noise. To prevent this, the valve clear-
ance must be adjusted regularly. This adjust-
ment however, should be left to a
professional Yamaha service technician.EBU32470BrakesReplacement of brake components requires
professional knowledge. Brake service
should be performed by a Yamaha dealer.
WARNING
EWB02572Operating with improperly serviced or ad-
justed brakes could lead to a loss in brak-
ing ability and an accident.
EBU32480Checking the front and rear brake padsEach brake pad is provided with wear indica-
tor grooves, which allow you to check the
brake pad wear without having to disassem-
ble the brake. To check the brake pad wear,
check the wear indicator grooves. If a brake
pad has worn to the point that the wear indi-
cator grooves have almost disappeared, have
a Yamaha dealer replace the brake pads as a
set.
The wheels need to be removed to check the
brake pads. (See pages 8-45, 8-47 for wheel
removal and installation procedures.)
UB3D7AE0.book Page 39 Tuesday, November 7, 2017 9:38 AM

8-52
8
5. Start the engine. (See page 6-2.)
6. After the engine starts, disconnect thenegative lead of the jumper cable from
the frame and charged battery, and then
disconnect the positive lead of the jump-
er cable from the charged battery and the
battery in the vehicle.
7. Install the hood.
EBU32663Fuse replacementThe fuses are located under the hood. If an
electrical problem is suspected, check the
fuses and replace if necessary.
General layout
1. Jumper cable negative lead
1
1. Fuse box
2. Main fuse
3. EPS fuse
4. Fuel injection system fuse
5. Fuel injection system spare fuse
1 3
2
4
5
UB3D7AE0.book Page 52 Tuesday, November 7, 2017 9:38 AM

8-54
8
4. Turn on the main switch, start the engine,and turn on the electr ical circuit in ques-
tion to check if the device operates. If the fuse blows again immediately, have a
Yamaha dealer check the electrical sys-
tem.
5. Install the hood.
EBU32671Replacing a headlight bulbIf a headlight bulb burns out, replace it as fol-
lows. 1. Remove the cover at the rear of the head-
light by pulling it off.
2. Remove the headlight bulb cover by pull- ing it off.
Specified fuses:Main fuse:40.0 A
Fuel injection system fuse: 10.0 A
Headlight fuse: 15.0 A
Ignition fuse: 10.0 A
Auxiliary DC jack fuse: 10.0 A
Signaling system fuse: 10.0 A
Four-wheel-drive motor fuse: 10.0 A
Radiator fan motor fuse: 25.0 A
Backup fuse: 10.0 A
EPS fuse: 40.0 A
1. Cover at the rear of the headlight
1
UB3D7AE0.book Page 54 Tuesday, November 7, 2017 9:38 AM

8-59
8
EBU32712Troubleshooting chartsStarting problems or poor engine performanceCheck the fuel level in
the fuel tank.1. Fuel
There is enough fuel.There is no fuel.
Check the battery.
Supply fuel.
The engine does not start.
Check the battery.
Operate the electric starter.4. Compression
There is compression.
There is no compression.
The engine does not start.
Have a Yamaha dealer check the vehicle.Have a Yamaha dealer check the vehicle.
Remove the spark plug
and check the electrodes.3. Ignition
Wipe off with a dry cloth and correct the
spark plug gap, or replace the spark plug. Have a Yamaha dealer check the vehicle.
The engine does not start.
Check the compression.
Operate the electric starter.2. Battery
The engine turns over
quickly.
The engine turns over
slowly.
The battery is good.
DryWet
Operate the electric starter.
Check the battery lead connections,
and have a Yamaha dealer charge
the battery if necessary.
The engine does not start.
Check the ignition.
UB3D7AE0.book Page 59 Tuesday, November 7, 2017 9:38 AM

8-60
8
Engine overheating
Wait for the engine to cool before removing the radiator cap. WARNING! If the engine is not
cool when removing the radiator cap, hot fluid and steam could blow out under pressure
and burn you.
[EWB03460]
Place a thick rag over the cap and remove the cap slowly to allow any re-
maining pressure to escape.
TIP Tap water can be used in an emergency. Change to the recommended coolant as soon as
possible.
 The engine will tend to overheat if the radiator is caked with mud, or if air was not properly bled
from the cooling system. Wait until the
engine has cooled.
Check the coolant le vel in the
coolant reservoir and/or radiator.
Level is OK.Level is low, check the
cooling system for leakage.
No
leakage.Leakage.
Ask a Yamaha dealer to inspect
and repair the cooling system.Add coolant. (See TIP.)
Restart the engine. If the engine o verheats again, ask a
Yamaha dealer to inspect and/or repair the cooling system.
UB3D7AE0.book Page 60 Tuesday, November 7, 2017 9:38 AM

12-1
12
INDEX
AAccelerator pedal ......................................................... 4-12
Accelerator pedal, Pre-operation check ........................ 5-6
Air filter check hoses .................................................... 8-36
Air filter element, cleaning ............................................ 8-32
Auxiliary DC jack .......................................................... 4-33
Axle boots .................................................................... 8-29BBasic guide for safe use ................................................. 7-1
Battery, Periodic maintenance ..................................... 8-47
Brake fluid level, checking ........................................... 8-40
Brake fluid, replacing ...................................................8-41
Brake light switch, adjusting ........................................ 8-42
Brake pedal .................................................................. 4-13
Brake pedal and accelerator pedal, lubrication ........... 8-43
Brake pedal, checking ................................................. 8-42
Brakes, Periodic maintenance ..................................... 8-39
Brakes, Pre-operation check ......................................... 5-3CCable, inspecting and lubrication ................................ 8-43
Cargo bed .................................................................... 4-20
Cleaning ......................................................................... 9-1
Control cables, Pre-operation check ............................. 5-8
Coolant, Periodic maintenance .................................... 8-25
Coolant, Pre-operation check ........................................ 5-6
Coolant temperature warning light ................................. 4-4
Cup holders .................................................................. 4-20DDifferential gear lock indicator light ............................... 4-3Differential gear oil, Periodic maintenance .................. 8-22
Differential gear, Pre-operation check ........................... 5-6
Doors ........................................................................... 4-14
Driver seat position ...................................................... 4-16
Drive select lever .......................................................... 4-14
Drive select lever operation and reverse driving ............ 6-3
Drivetrain icon ................................................................ 4-3
EEngine break-in .............................................................. 6-1
Engine oil and oil filter cartridge, Periodic
maintenance .............................................................. 8-14
Engine oil, Pre-operation check ..................................... 5-5
Engine trouble warning light .......................................... 4-4
EPS warning light ........................................................... 4-5FFinal gear oil, Periodic maintenance ............................ 8-20
Final gear, Pre-operation check ..................................... 5-6
Fittings and fasteners, Pre-operation check .................. 5-7
Four–wheel drive knob (On–Command 4WD) .............. 4-11
Front and rear brake pads, checking ........................... 8-39
Fuel, Pre-operation check .............................................. 5-3
Fuel tank cap ............................................................... 4-14
Fuse, replacing ............................................................. 8-52GGlove compartment ..................................................... 4-18HHeadlight beam, adjusting ........................................... 8-56
Headlight bulb, replacing ............................................. 8-54
Helmet indicator light ..................................................... 4-5
High-range indicator light .............................................. 4-2
Hood ............................................................................ 8-10
UB3D7AE0.book Page 1 Tuesday, November 7, 2017 9:38 AM

12-2
12
Horn switch .................................................................. 4-12IIdentification number records ...................................... 11-1
Indicator lights and warning lights ................................. 4-2
Instruments, lights and switches, Pre-operation check ........................................................................... 5-8JJump-starting .............................................................. 8-51LLabel locations ............................................................... 1-1
Light switch .................................................................. 4-11
Loading .......................................................................... 6-7
Low-range indicator light ............................................... 4-2MMain switch .................................................................... 4-1
Maintenance charts ....................................................... 8-4
Model label .................................................................. 11-1
Multi-function meter unit ............................................... 4-6NNeutral indicator light ..................................................... 4-3OOn-Command drive knob, operation ............................. 6-5
Owner’s Manual and tool kit .......................................... 8-2PPanels .......................................................................... 8-11
Parking ........................................................................... 6-7
Parking brake ............................................................... 8-42
Parking brake indicator light .......................................... 4-3
Parking brake lever ...................................................... 4-13
Passenger handhold, Pre-operation check ................... 5-7
RRear knuckle upper and lower pivot, lubrication ......... 8-45
Reverse indicator light ................................................... 4-3SSafety information .......................................................... 2-1
Seat belt indicator light .................................................. 4-5
Seat belts ..................................................................... 4-17
Seat belts, Pre-operation check .................................... 5-7
Seats ............................................................................ 4-15
Shock absorbers, front ................................................ 4-22
Shock absorbers, rear ................................................. 4-27
Spark arrester, cleaning ............................................... 8-37
Spark plug, inspecting ................................................. 8-30
Specifications .............................................................. 10-1
Stabilizer bushes, checking .......... ............................... 8-44
Starting the engine ........................................................ 6-2
Steering, Pre-operation check ....................................... 5-7
Steering shaft, lubrication ............................................ 8-45
Storage .......................................................................... 9-2
Storage compartments ................................................ 4-18TTail/brake light bulb, replacing .................................... 8-57
Tire, replacing .............................................................. 8-46
Tires, Pre-operation check ............................................ 5-8
Trailer hitch bracket and receiver ................................ 4-32
Troubleshooting ........................................................... 8-57
Troubleshooting charts ................................................ 8-59VValve clearance ............................................................ 8-39
V-belt case drain plug .................................................. 8-37
Vehicle identification number ...................................... 11-1
UB3D7AE0.book Page 2 Tuesday, November 7, 2017 9:38 AM