2004 YAMAHA BIG BEAR PRO 400 oil level

8-23 1. Bolt (× 3)
1. Boulon (× 3)
1. Perno (× 3)
1. Oil filler bolt
1. Boulon de l’orifice de remplissage d’huile
1. Perno del orificio de llenado de aceite
EBU00462
Transfer gear oil replacementNOTE:When replacing the transfer gear oil, replace the
engine oil also.1. Remove the transfer gear case guard.
2. Place the machine on a level place.
3. Place a container under the transfer gear
case.
4. Remove the oil filler bolt and drain bolt to
drain the oil.
5. Install the drain bolt and tighten to specifica-
tion.
Tightening torque:
Drain bolt (transfer gear case):
20 Nm (2.0 m·kgf)
E-8.fm Page 23 Thursday, May 29, 2003 11:49 AM

8-27 1. Final gear oil 2. Correct oil level
3. Oil filler bolt
1. Huile de transmission finale 2. Niveau d’huile correct
3. Boulon de l’orifice de remplissage d’huile
1. Aceite de la transmisión final 2. Nivel de aceite correcto
3. Perno del orificio de llenado de aceite
1. Bolt (× 3)
1. Boulon (× 3)
1. Perno (× 3)
EBU11452
Final gear oil
Final gear oil measurement
1. Place the machine on a level surface.
2. Remove the oil filler bolt, and then check the
oil level in the final gear case.NOTE:_ The oil level should be at the brim of the filler hole. _3. If the oil is below the brim of the filler hole,
add sufficient oil of the recommended type to
raise it to the correct level.CAUTION:_ Be sure no foreign material enters the final
gear case. _4. Install the oil filler bolt.
Final gear oil replacement
1. Remove the final gear case cover by remov-
ing the bolts.
2. Place the machine on a level surface.
3. Place a container under the final gear case to
collect the used oil.
U4SH6B.book Page 27 Tuesday, May 27, 2003 4:39 PM

8-31 1. Oil filler bolt
1. Boulon de l’orifice de remplissage d’huile
1. Perno del orificio de llenado de aceite
7. Install the oil filler bolt.
8. Check for oil leakage. If oil leakage is found,
check for the cause.
9. Install the final gear case cover bolts, and
then tighten them to the specified torque.
EBU00826
Differential gear oil replacement
1. Place the machine on a level place.
2. Place a container under the differential gear
case to collect the used oil.
3. Remove the filler bolt and drain bolts to drain
the oil. Tightening torque:
Final gear case cover bolt:
23 Nm (2.3 m·kgf)
U4SH6B.book Page 31 Tuesday, May 27, 2003 4:39 PM

8-59
Observe these precautions:

When checking the brake fluid level, make sure
the top of the brake fluid reservoir is level.


Use only the designated quality brake fluid, oth-
erwise, the rubber seals may deteriorate, caus-
ing leakage and poor brake performance.


Refill with the same type of brake fluid. Mixing
fluids may result in a harmful chemical reaction
and lead to poor brake performance.


Be careful that water does not enter the brake
fluid reservoir when refilling. Water will signifi-
cantly lower the boiling point of the fluid and
may result in vapor lock.


Brake fluid may deteriorate painted surfaces or
plastic parts. Always clean up spilled fluid im-
mediately.


Have a Yamaha dealer check the cause if the
brake fluid level goes down. Recommended brake fluid: DOT 4
U4SH6B.book Page 59 Tuesday, May 27, 2003 4:39 PM

10-2
10
Noise and vibration level:
Noise level (77/311/EEC) 87.1 dB (A)
Vibration on seat (EN1032, ISO5008) Will not exceed 0.5 m/s
2
Vibration on handlebar (EN1032, ISO5008) Will not exceed 2.5 m/s
2
Engine oil/Transfer gear oil:
Type
Recommended engine oil classification: API Service SE, SF, SG type or higherModel YFM400FP/YFM400FW
-20˚ -10˚ 0˚
10˚20˚ 30˚40˚50˚C
10W/30
15W/4020W/4020W/50
10W/40
5W/30
CAUTION:
In order to prevent clutch slippage (since the en-
gine oil also lubricates the clutch), do not mix any
chemical additives. Do not use oils with a diesel
specification of “CD” or oils of a higher quality
than specified. In addition, do not use oils labeled
“ENERGY CONSERVING II” or higher.
U4SH6B.book Page 2 Tuesday, May 27, 2003 4:39 PM