CUTTING UNITS
673831-Rev A 8-29
8
Bedknife Adjustment Assembly
Disassembly
See Figure 8-22.
1. Park the mower safely. (See “Park Mower Safely” on
page 1-6.)
2. Remove cutting unit from mower. (See “Cutting Unit”
on page 8-22.)
3. Place cutting unit on a solid work surface.
4. Remove bedknife backing assembly. (See “Bedknife
Backing Assembly” on page 8-27.)
Figure 8-22
Bedknife adjustment rod (1) is threaded through internal
trunnion (2), located inside the reel frame weldment tube.
5. Turn bedknife adjustment rod (1) clockwise (as
viewed from front of cutting unit) enough to remove
preload from compression spring (4).
The bedknife adjustment gear (7) is press fit on the
bedknife adjustment rod (1). Removing jam nut (6) will
assist bedknife adjustment gear removal.
6. Hold bedknife adjustment rod (1) in position and
remove jam nut (6), bedknife adjustment gear (7),
Belleville washer (5) and compression spring (4)
7. Remove screw (8), lock washer (9) and cradle (3).
8. Remove bedknife adjustment rod (1) and internal
trunnion (2).
9. Repeat steps 5 through 8 for other side of cutting
unit.
Assembly
See Figure 8-23.
Figure 8-23
1. Install bedknife adjustment rod (1) and internal
trunnion (2). Make sure the smaller hole in trunnion
aligns with second hole in reel cross tube.
2. Adjust bedknife adjustment rod (1) to achieve an
initial distance (8) of 4.00 in. (101.6 mm) between
frame tube and threaded end of bedknife adjustment
rod.
3. Install cradle (3) with slot facing outside of reel, lock
washer (9) and screw (10).
4. Install compression spring (4) and engage spring leg
in slot on cradle.
The cupped side of the Belleville washer (5) should face
the compression spring (4) when installed.
5. Install Belleville washer (5).
6. Install jam nut (6).
7. While holding bedknife adjustment rod (1) to maintain
distance (8), adjust jam nut (6) until flat on shoulder
of bedknife adjustment rod is flush with face of jam
nut.
8. Turn bedknife adjustment rod (1) until compression
spring (4) is nearly collapsed.
Use the slotted nut, previously removed, and 5/16 in.
(8 mm) flat washers stacked to approximately 0.5 in.
(12.7 mm) to press the bedknife adjustment gear (7) on
the bedknife adjustment rod (1) during installation. (See
“Bedknife Backing Assembly” on page 8-27.)
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