Driveline Interference Check; Cutting Height Adjustment - Oregon 480RC Original Instruction Manual

Driveline Interference Check

1. Check for clearance between driveline and cutter deck.
2. Slowly lift cutter and observe driveline. If clearance
between driveline and cutter deck is less than 1 inch,
shorten top link or limit upper travel of lower hitch arms.
Refer to tractor operator's manual for instructions.

Cutting Height Adjustment

WARNING
• Keep all persons away from operator control
area while performing adjustments, service, or
maintenance.
• Avoid low cutting heights. Striking the ground with
blades produces one of the most damaging shock
loads a cutter can encounter. Allowing blades to
contact ground repeatedly will cause damage to
cutter and drive.
1. Level cutter from side to side. Check by measuring from
cutter frame to the ground at each side skid.
2. Adjust, using tractor 3-point arm leveling device.
NOTE: Keep the front of cutter slightly lower than rear for
best mowing.
Figure 8. Cutting Height Adjustment
3. Control cutting height with tractor 3-point arms, rear
tailwheel adjustment.
4. To raise rear of cutter, move tailwheel arm down.
5. To raise front of cutter, raise tractor 3-point arms.
The cutting height is the distance between the blade and
the ground. The blades are approximately 1.25" above the
side skid. To check cutting height, do the following:
a) Select a cutting height; as an example, for an
approximate cutting height of 3", set the side skid above
the ground:
3" Desired cutting height
- 1.25" Distance blade cutting edge is above side skid
_____
= 1.75"
b) Adjust the front-to-rear attitude from 1/2" to 3/4" higher
than the front.
6. Adjust top link to provide 1.2" of clearance between break
link and rear lift arms. See Figure 8. The clearance will
allow cutter to float over uneven terrain.
OPERATION
15