Northern Lights and NL1066H3, Руководство оператора

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ONL2-2 7/13
19
Servicing
SP5. BELT TENSION
1. Inspect the belt for cracks, stretched out areas, or
frays and replace if needed.
2. Twist the belt in the middle of a 10 to 12 inch span
(254- 305 mm) with two fi ngers. It should turn 75
to 85 degrees if it is properly tensioned. If it turns
more it needs to be tightened, if it can not turn that
much it needs to be loosened.
3. Install the belt tension gauge on the belt halfway
between the two pulleys.
4. Loosen the capscrews
(B & C, Figure 9)
and slide
the alternator tension bracket in it’s slot by hand to
remove the excess slack in the belt.
Note: Do not pry against the alternator rear frame.
5. Pry outward on the tension bracket or the alternator
front frame to stretch the belt, until the specifi ed
tension is achieved.
New Belt Tension .........470 -650 N (105-145 lb.-force)
Used Belt Tension.........400 -580 N (90- 130 lb.-force)
Note: New belts are considered used after ten
minutes of running time.
6. Re-tighten capscrews B & C, run engine for ten
minutes and re-check belt tension.
Reproduced by permission of Deere & Company, c2005. Deere & Company. All rights reserved.
RG10556 Figure 9
A - Belt Tension Gauge
B - Capscrew
C - Capscrew
Note: If an automatic spring tensioner is used, a
belt tension gauge will not give an accurate
measure of the belt’s tension. Measure the spring
tensioner’s tension instead, as follows.
1. Using a torque wrench, remove the belt from the
pulleys using a breaker bar and socket on the ten-
sion arm.
2. Check the pulleys and bearings while the belt is off.
See dealer if replacements are needed.
3. Release the tension on the tension arm and remove
the breaker bar.
4. Mark a line as shown
(Figure 10A)
.
5. Measure 21 mm (.83 in.) down from
(A)
and put a
line
(B)
on the tensioner mounting base.
6. Install a torque wrench
(Figure 11C)
and align the
center of the pulley and tensioner, aligning marks.
7. Record the torque wrench measurement and com-
pare it with the below specifi cation.
Spring Tension Torque .........18 -22 N•m (13-16 lb.-ft.)
Note: The belt tensioner roller capscrew threads are
Left-Hand threads.
Reproduced by permission of Deere & Company, c2005. Deere & Company.
All rights reserved.
RG7977 Figure 10
Reproduced by permission of Deere & Company, c2005. Deere & Company.
All rights reserved.
RG12065 Figure 11