Gravely Promaster 160 Owner's/Operator's Manual page 21

8. Replace PTO mower belt on PTO clutch sheave. See
Replacing Mower Belts on page 20.
5
1
3
4
1. Hydro Belt
2. Spring
3. Idler
4. Engine Sheave
MOWER DECKS
Anti-scalp Roller Adjustment
The anti-scalp rollers are set at the factory for typical
mowing height, but can be adjusted for high or low cutting
conditions (Figure 18).
Anti-Scalp rollers are intended to prevent lawn scalping, not
to control cutting height.
For a very high cutting height, set the anti-scalp rollers in the
lowest position on the bracket.
For a very low cutting height, set the anti-scalp rollers in the
highest position on the bracket.
NOTE: There are four anti-scalp rollers on the outside of the
mower deck and four anti-scalp rollers on the inside of the
mower deck. Make sure all anti-scalp rollers are set at the
same height.
Lowest
Cutting
Height
Highest
Cutting
Height
Figure 18
7
8
5. Left Hand Hydrostat
6. Right Hand Hydrostat
7. Clutch
8. Clutch Anchor
Figure 17
MOWER LIFT PEDAL ADJUSTMENT
The mower lift pedal can be adjusted to decrease or
increase the amount of force required to lift the mower deck.
NOTE: Decreasing the amount of force required to lift the
mower deck will increase the mower deck's bouncing.
6
Increasing the amount of force required to lift the mower
deck will decrease the mower deck's bouncing.
IMPORTANT: Adjust the mechanical lift spring on each side
2
of the unit to the same length.
• Adjust the eye-bolt to increase the length of the
mechanical lift spring which will decrease the amount of
force required to lift the mower deck.
• Adjust the eye-bolt to decrease the length of the
mechanical lift spring which will increase the amount of
force required to lift the mower deck.
OF1631
1
Decreased Spring Length = Increased Force
1. Eye-Bolt
Removing the Mower Deck
NOTE: Only remove PTO belt from electric clutch.
1. Remove PTO belt from electric clutch (see Replacing
Mower Belts on page 20).
NOTE: Perform steps 2 and 3 for mechanical lift mower
decks only (991009, 010, 011, 013, 015, 016, 017, 018, 019,
020).
CAUTION: Use care when releasing mechanical lift
spring tension. Keep body parts well away from
springs when performing this operation.
2. Raise mower deck to transport position (see Mower Lift
Pedal (991009, 010, 011, 013, 015, 016, 017, 018,
019, 020) on page 11).
3. Remove mechanical lift spring from each side of unit
(Figure 20).
OF3590
GB - 21
Increased Spring Length = Decreased Force
2
2. Mechanical Lift Spring
Figure 19
OF4040