Manitou F-E3 Series Operator's Manual page 150

C - EVERY 250 HOURS SERVICE
C1 - FAN BELT TENSION
- Open the I.C. engine bonnet.
- Check the belt for signs of wear and cracks and change if necessary (see: 3 - MAINTENANCE:
FILTERS CARTRIDGES AND BELTS).
- Loosen screw 1 (fig. C1/1) on the tension pulley.
- Loosen lock nut 2 (fig. C1/1 and C1/2) and screw 3 (fig. C1/1 and C1/2).
- Tighten the screw 2 (fig. C1/1 and C1/2) until the belt is as close as possible to the
groove of the pulley 4 (fig. C1/1).
- Make a mark on the head of screw 3 (fig. C1/1 and C1/2) and tighten, turning it 5
times.
- Tighten the lock nut 2 (fig. C1/1 and C1/2).
- Retighten screw 1 (fig. C1/1) on the tension pulley.
When changing the fanbelt, tighten screw 3 (fig. C1/1 and C1/2) by one and a half turns, having allowed
the I.C. engine to idle for 30 minutes.
C2 - ALTERNATOR/CRANKSHAFT BELT TENSION
MLT 634 Turbo LSU Série F-E3
MLT 731 Turbo Série F-E3
MLT 735 Turbo LSU Série 6-E3
MLT 741 Turbo LSU Série 6-E3
- Open the I.C. engine bonnet.
- Unscrew the fastening screws 1 (fig. C2/1).
- Lay down the protective guard 2 (fig. C2/1).
- Check the belt for signs of wear and cracks and change if necessary (see: 3 - MAINTENANCE:
FILTERS CARTRIDGES AND BELTS).
- Check the belt tension between the pulleys of the crankshaft and of the alternator.
- Under a normal pressure exerted with the thumb (45 N), the belt should move approximately
10 mm.
- Carry out adjustments if necessary.
- Untighten screws 3 (fig. C2/2) by two to three thread turns.
- Swivel the alternator assembly so as to obtain the belt tension required.
- Retighten screws 3 (fig. C2/2) (tightening torque 22 N.m).
- Put the protective guard back 2 (fig. C2/1).
If the alternator belt has to be changed, check the tension again after the first 20 hours of operation.
Carry out the operations described previously as well as the following operations.
CHECK - ADJUST
CHECK - ADJUST
3-26
C1/1
3
2
1
4
C1/2
3
2
C2/1
2
1
1
C2/2
3
3
3