Bedknife-To-Reel; Bedknife Adjustment - Jacobsen LF550-H-T4F Safety, Operation And Maintenance Manual

10 ADJUSTMENTS

10.7 BEDKNIFE-TO-REEL _______________________________________________________

1. Check the reel bearings for end play or radial play.
2. Inspect the reel blades and the bedknife to make sure
of good sharp edges without bends or surface
damage.
a The leading edge of the reel blades must be sharp,
without rough edges and show no indications of
become blunt.
b The bedknife and the bedknife backing must be
correctly tightened. The bedknife must be straight and
sharp.
c A flat surface of at least a minimum of 1/16 in. (0.15
cm) must be on the front face of the bedknife. Use a
standard flat file to prepare the bedknife.
3. If backlapping can not correct wear or damage to the
reel or bedknife, use a grinder to correct the surfaces.
4. Correct reel-to-bedknife adjustment is very important. A gap of 0.001 to 0.003 in. (0.0025 to 0.0076 cm) must be
kept across the full length of the reel and bedknife.
5. The reel must be parallel to the bedknife. An incorrectly adjusted reel will lose its sharp edges and can cause
damage to the reel and bedknife.
6. Grass conditions can change the adjustment.
a Dry conditions will need a wider gap to prevent temperature increase and damage to the reel and bedknife.
b High quality grass with a good moisture amount will need a closer gap (near zero).

10.8 BEDKNIFE ADJUSTMENT __________________________________________________

1. Read Section 10.7 before you adjust the reel.
2. Start the adjustment at the leading end of the reel,
followed by the trailing end. The leading end of the
reel blades is that end which moves over the bedknife
first during normal reel rotation.
3. Use the adjusters, to adjust the gap. Rotate the
adjusters to the right side to close the gap. Each click
of the adjuster moves the bedknife 0.001 in. (0.0025
cm) closer to the reel.
a Put a 0.001 - 0.003 in. (0.0025 - 0.0075 cm) feeler
gauge or shim 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
same method then inspect the adjustment at the
leading end.
c When the reel is correctly adjusted to the bedknife,
the reel will rotate freely. When a piece of newspaper
is held at 90° to an adjusted bedknife, you can cut a
piece of newspaper, along the full length of the reel.
NOTICE
Avoid excessive tightening or serious damage may
result to bedknife and reel blades. Reels must turn
freely.
69
Leading
Edge
LF570
Reel
LF550
Adjuster
Reel
Leading
Edge
1/16 in.
Bedknife
(0.15 cm)
Adjuster
Adjuster