Gravely Promaster 266 - Page 25

GB - 25
Check Blade Level and Pitch
1. Raise mower deck to a 3 in. (7.62 cm)
cutting height.
2. Shut off engine. Engage parking brake.
Remove the ignition key.
NOTE: Place blocks under the bottom edge
of the deck, not under the reinforcement bar
welded along deck face.
3. Place blocks at each corner of the deck
to support the weight of the deck.
4. Turn the blades so the blade ends point
left to right across the width of the deck.
5. Measure the distance between the
ground and cutting edge of the blade on
the left blade (Left position in figure 17)
and on the right blade (Right position in
figure 17). Distances should be within
3/16 in. (4.7 mm). If they are not, raise
the low side of the deck using the height
adjusters on the deck lift brackets (see
figure 18).
6. After deck is level side to side, check the
deck front to back pitch.
7. Turn the blades so the blade ends point
front to back as shown in figure 17.
8. Measure the distance between the
ground and the cutting edge of the
middle blade at the front of the deck
(Front position in figure 17) and between
the ground the cutting edge of the left
and right blades at the rear of the deck
(Rear position in figure 17).
9. The cutting edge at the front of the deck
(Front position in figure 17) should be
1/8 in. (3.18 mm) lower than the cutting
edges at the rear of the deck (Rear
position in figure 17).
10. If measurements are out of range, raise
the low side of the deck using the height
adjusters on the deck lift brackets (see
figure 18). Be sure to raise the deck
evenly to keep the deck level side to
side.
NOTE: Pitching the front of the blades lower
than the rear provides a balance between cut
quality and the power needed to cut grass.
Certain cutting conditions require the deck to
be pitched with the rear of the blades lower
than the front. Heeling the deck this way
requires more engine power but can provide
better cut quality.
11. Remove the blocks from under the deck.
Adjust Blade Height
Level and pitch the mower with the height
adjusters on each deck lift bracket (figure 18).
Loosen the jam nut on the deck lift
bracket bolt about 1/4 turn to reduce
clamp load on the height adjusters.
Loosen the jam nut on the deck adjuster
bolt and then turn the bolt clockwise to
raise the deck or counterclockwise to
lower the deck. Tighten both jam nuts.
Figure 17
Blade Side-to-Side Level
Blade Front-to-Back Pitch
Left
Right
Front
Rear
Rear
Figure 18
DO NOT place blocks
under reinforcement bar.
Height Adjusters
NOTE: On diesel units, height
adjusters are on the opposite
side of the rear arms.