Bedknife-To-Reel; Bedknife Adjustment; Cutting Height - Jacobsen super lf 1880 Dealer's Manual

5.11 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 Section 5.14.
!
To prevent personal injury and damage to the cutting edges, wear
gloves and handle the reel and bedknife with extreme care.
2. Inspect the reel blades and bedknife to insure good sharp edges
without bends or nicks.
a. The leading edge of the reel blades (A) must be sharp, free of
burrs, and show no signs of rounding off.
b. The bedknife and bedknife backing must be securely tight-
ened. 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 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.

5.12 BEDKNIFE ADJUSTMENT ___________________________________________________________________

1. Read Section 5.11 before making the adjustment.
2. Start adjustment at the leading end of the reel, followed by the
trailing end. The leading end of the reel blades is that end which
passes over the bedknife first during normal reel rotation.
Use adjusters (B and C), to adjust gap. Loosen bottom adjuster
3.
(C) and turn top adjuster (B) down (Clockwise) to close gap.
a. Slide a feeler gauge or shim stock 0.001" - 0.003" (0.025 -
0.075 mm) between the reel blade and the bedknife. Do not
turn the reel.
b. Adjust the trailing end of the reel to the same gap in a
similar manner then recheck the adjustment at the leading
end.
c. 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.

5.13 CUTTING HEIGHT__________________________________________________________________________

Note: Always make the reel to bedknife adjustment before adjusting
CAUTION
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).
A
C
Note: Avoid excessive tightening or serious damage may result to
bedknife and reel blades. Reels must turn freely.
height of cut. (Sections 5.11 and 5.12).
ADJUSTMENTS 5
1/16 in.
(1.5 mm)
Figure 5J
LF025
Figure 5K
B
GKV-1
Figure 5L
17