Check Parking Brake - Gravely Pro-Turn 400 Series Operator's Manual

Sharpen Blades
CAUTION: DO NOT sharpen
blades while attached to unit.
1. Remove blades from unit. Discard blades
if:
• More than 1.3 cm (1/2") of metal is
removed.
• Air lifts are eroded.
• Blades are bent or broken.
2. File or grind an equal amount of metal
from each cutting edge of the blade until
sharp. DO NOT change angle of cutting
edge or round the corner of the blade.
See Figure 30.
DO NOT sharpen to this pattern.
2
Sharpen to this pattern.
3
DISCARD if more than
1.3 cm (1/2")
1. Cutting Edge
2. Square Corner
3. Air Lift Erosion
4. Air Lift
Figure 30
CAUTION: Unbalanced blades
cause excessive vibration and
eventual damage to unit.
Balance blades before
reinstalling on unit.
NEVER weld or straighten
blades.
1
1
4
EN - 27
3. Check blade balance by sliding an
unthreaded bolt through center hole. Hold
the bolt level. If blade does not remain
horizontal, sharpen the heavy end until
blade is balanced.
Install Blades
See Figure 29.
CAUTION: Mating surfaces
between spindle, lower spindle
guard, blade and washer MUST
be free of debris to ensure
correct tightness and alignment.
1. Secure lower spindle guards and blades
to spindles with one bevel washer and
hex bolt. Torque to 156 N•m – 217 N•m
(115 lb-ft – 160 lb-ft).
2. Reconnect spark plug wires.

CHECK PARKING BRAKE

IMPORTANT: Check brake on both sides of
unit.
1. Place unit in service position. See
Service Position on page 23.
See Figure 31.
2. Measure length of compression spring
and distance between the stop nut and
trunnion. Compression spring length
MUST be 3.8 cm (1 1/2") and the gap
between stop nut and trunnion MUST be
3.2 mm – 6.4 mm (1/8" – 1/4").
• If measurements are outside
specification, adjust parking brake. See
Adjust Parking Brake on page 33.
• If measurements are within
specification, no adjustment is needed.
Figure 31
3. Return unit to operating position.