1-31-3THDC / THDCP - 954 / 955 / 974 (Rev. 06/03)THDC / THDCP - 954 / 955 / 974 (Rev. 06/03)
IllustIllustration 1-ration 1-3. 3. Fan DriFan Drive Beltve Belt
ADJUSTING
ADJUSTING
SCREW LOCKNUTSCREW LOCKNUT
ADJUSTMENTADJUSTMENT
LINK LOCKINGLINK LOCKING
CAPSCREWCAPSCREW
PIVOT CAPSCREWPIVOT CAPSCREW
AND NUTAND NUT
IllustrIllustration 1-4. ation 1-4. Alternator DAlternator Drive Beltrive Belt
Fan Drive Belt TensionFan Drive Belt Tension(Illustration 1-3)(Illustration 1-3).. TheThe
tension of the fan drive belt should be 200 - 240tension of the fan drive belt should be 200 - 240
ft-lbs (890 - 1070 Nft-lbs (890 - 1070 N
⋅⋅
m) for a used belt and 300m) for a used belt and 300
ft-lbs (1330 Nft-lbs (1330 N
⋅⋅
m) for a new belt. A belt is consid-m) for a new belt. A belt is consid-
ered used if it has been in operation for 10 min-ered used if it has been in operation for 10 min-
utes or longerutes or longer. . If the used belt tensiIf the used belt tension is less thanon is less than
the minimum tension value, tighten the belt to thethe minimum tension value, tighten the belt to the
maximmaximum tension value. um tension value. TTo obtain the proper belto obtain the proper belt
tension value, use an appropriate belt tensiontension value, use an appropriate belt tension
gauge. gauge. Perform Perform the followthe following proceduring procedures toes to
adjust the tension of the belt.adjust the tension of the belt.
CAUTION:CAUTION:Do not adjust belt tension toDo not adjust belt tension to
the maximum value with the adjusting screw.the maximum value with the adjusting screw.
Belt tension can increase when the locknut isBelt tension can increase when the locknut is
tightened and cause reduced belt and bearingtightened and cause reduced belt and bearing
life.life.
1. 1. LoosLoosen the idleen the idler pullr pulley shafey shaft lockt locknut.nut.
2. 2. AdjuAdjust the belst the belt to the cort to the correcrect tensit tension by turnon by turninging
the adjusting screw clockwise until the properthe adjusting screw clockwise until the proper
belt tension is obtained (seebelt tension is obtained (seeCautionCautionabove).above).
3. 3. TTightighten the idlen the idler puller pulley shafey shaft lockt locknut to anut to a
torque value of 140 ft-lbs (190 Ntorque value of 140 ft-lbs (190 N
⋅⋅
m).m).
4. 4. ChecCheck the belt tk the belt tensiension again to mon again to make surake sure thee the
belt is adjusted to the correct value.belt is adjusted to the correct value.
Alternator Drive Belt TensionAlternator Drive Belt Tension(Illustration 1-4)(Illustration 1-4)..
The tension of the alternator drive belt should beThe tension of the alternator drive belt should be
60 - 120 ft-lbs (270 - 530 N60 - 120 ft-lbs (270 - 530 N
⋅⋅
m) for a used belt andm) for a used belt and
150 ft-lbs (670 N150 ft-lbs (670 N
⋅⋅
m) for a new bem) for a new belt. lt. A belt is cA belt is con-on-
sidered used if it has been in operation for 10 min-sidered used if it has been in operation for 10 min-
utes or longerutes or longer. . If the used belt tensiIf the used belt tension is less thanon is less than
the minimum tension value, tighten the belt to thethe minimum tension value, tighten the belt to the
maximmaximum tension value. um tension value. TTo obtain the proper belto obtain the proper belt
tension value, use an appropriate belt tensiontension value, use an appropriate belt tension
gauge. gauge. Perform Perform the followthe following proceduring procedures toes to
adjust the tension of the belt:adjust the tension of the belt:
1. 1. LoosLoosen the adjen the adjustiusting scrng screw locew locknutknut..
2. 2. Loosen the adjLoosen the adjustment ustment link llink locking cocking capscrewapscrew..
3. 3. LoosLoosen the pien the pivot cvot capscapscrew rew and nutand nut..
4. 4. AdjusAdjust the belt to tht the belt to the corre correct teect tensionsion by turnin by turningng
the adjusting screw clockwise until the properthe adjusting screw clockwise until the proper
belt tension is obtained.belt tension is obtained.
5. 5. TiTighten the ghten the adjusting adjusting screw screw locknut locknut againstagainst
the retainer.the retainer.
6. 6. TiTighten the adjghten the adjustment ustment link llink locking cocking capscrewapscrew
to a to a torqtorque value of 60 ue value of 60 ft-ft-lbs (80 Nlbs (80 N
⋅⋅
m).m).
7. 7. TTightighten the piven the pivot capsot capscrew acrew and nut to a torqund nut to a torquee
value of 35 ft-lbs (47 Nvalue of 35 ft-lbs (47 N
⋅⋅
m).m).
Engine Cleaning.Engine Cleaning. The engine must be steamThe engine must be steam
cleaned every 6 months or 1500 hours, whichevercleaned every 6 months or 1500 hours, whichever
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