Bedknife Adjustment; Cutting Height - Jacobsen LF 3800 Parts And Maintenance Manual

3 ADJUSTMENTS
3.3

BEDKNIFE ADJUSTMENT ___________________________________________________

Read Section 3.2 before making the adjustment.
To prevent personal injury and damage to the cutting
edges, handle the reel with extreme care
Start adjustment at leading end of reel, followed by the
trailing end. The leading end of the reel blade is that end
which passes over the bedknife first during normal reel
rotation. (B-Figure 3B)
1. Set leading edge of reel. On 7" reels use adjuster
set the bedknife-to-reel gap. Screw adjuster down
(clockwise) to reduce gap.
On 5" reels use adjusters (C, D) to adjust gap. Loosen
bottom screw and turn top screw down to reduce gap.
2. Slide a feeler gauge or shim stock - 0.001" to 0.003"
(0.025 to 0.076 mm) - between the reel blade and the
(B) . Do not turn the reel.
bedknife
3. Adjust the trailing end of the reel in the same manner
then recheck the adjustment at the leading end.
4. When the reel is properly adjusted to the bedknife, 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° to the bedknife.
3.4

CUTTING HEIGHT _________________________________________________________

Note: Always make the reel-to-bedknife adjustment before
adjusting height of cut, Section 3.2 and 3.3.
1. Raise mowers to transport position then engage the
parking brake, stop engine and remove key from igni-
tion switch.
2. Set desired cutting height on the gauge
a. Measure distance between underside of screw
head and gauge block surface (
b. Adjust screw
tighten the wing nut.
3. Loosen the hardware on the front roller brackets (E)
just enough to allow the adjuster to raise or lower the
roller.
4. Place gauge (I) across bottom of front and rear rollers
near one end of roller.
5. Slide the head of gauge screw over the bedknife (G)
and adjust the hand knob (H) to close the gap between
the screwhead and bedknife.
GB-10
!
CAUTION
(I) .
J) .
(F) to obtain desired height then
Note: Avoid excessive tightening or damage may occur
to bedknife and reel blades. Reels must turn freely.
(A) , to
Tighten locknut (E). Repeat Steps 4 and 5 on opposite
end. Complete adjustment to one end before adjusting
opposite end.
6. Tighten hardware and recheck each end.
H
E
I
B
D
B
F
J
A
LF007
C
LF008
Figure 3C
G
LF009
Figure 3D