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4. Slide the drive belt over the edge of the stationary
idler pulley (B). Carefully release the tension on
the breaker bar until the idler arm comes to a
stop.
6. Unhook the idler tension spring (C) from the
anchor bolt (D). Remove the old belt and replace
with a new one. Make sure the V-side of the belt
runs in the pulley grooves.
7. Install the drive belt on the PTO pulley, the spindle
pulleys, and all idler pulleys except the stationary
pulley. Rehook the idler tension spring from the
anchor bolt. Carefully rotate the breaker bar
COUNTER-CLOCKWISE and install the belt on
the stationary idler pulley. Carefully release the
tension on the breaker bar. The belt should be
routed exactly as shown in Figure 28.
8. Reinstall the mower deck guard.
9. Run the mower under no-load condition for about
5 minutes to break-in the new belt.
Check / Adjust the Mower Belt Idler
Tensioner Spring Length
52” & 61” Models - S/N: 2015782584 & Below:
feature a stationary mower belt idler tensioner and
cannot be adjusted.
48” Models - All; 52” & 61” Models - 2015782585
& Above: feature an adjustable mower belt idler
tensioner which must be to checked to make sure the
mower deck belt is set to the correct tension.
1. Position the mower deck at its middle cutting
position.
2. Use the Mower Belt Idler Tensioner Spring Length
chart to determine the correct spring length
Mower Belt Idler Tensioner Spring Length
48” Mower Decks 5-3/4” (14.6 cm)
52” Mower Decks 6-1/2” (16.5 cm)
61” Mower Decks
(S/N: 2015782585 - 2016203069)
6-1/2” (16.5 cm)
61” Mower Decks
(S/N: 2016203070 & Above)
6-3/4” (17.1 cm)
2. Measure the coil length of the mower
belt tensioner spring (A, Figure 29). The
measurement should equal the measurement as
indicated in the chart. If it does not, adjustment is
necessary, continue with step # 3.
3. Loosen the jam nut (C).
4. Turn the adjustment nut (D) until the measurement
as indicated in the chart is achieved.
5. Retighten the jam nut.
36
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Troubleshooting, Adjustment & Repair
B
C
Figure 28. Mower PTO Belt Routing
A. Spindle Pulley
B. PTO Drive Belt
C. Stationary Idler Pulley
D. Spring-loaded Idler Pulley
A
D
A
A
C
Figure 29. Check / Adjust the Mower Belt Idler
Tensioner Spring Length
A. Mower Belt Tensioner Spring
B. Measurement
C. Jam Nut
D. Adjustment Bolt
A
B
C
D
Not for
Reproduction