Gravely Pro-Master 252 Owner's/Operator's Manual page 27

5. Measure the distance between the
ground and cutting edge of the blade on
the left blade (Left position in figure 19)
and on the right blade (Right position in
figure 19). 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
(Figure 20).
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 19.
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 19) and between
the ground the cutting edge of the left
and right blades at the rear of the deck
(Rear position in figure 19).
9. The cutting edge at the front of the deck
(Front position in figure 19) should be
1/8 in. (3.18 mm) lower than the cutting
edges at the rear of the deck (Rear
position in figure 19).
10. If measurements are out of range, raise
the low side of the deck using the height
adjusters on the deck lift brackets
(Figure 20). Be sure to raise the deck
evenly to keep the deck level side to
side.
Blade Side-to-Side Level
Left
Blade Front-to-Back Pitch
Front
Rear
Figure 19
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. (see
Check Blade Level and Pitch on page 26)
Right
NOTE: On diesel units, height
adjusters are on the opposite
side of the rear arms.
MOWER DRIVE BELT AND PTO
BELT ACCESS
Rear
GB - 27
Loosen the jam nut on the deck lift
bracket bolt about quarter turn to reduce
clamp load on the height adjusters.
(Figure 20)
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.
Height Adjusters
Figure 20
1. Lower the mower deck.
2. Place seat in most rearward position.
3. Place foot board in open position
(Figure 21).
4. Secure raised footboard with latch.