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Lubrication & Maintenance/500 Hour/12 Month
DPSG,RG41165,128 –19–27JUL06–1/1
Manual Belt Tensioner Adjustment
RG10556 –UN–21DEC99
Check Belt Tension
RG10557 –UN–21DEC99
Adjust Belt Tension
A—Belt Tension Gauge
B—Cap Screw
C—Cap Screw
D—Tensioner Bracket
NOTE: Two types of manual tensioners shown.
NOTE: Inspect belts for cracks, fraying, or stretched-out
areas. Replace if necessary.
As a reference check, twist belt in the middle of a
254—305 mm (10—12 in.) span with two fingers.
A properly tensioned belt will turn 75—85
degrees. If belt turns more, it needs to be
tightened. If belt turns less, it needs to be
loosened.
NOTE: If timing gear cover or alternator bracket interfere
with installation/centering of belt tension gauge
(A), install gauge with face toward engine.
1. Install JDG1341 Belt Tension Gauge (A) on belt,
halfway between pulleys as shown. (JDG1341 Belt
Tension Gauge available from local John Deere Dealer
or Distributor.)
2. Loosen cap screws (B) and (C).
3. Slide alternator or tensioner bracket (D) in slot by hand
to remove all excess slack in belt.
IMPORTANT: Do not pry against alternator rear frame.
4. Stretch belt by prying outward on alternator front frame
or tensioner bracket. Observing tension gauge, stretch
the belt until specified tension is achieved.
Specification
New Belt—Tension 470—650 N (105—145 lb-force).................................
Used Belt—Tension 400—580 N (90—130 lb-force)..................................
5. Tighten cap screws (B) and (C).
NOTE: After ten minutes run-in, new belts are considered
used. Belt tension must then be rechecked per
used belt specifications.
6. Run engine for ten minutes and immediately re-check
belt tension per used belt specification above.
7. Reset belt tension as necessary.
30-4
080706
PN=141