Symptom Cause Remedy Ref.
Engine gets too hot (ac-
cording to coolant tem-
perature indicator)
26. Insufficient coolant ► Fill up, ventilate
27. Defective coolant tempera-
ture sensor or gauge
► Replace sensor or gauge
28. Drive belt damaged ► Replace drive belt
29. Fan is not activated correctly ► Consult a professional serv-
ice centre
30. Inside of radiator dirty or cal-
cified, outside of radiator
very dirty
► Clean or descale
31. Defective thermostat ► Check components, replace
if necessary, consult a pro-
fessional service centre
Charging current warn-
ing lamp comes on
when engine is running
32. Insufficient drive belt tension ► Check if belt tensioner
works properly
33. Drive belt ruptured ► Replace drive belt
34. Defective alternator or con-
trol unit
► check; contact qualified,
specialist workshop
Engine emits black
smoke
35. Air filter dirty or blocked ► Replace filter insert
36. Defective turbocharger ►
37. Faulty combustion, defective
injection
► Consult a professional serv-
ice centre
Blue exhaust gas 38. Engine oil level too high,
crankcase ventilation defec-
tive, engine oil leaking into
combustion chamber
► Rectify oil level, have quali-
fied personnel check crank-
case ventilation
White exhaust gas 39. Coolant getting into the com-
bustion chamber or poor fuel
combustion
► Pressure loss test; consult
a professional service cen-
tre.
Engine "rattles" 40. Faulty combustion ► Consult a professional serv-
ice centre
Engine "knocks" 41. Bearing damage ► Consult a professional serv-
ice centre
Unusual noises 42. Leakage in intake and ex-
haust system causes whis-
tling noise
► Fix leakage, replace seals if
necessary
43. Turbine rotor or compressor
wheel scrapes against case;
foreign bodies in compressor
or turbine; seized bearings in
the rotating parts
► Have qualified personnel
check the turbocharger
44. Excessive valve clearance ► Check valve clearance, ad-
just if necessary
Snow groomer BISON
Operating and Maintenance Manual
BISON 908930245 - 30367
12 - Troubleshooting
195 (255)
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