9 ADJUSTMENTS
36
9
ADJUSTMENTS
9.1 GENERAL ________________________________________________________________
1.
Adjustments and maintenance should always be
performed by a qualified technician. If proper
adjustment cannot be made, contact an authorized
Jacobsen Dealer.
2.
Replace,
do not adjust
, worn or damaged
components.
3.
Long hair, jewelry, or loose fitting clothing may get
tangled in moving parts.
4.
Do not change governor settings or overspeed the
engine.
9.2
BEDKNIFE-TO-REEL _______________________________________________________
(Pre-adjustment Check)
1.
Check the reel bearings for end play or radial play.
There should be no end play or radial play. See
.
2.
Inspect the reel blades and bedknife to insure good
sharp edges without bends or nicks.
a.
The leading edge of the reel blades
(B)
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 at least 1/16 in. (1.5 mm) minimum
must be maintained on the front face of the bed-
knife. 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 in. (0.025 to 0.076 mm) must be
maintained across the entire length of the reel and
bedknife.
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).
Figure 9A
Figure 9B
WARNING
To prevent injury, lower implements to the ground,
disengage all drives, engage parking brake, stop
engine and remove key from ignition switch before
making any adjustments or performing maintenance.
Make sure the mower is parked on a solid and level
surface. Never work on a mower that is supported
only by a jack. Always use jack stands.
If only the front or rear of the mower is raised, place
chocks in front of and behind the wheels that are not
raised.
!
CAUTION
Be careful to prevent entrapment of the hands and
fingers between moving and fixed components of the
machine.
!
1/16 in.
(1.5 mm )
B
