Reel To Bedknife; Reel To Bedknife Adjustment - Jacobsen LF 3810 Dealer's Manual

4.15 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.
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 1/16 in. (2 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.

4.16 REEL TO BEDKNIFE ADJUSTMENT __________________________________________

Read Section 4.15 before making the adjustment.
CAUTION: To prevent personal injury and
!
damage to the cutting edges, handle the reel
with extreme care.
Start adjustment at the leading edge of the reel, followed by
the trailing end. The leading end of the blade is the end that
passes over the bedknife first during normal rotation.
1. Loosen nut (C) 1/4 turn on both ends of the cutting
unit.
a. Turn adjuster (A) in 1/16 to 1/8 turn increments.
b. Slide a feeler gauge or shim stock.001 in. (.025
mm) between the reel blade and the bedknife.
Do not turn reel.
c. Adjust the trailing end of the reel in the same
manner then recheck the adjustment at the
leading end.
d. Securely tighten all hardware and recheck the
adjustment.
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).
Leading
Edge of Reel
e. When properly adjusted, the reel will spin freely
and you should be able to cut a piece of
newspaper, along the full length of the reel, when
the paper is held at 90°.
Note: Avoid Excessive tightening or damage may occur to
bedknife and reel blades. Reel must turn freely.
ADJUSTMENTS
1/16 in.
Figure 4N
Normal
Rotation
Figure 4O
A
Figure 4P
4
C
19