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Note: The proper mower belt tension is 10-15 lbf.
(44-67 N) with the belt deflected 1/2 inch (13 mm)
halfway between the pulleys (Figure 38).
1. Mower belt with 1/2 inch
(13mm) deflection
Adjusting the Mower Belt
Tension
Adjusting the Tension
Service Interval: After the first 8 hours
After the first 25 hours
Every 50 hours
Adjust the mower belt tension as follows:
• After the first 8 operating hours.
• After the first 25 operating hours.
• After every 50 operating hours.
Check the belt tension after the first 8 operating hours
and 25 operating hours thereafter. Check the belt
tension after every 50 operating hours.
Important: The belt must be tight enough to not
slip during heavy loads while cutting grass. Over
tensioning the belt will reduce the spindle bearing
life, the belt life and the idler pulley life.
Important: The brake needs to be adjusted when
the belt tension or the brake linkage is adjusted.
Figure 38
2. Idler pulley
1. Disengage the blade control (PTO) lever and set the
parking brakes.
2. Stop the engine and wait for all moving parts to stop
before leaving the operating position.
3. Loosen the locknut on the turnbuckle (Figure 39).
4. Rotate the turnbuckle toward the rear of the
mower to increase the tension on the belt. Rotate
the turnbuckle toward the front of the mower to
decrease the tension on the belt (Figure 39).
Note: The eyebolt threads on both ends of the
turnbuckle should be engaged a minimum of
5/16 inch (8 mm).
1. 1/2 inch (13 mm) deflection
here
2. Assist arm
3. Front stop
5. Engage the bladed control lever (PTO) and check
the belt tension.
6. If there is no adjustment left in the turnbuckle and
the belt is still loose, the rear idler pulley needs to be
positioned to the middle or front hole (Figure 40).
Use the hole that will give the correct adjustment.
7. When the idler pulley is moved the belt guide must
be moved. Move the belt guide to the front position
(Figure 40).
37
Figure 39
4. Locknut
5. Turnbuckle
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