Toro Z557 Z Master - Adjusting Toro Mower Belt Tension

Figure 51
1. Belt cover 3. Insert slot into the tab
2. Latch
Adjusting the Mower Belt
Tension
1. Diseng ag e the PTO , mo v e the motion control
lev ers to the neutral loc k ed position, and set
the parking brak e .
2. Stop the engine , remo v e the k ey , and w ait for
all mo ving par ts to stop before lea ving the
operating position.
3. Raise the mo w er to the transpor t position.
Important: Check the amount of twist
in the belt betw een the pulleys. Mak e sur e
it is onl y what is specified in Figur e 50 .
Important: Check and mak e sur e the
belt is installed into both the fr ont and r ear
belt guides ( Figur e 52 ).
4. Chec k the belt tension. T he spring loaded idler
center bolt needs to be near the top alignment
hole in left suppor t plate ( Figure 52 ).
Figure 52
1. Center bolt 3. Left support plate
2. Alignment hole 4. Spring loaded idler
5. If adjustment is required, loosen the mo w er
idler plate and adjust it ( Figure 53 ).
6. Inser t a ratc het or break er bar into the square
hole in the mo w er idler plate to adjust the
tension ( Figure 53 ).
7. T o increase belt tension, rotate the mo w er idler
plate until resistance is felt and rotation stops .
Do not g o past when it stops ( Figure 53 ).
8. Tighten the idler plate bolts ( Figure 53 ).
Figure 53
1. Mower idler plate 3. Ratchet or breaker bar
2. Square hole 4. Idler plate bolt
9. Chec k the distance from the r ubber stop and
the ar m of the spring loaded idler pulley when
the idler plate is tightened. It needs to be 0 to
1/4 inc h (0 to 6 mm) from the r ubber stop
( Figure 54 ).
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