Checking Noises - Yamaha 2016 Grizzly yfm700gplg Service Manual

EBS30237

CHECKING NOISES

1. Investigate any unusual noises.
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The following "noises" may indicate a me-
chanical defect:
a. A "rolling rumble" noise during coasting, ac-
celeration, or deceleration. The noise in-
creases with front and/or rear wheel speed,
but it does not increase with higher engine or
transmission speeds.
Diagnosis: Possible wheel bearing damage.
Refer to "TROUBLESHOOTING CHART" on
page 8-3.
b. A "whining" noise that varies with accelera-
tion and deceleration.
Diagnosis: Possible incorrect reassembly,
too little gear backlash.
Refer to "TROUBLESHOOTING CHART" on
page 8-3.
EWB02900
WARNING
Insufficient gear backlash is extremely de-
structive to the gear teeth. If a test ride, fol-
lowing reassembly, indicates these
symptoms, stop riding immediately to mini-
mize gear damage.
c. A slight "thunk" evident at low speed opera-
tion. This noise must be distinguished from
normal vehicle operation.
Diagnosis: Possible broken gear teeth.
EWB02910
WARNING
Stop riding immediately if broken gear teeth
are suspected. This condition could result in
the shaft drive assembly locking up, causing
a loss of control and possible injury to the
rider.
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2. Check:
• Drained oil
Drained oil shows large amounts of metal
particles → Check the bearing for seizure.
TIP
A small amount of metal particles in the oil is nor-
mal.
3. Check:
• Oil leakage
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a. Clean the entire vehicle thoroughly, then dry
it.
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b. Apply a leak-localizing compound or dry pow-
der spray to the shaft drive.
c. Road test the vehicle for the distance neces-
sary to locate the leak.
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Leakage → Check the component housing,
gasket, and/or seal for damage.
Damage → Replace the component.
TIP
• An apparent oil leak on a new or nearly new ve-
hicle may be the result of a rust-preventative
coating or excessive seal lubrication.
• Always clean the vehicle and recheck the sus-
pected location of an apparent leakage.
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8-2
TROUBLESHOOTING
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