REV A 4-4 122832
Slight raveling of belt covering does not indicate failure,
trim ravelings with a sharp knife.
Inspect the belt pulley grooves and flanges for wear. A new
belt, or one in good condition, should never run against the
bottom of the groove. Replace the pulley when this is the
case, otherwise, the belt will lose power and slip excessively.
Never pry a belt to get it on a pulley as this will cut or dam-
age the fibers of the belt covering.
Keep oil and grease away from belts, and never use belt
dressings. Any of these will destroy the belt composition in a
very short time.
Hydraulic Pump Belt Adjustment
The transmission drive belt tension remains constant by
means of a tension idler and spring. The spring tension
should be such that the belt does not slip under normal oper-
ating load conditions, assuming the belt is not excessively
worn or damaged. As the belt stretches and wears in, adjust-
ment may become necessary.
The proper belt tension is achieved when the tension
spring is stretched to a dimension of 7.80” ± .125”
(198.12mm ± 3.18mm) when measured from the outside of
the hook to the outside of the other hook. Figure 4-8
To increase belt tension, loosen the jam nut on the eye
bolt. Then, tighten the nut on the eyebolt until the
7.80” ± .125” (198.12mm ± 3.18mm) dimension is attained.
Lock the eyebolt in place by tightening the jam nut.
Figure 4-8
IMPORTANT: Do not over tension the spring to compen-
sate for a badly worn belt or pulley.
Inspect the belt every 100 hours and replace as needed.
Replace the belt every 400 hours or every two (2) years
whichever comes first.
Left side shown
A. Carriage bolts
B. Treadlock plate
C. Slot
Figure 4-6
Right side shown
A. Carriage bolts
B. Treadlock plate
C. Hardware
D. Brake link
E. Treadlock mounting bar
F. Slot
Figure 4-7
If the pump belt fails, loss of steering control will
occur especially when operating on a slope. If you
lose steering control while operating the mower, turn
the engine off and, if on a slope, step off of the oper-
ator’s platform to the uphill side. Inspect the
machine and involve your Big Dog
®
Mower Dealer to
resolve the problem before continuing to operate.
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