Textron Jacobsen PGM Serie Manuel Technique page 18

7 ADJUSTMENTS
7 ADJUSTMENTS
7.1 GENERAL________________________________________________________________
!
WARNING
Before you adjust, clean or repair this equipment,
always disengage all drives, engage parking brake
and stop engine to prevent serious injury.
Whenever performing
carburetor adjustments, remove the spark plug wire
and place the wire away from the plug to prevent
accidental starting and bodily injury.
1. Adjustments and maintenance should always be
performed by a qualified technician. If proper
adjustment cannot be made, contact an authorized
Jacobsen.
7.2 REEL TO BEDKNIFE _______________________________________________________
(Pre-adjustment Check)
1. Check the reel bearings for end play or radial play. If
there is any abnormal movement of the reel, up and
down or side to side, adjust or replace components
as needed.
!
CAUTION
To prevent personal injury and damage to the cutting
edges, handle the reel with extreme care.
2. Inspect the reel blades and bedknife to insure good
sharp edges without bends or nicks.
a. The cutting edges of the reel blades and
bedknife must be sharp, free of burrs and show
no signs of rounding off.
b. The bedknife and bedknife backing must be
securely tightened. The bedknife must be
straight and sharp.
c. A flat surface of 1/32 (0.8 mm) minimum must be
maintained on the front face of the bedknife. Use
a standard flat file to dress the bedknife.
3. If wear or damage is beyond the point where the
reel or bedknife can be corrected by the lapping
process, they must be reground.
4. Proper reel-to-bedknife adjustment is critical. A gap
of 0.001 to 0.003" (0.025 to 0.076 mm) must be
maintained across the entire length of the reel and
bedknife.
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maintenance other than
2. Replace, do not
components.
3. Long hair, jewelry or loose fitting clothing may get
tangled in moving parts.
!
CAUTION
Be careful to prevent entrapment of the hands and
fingers between moving and fixed components of the
machine.
4. Do not change governor settings or overspeed the
engine.
5. The reel must be parallel to the bedknife. An
improperly adjusted reel will lose its sharp edges
prematurely and may result in serious damage to
the reel and bedknife.
6. Grass conditions will also affect the adjustment.
a. Dry, sparse conditions will require a wider gap to
prevent heat buildup and damage to the reel and
bedknife.
b. High quality grass with a good moisture content
requires a closer gap (near zero).
adjust, worn or damaged
1/32"
(0.8 mm)
90°
Figure 7A