Service And Adjustments - Gravely 890012 Owner/Operator And Parts Manual

WARNING: AVOID INJURY. Read and
understand Maintenance and Service Safety
Rules before attempting any maintenance.
REPLACING MOWER BELTS
NOTE: Long belt must be removed to remove short
belt.
1. Roll long belt off left blade spindle and remove from
deck.
2. Roll short belt off right blade spindle and remove
from deck. Idler pivot bolt must be loosened slightly
to gain clearance to remove belt from under idler
pulley (Figure 8).
CAUTION: Use care when releasing idler
spring tension. Keep body parts well away
from idlers when performing this operation.
3. Arrange new mower belt(s) on deck (short belt
first). Retighten short belt idler pivot bolt. Install
belts on sheaves. Roll belts onto blade sheave last.
4. Replace belt covers and return foot board to closed
position.
3
1
1. Long Mower Belt
2. Short Mower Belt
3. Springs
MOWER BLADES
NOTE: If mower is used under sandy soil conditions,
replace blades when air lifts become eroded through at
ends (Figure 10).

SERVICE AND ADJUSTMENTS

2
4
5
4. Idlers
5. Mower Clutch
Sheave
Figure 9
2
3
1. Cutting Blade
2. Square Corner
Sharpen the Mower Blades
CAUTION: Use sturdy gloves or padding to
protect hands when working with mower
blades.
1. Turn the engine off. Remove the ignition key.
Remove the ignition wire from the spark plugs.
2. Remove the bolts, lock washer, the flat washers,
and the blades from the spindle shafts.
3. Sharpen the beveled edges of the blades in a
straight line. Do not change the angle of the
beveled edge. If more than 0.5 inches (12.7mm)
are removed from the width of a blade, discard the
blade. Make sure the sharpened blades are
balanced. Balance must be held within 1.3 inch
ounces.
4. Put the blades, the flat washers, lock washers, and
the bolts back on the spindle shafts.
5. Tighten the bolts to a torque of 70 ft. lbs.
6. Put the ignition wires back on the spark plugs.
ADJUSTING ANTI-SCALP ROLLERS
The anti-scalp rollers are set at the factory for typical
mowing height, but can be adjusted for high or low
cutting conditions.
Rollers are intended to prevent lawn scalping, not to
control cutting height.
For a very high cutting height, set the rollers in their
lowest position on the bracket (Figure 11).
For a very low cutting height, set the rollers in their
OF1641
highest position on the bracket.
All rollers should be set at the same height.
11
1
4
3. Air Lift Erosion
4. Air Lift
Figure 10
OT0791